Rheem RTGH84XLP1, RTGH95DVLN2 User Manual

CERTIFIED

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WARNING:

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®

If the information in these
instructions is not followed
exactly, a fire or explosion may
result, causing death, personal
injury, or property damage.

For Your Safety!

• Do not store or use gasoline
or other flammable vapors and
liquids in the vicinity of this or
any other appliance. To do so
may result in an explosion or
fire.

• Installation and service must

be performed by a qualified
installer, service agency, or the
gas supplier.

What to Do If
You Smell Gas

• Do not try to light any
appliance.

• Do not touch any electrical
switch; do not use any
phone in your building.

• Immediately call your gas
supplier from a neighbor’s
phone. Follow the gas supplier’s
instructions.

• If you cannot reach your
gas supplier, call the fire
department.

• Do not return to your home until
authorized by the gas supplier
or fire department.

HIGH EFFICIENCY
CONDENSING TANKLESS
WATER HEATER

USE AND CARE MANUAL

With Installation Instructions
for the Installer

Condensing Direct Vent and Outdoor
199,900 Btu/hr, 180,000 Btu/hr,
157,000 Btu/hr and 120,000 Btu/hr Models

Do not destroy manual. Please read
carefully and keep in a safe place
for future reference.

WARNING:

This water heater is not suitable
for use in manufactured (mobile)
homes.

AP19300 (01/18)

CONTENTS

!

!

!

Important Safety Information

Safety Precautions ��������������������������������������������������������������������� 2–8

Product Information

Product Information ������������������������������������������������������������������������ 8

Specifications ��������������������������������������������������������������������������� 9, 10

General Descriptions ��������������������������������������������������������������� 11, 12

Safety

Using Your Water Heater

Setting the Water Temperature �������������������������������������������������13, 14

Caring for Your Water Heater

Water Heater Inspections ������������������������������������������������������� 15, 16

Care and Cleaning ������������������������������������������������������������������ 17, 18

Preventive Maintenance ��������������������������������������������������������������� 19

Draining the Water Heater ��������������������������������������������������������20–22

Freeze Protection ������������������������������������������������������������������������� 22

Vacation and Extended Shutdown ����������������������������������������������� 23

Troubleshooting Chart ������������������������������������������������������������ 23, 24

Service Error Code Chart ������������������������������������������������������� 25, 26

If You Need Service

Call for Assistance ������������������������������������������������������������������������ 26

Installation Instructions

Standards Compliance ������������������������������������������������������������������ 28
Choosing a Location �����������������������������������������������������������������28, 29
Product Inspection ������������������������������������������������������������������������� 30
Water Heater Installation ��������������������������������������������������������� 30–33
Venting ������������������������������������������������������������������������������������� 34–48
Water Quality/Supply ����������������������������������������������������������������49-53
Condensate ����������������������������������������������������������������������������������� 53
Gas Supply ������������������������������������������������������������������������������� 54-59
Electrical Wiring ������������������������������������������������������������������������ 59-63
Remote Control Installation �������������������������������������������������������62-63
Insulation Blankets ������������������������������������������������������������������������ 64
Installation Checklist ���������������������������������������������������������������������� 65
Piping for Space Heaters �������������������������������������������������������������� 66
Recirculation Control ���������������������������������������������������������������� 67-69
Activating the Water Heater ������������������������������������������������������ 70-71
Setting the Water Temperature ��������������������������������������������������72-74
High-Altitude Dip Switch Adjustments �������������������������������������� 74-76
Water Saving Control Option ����������������������������������������������������77-78
Maintenance Notice Option ������������������������������������������������������ 79-80
Parts Replacement ������������������������������������������������������������������� 81-82
Warranty Information�����������������������������������������������������������������83-84

IMPORTANT SAFETY INFORMATION

READ THE SAFETY INFORMATION

Your safety and the safety of others are very important. There
are many important safety messages in this manual and on
your appliance. Always read and obey all safety messages.

This is the safety alert symbol. Recognize this
symbol as an indication of Important Safety
Information! This symbol alerts you to potential
hazards that can kill or hurt you and others.

All safety messages will follow the safety alert symbol
and either the word “DANGER,” “WARNING,” “CAUTION,”
or “NOTICE.”

These words mean:

DANGER:

WARNING:

CAUTION:

An imminently hazardous
situation that will result in
death or serious injury.

A potentially hazardous
situation that can result in
death or serious injury and/or
damage to property.

A potentially hazardous
situation that may result in
minor or moderate injury.

WARNINGS:

• This water heater is not approved for use in
manufactured (mobile) homes!

• Improper installation, adjustment, alteration, service,
or maintenance can cause death, personal injury, or
property damage. Follow the instructions in this manual.

READ ALL INSTRUCTIONS
BEFORE USING.

Be sure to read and understand the entire Use and Care Manual
before attempting to install or operate this water heater. It
may save you time and money. Pay particular attention to the
Safety Instructions. Failure to follow these warnings could result
in death or serious bodily injury. Should you have problems
understanding the instructions in this manual, or have any
questions, STOP and get help from a qualified service technician
or the local gas utility.

WARNING:

California Proposition 65

This product contains chemicals known to the state of California
to cause cancer, birth defects, or other reproductive harm.

NOTICE:

Attention is called to observe a
specified procedure or maintain
a specific condition.

2

IMPORTANT SAFETY INFORMATION

Water Heater Venting Safety

DANGER:

• Failure to install and properly vent the water heater to
the outdoors as outlined in the “Venting” section of the
Installation Instructions in this manual will result in
death from fire, explosion, or asphyxiation from carbon
monoxide. NEVER operate this water heater unless it is
properly vented and has the air supply piping properly
installed and terminated to the outdoors.

• Be sure to inspect the vent terminal, the air intake,
and the vent system on the water heater for proper
installation at initial start-up and at least annually
thereafter. Refer to the “Care and Cleaning” section
of this manual for more information regarding vent
system inspection.

WARNINGS:

• Gasoline and other flammable liquids, materials,

and vapors (including paint thinners, solvents,
and adhesives) are extremely dangerous. DO NOT
handle, use, or store gasoline or other flammable or
combustible materials anywhere in the vicinity of a
water heater or any other appliance. Be sure to read
and follow the labels on the water heater, as well as the
warnings printed in this manual. Failure to do so can
result in death, bodily injury, or property damage.

• Combustible construction refers to adjacent walls and

ceilings and should not be confused with combustible
or flammable products and materials. Combustible
materials, such as clothing, cleaning materials, or
flammable liquids, should never be stored in the vicinity
of this or any gas appliance. Fire or explosion can occur
causing death, personal injury, and/or property damage.
See page 29 for clearances to combustible materials.

• Follow vent manufacturer’s instructions for venting

installation, including additional clearances from
combustibles, to avoid conditions that can lead to
death, personal injury, and/or property damage.

• Use tankless water heater manufacturer-approved

Schedule 40 PVC (foam core is not permitted at any
time), Schedule 80 PVC, CPVC, ABS, UL 1738-listed
Category III Stainless Steel, or InnoFlue® PP. No other
vent material is permitted. For Canada, installations
must follow ULC S636 for exhaust venting.

• Moisture in the flue gas will condense as it leaves the

vent terminal. In cold weather this condensate can
freeze on the exterior wall, under the eaves, and on
surrounding objects. Some discoloration to the exterior
of the building is to be expected. However, improper
location or installation may result in severe damage to
the structure or exterior finish of the building.

• For multiple-unit installation, a minimum distance
between vent terminations must be maintained to
prevent recirculation of vent gases. See page 39 for
information on venting and clearances to multiple
terminations.

DANGER

FLAMMABLES

Vapors from flammable
liquids will explode and
catch fire causing death or
severe burns.

Do not use or store flammable
products such as gasoline,
solvents or adhesives in the
same room or area near the
water heater.

Keep flammable products:

1. far away from heater,

2. in approved containers,

3. tightly closed and

4. out of children's reach.

Installation:
Do not install water heater
where flammable products will
be stored or used unless the
main burner flame is at least

Read and follow water heater warnings and instructions. If
owners manual is missing, contact the retailer or manufacturer.

Flammable Vapors

Water heater has a main
burner flame.
The main burner flame:

1. which can come on
at any time and

2. will ignite flammable
vapors.

Vapors:

1. cannot be seen,

2. are heavier than air,

3. go a long way on the
floor and

4. can be carried from
other rooms to the
main burner flame by
air currents.

18" above the floor. This will
reduce, but not eliminate, the
risk of vapors being ignited
by the main burner flame.

CAUTIONS:

• Ensure that the appliance vent is securely glued and
attached to the vent connection on the top of the water
heater. DO NOT USE SCREWS.

• DO NOT operate without the condensate drain connected
and routed to a proper drain.

Safety

3

IMPORTANT SAFETY INFORMATION

!

!

Water Supply Safety

DANGERS:

• WATER TEMPERATURE SETTINGS

Safety

– Safety and energy conservation
are factors to be considered when
selecting the water temperature
setting of a water heater’s remote
control. Water temperatures above
125°F (52°C) can cause death
or severe burns from scalding.
Be sure to read and follow the
warnings outlined on the pictured
label.

• There is a hot water scald potential
if the water temperature is set
too high. Households with small
children, the disabled, or elderly
persons may require a 120°F
(49°C) or lower temperature setting
to prevent contact with “HOT”
water.

• Before manually operating the
relief valve, make certain no one
will be exposed to the danger
of the hot water released by
the valve. The water may be hot
enough to create a scald hazard.
The water should be released into
a suitable drain to prevent injury or
property damage.

• Failure to perform the recommended Routine Preventive
Maintenance can harm the proper operation of this
water heater, which can cause carbon monoxide
dangers, excessive hot water temperatures, and other
potentially hazardous conditions.

!

Water temperature over 125°F (52°C)
can cause severe burns instantly or
death from scalds.

Children, disabled and elderly are
at highest risk of being scalded.

See instruction manual before
setting temperature at water
heater.

Feel water before bathing or
showering.

Temperature limiting valves are
available, see manual.

WARNINGS:

• IMPORTANT: DO NOT apply heat to the HOT or COLD
water connections. If sweat connections are used,
sweat tubing to adapter before fitting adapter to the
water connections on heater. Any heat applied to the
water supply fittings will permanently damage the
internal components of the water heater.

• In case the pipe insulation is not rated for the
appropriate weather conditions, install electric heat
tracing or equivalent to prevent freezing of the pipes.
DO NOT insulate or block the drain valve on the hot
outlet fitting. If the pipes are allowed to freeze, the
water heater and the pipes may malfunction or leak due
to freezing water.

• Failure to drain the water heater as described on
"Draining the Water Heater" can cause serious personal
injuries from scalding and/or damage the water heater.

D ANGER

HOT

BURN

qualified service personnel should perform this adjustment. Only
factory-authorized remote control(s) should be used.

Time/Temperature Relationship in Scalds

Water Temperature Time to Produce
a Serious Burn

120°F (49°C) More than 5 minutes
125°F (52°C) 1 1/2 to 2 minutes
130°F (54°C) About 30 seconds
135°F (57°C) About 10 seconds
140°F (60°C) Less than 5 seconds
145°F (63°C) Less than 3 seconds
150°F (66°C) About 1 1/2 seconds
155°F (68°C) About 1 second

Table courtesy of Shriners Burn Institute

Temperature Conversion Chart °F/°C

85 100 102 104 106 108 110 112 114 116 118 120 125 130 140 °F
29 38 39 40 41 42 43 44 46 47 48 49 52 54 60 °C

CAUTIONS:

• This water heater must only be used
with the following water supply system
conditions:

– With clean, potable water free of corrosive

chemicals, sand, dirt, or other contaminants.

– With inlet water temperatures above 32°F

(0°C), but not exceeding 120°F (49°C).

– DO NOT reverse the hot and cold water

connections. The water heater will not operate.

• Even when drained properly, a small
amount of water will remain in the water
heater. In cold weather conditions, this
water can freeze. If this happens, allow
the defrost protection on the heater
at least 30 minutes to melt the frozen
water or the water heater may not work
properly.

NOTICE:

The factory setting allows operating
temperatures between 100°F (38°C) and 120°F
(49°C). Temperatures of 85°F (29°C) and up to
140°F (60°C) can be achieved with the MAIN
(UMC-117) remote control. Temperatures of
85°F (29°C) can be achieved with the Bath
(USC-117 or USC2-117) remote control. Only

4

IMPORTANT SAFETY INFORMATION

Natural Gas and Liquefied Petroleum Safety

DANGERS:

• Never attempt to convert the water heater from natural
gas to LP or vice versa. The water heater must only use
the fuel type in accordance with listing on data plate—
natural gas for natural gas units and LP for LP units.
Any other fuel usage will result in death or serious
personal injury from fire and/or explosion. This water
heater is not certified for any other fuel type.

• Both natural gas and propane (LP) have an odorant
added to aid in detecting a gas leak. Some people
may not physically be able to smell or recognize this
odorant. If you are unsure or unfamiliar with the
smell of natural gas or LP, ask the gas supplier. Other
conditions, such as “odorant fade,” which causes
the odorant to diminish in intensity, can also hide or
camouflage a gas leak.

• Water heaters using LP gas are different from natural
gas models. A natural gas water heater will not
function safely on LP and vice versa.

• LP must be used with great caution. It is heavier than
air and will collect first in lower areas, making it hard
to detect at nose level.

• Before attempting to light the water heater, make sure
to look and smell for gas leaks. Use a soapy solution
to check all gas fittings and connections. Bubbling at
a connection indicates a leak that must be corrected.
When smelling to detect a gas leak, be sure to also sniff
near the floor.

• Gas detectors are recommended in LP and natural
gas applications and their installation should be
in accordance with the detector manufacturer’s
recommendations and/or local laws, rules, regulations,
or customs.

• Combustible materials, such as clothing, solvents,
cleaning materials, or flammable liquids, must not be
placed in the vicinity of the water heater.

• If a gas leak is present or suspected:

– DO NOT attempt to find the cause yourself.

– Never use an open flame to test for gas leaks. The gas can

ignite resulting in death, personal injury, or property damage.

– Follow the steps listed under “What to Do If You Smell Gas”

found on the front cover of this manual.

WARNINGS:

• The installation of gas piping must comply with local
utility company requirements and/or in the absence of
local codes, use the latest edition of National Fuel Gas
Code (NFGC), ANSI Z223.1/NFPA 54, or CAN/CSA B149.1,
Natural Gas and Propane Installation Code.

• If inlet gas pressure is out of allowable range [4.0” w.c.
(1.0kPa) – 10.5” w.c. (2.6kPa)] for Natural Gas, or [8.0”
w.c. (2.0kPa) – 13.0” w.c. (3.2kPa)] for LP gas, a gas
pressure regulator must be installed to maintain the
allowable inlet gas pressure.

• Should overheating occur or the gas supply fail to shut
off, turn off the manual gas control valve to the water
heater.

CAUTIONS:

• DO NOT attempt repair of electrical wiring, gas piping,
remote control, burners, vent connectors, or other safety
devices. Refer repairs to qualified service personnel.

• Turn off the manual gas shut-off valve if the water
heater has been subjected to overheating, fire, flood,
physical damage, or if the gas supply fails to shut off.

• DO NOT turn on the water heater unless the water and
gas supplies are completely opened.

Safety

5

IMPORTANT SAFETY INFORMATION

Before operating this water heater, be sure to read and
follow the instructions on the label pictured below and all
other labels on the water heater, as well as the warnings
printed in this manual.

Failure to do so can result in unsafe operation of the water

Safety

heater, resulting in death, personal injury, or property
damage. Should you have any problems reading or
following the instructions in this manual, STOP and get help
from a qualified service technician.

FOR YOUR SAFETY READ BEFORE OPERATING

WARNING : If you do not follow these instructions exactly, a fire or explosion may result

causing property damage, personal injury or loss of life.

OPERATING INSTRUCTIONS

1.STOP! Read the safety information above on this label.

2.Turn off all electric power to the appliance.

3.DO NOT attempt to light the burner by hand.

4.Turn the Gas Shutoff Valve located on the outside of the unit
clockwise to the "OFF" position.

5.Wait five (5) minutes to clear out any gas. If you then smell gas, STOP! Follow "B" in
the safety information above on this label. If you don't smell gas, go to the next step.

6.Turn the Gas Shutoff Valve located on the outside of the unit counterclockwise to
the "ON" position.

7.Turn on all electric power to the appliance.

8.If the appliance will not operate, follow the instructions "To Turn Off Gas To Appliance"
and call your service technician or gas supplier.

GAS SHUTOFF

VALV E

OPEN CLOSE

TO TURN OFF GAS TO APPLIANCE

1.Turn off all electric power to the appliance if service is to be performed.
.

Turn the Gas Shutoff Valve located on the outside of the unit clockwise to the "OFF" position.

2

6

Electrical Safety

IMPORTANT SAFETY INFORMATION

DANGER:

• Shock Hazard – Make sure the electrical power to the
water heater is off to avoid electric shock that will
result in death or serious personal injury.

WARNINGS:

• For your safety, the information in this manual must
be followed to minimize the risk of fire, explosion, or
electric shock that can result in death, personal injury,
and/or property damage.

• Field wiring connections and electrical grounding must
comply with local codes or, in the absence of local
codes, with the latest edition of the National Electrical
Code, ANSI/NFPA 70, or in Canada, Canadian Electrical
Code, CAN/CSA C22.1, Part 1.

CAUTIONS:

• Label all wires prior to disconnecting for service. Wiring
errors can cause dangerous and improper operation.
Verify correct operation after servicing.

• For your safety, burner inspection and cleaning should
be performed only by qualified service personnel.

• Make certain the power to the water heater is OFF
before removing the unit cover panel. Exposed
electrical components and moving parts can cause
personal injuries.

• For your safety, DO NOT attempt repair of electrical
wiring, gas piping, remote control, burners, vent
connectors, or other safety devices. Refer repairs to
qualified service personnel.

FOR INSTALLATIONS IN THE STATE OF CALIFORNIA

California law requires that water heaters must be braced,
anchored, or strapped to resist falling or horizontal
displacement due to earthquake motions. For water heaters
up to 52-gallon capacity, a brochure with generic earthquake
bracing instructions can be obtained from: Office of the
State Architect, 1102 Q Street, Suite 5100, Sacramento, CA
95814, or you may call 916-445-8100 or ask a water heater
dealer.

However, applicable local codes shall govern installation.
For residential water heaters of a capacity greater than
52 gallons or tankless-style, consult the local building
jurisdiction code for acceptable bracing procedures.

Safety

7

IMPORTANT SAFETY INFORMATION

General Installation and Maintenance Safety

WARNINGS:

• This water heater must be installed in accordance
with these instructions, local codes, utility company
requirements and/or in the absence of local codes,
use the latest edition of the American National
Standard/National Fuel Gas Code (NFGC), ANSI Z223.1
and National Fire Protection Association, NFPA 54, or
in Canada, CAN/CSA B149.1, Natural Gas and Propane
Installation Code, and the latest edition of the
National Electrical Code, ANSI/NFPA 70, or in Canada,
Canadian Electrical Code, CAN/CSA C22.1, Part 1.

• For your safety, DO NOT attempt to disassemble this
water heater for any reason. Improper adjustments,
alterations, service, or maintenance can cause death,
personal injury, or property damage.

Product Information Safety

SAVE THESE INSTRUCTIONS

SAFETY PRECAUTIONS:

Read this manual entirely before installing and/or operating
the water heater.

Use this water heater only for its intended purpose as
described in this Use and Care Manual.

Have the installer show you the location of the gas shut-off
valve and how to shut it off if necessary. Turn off the manual
shut-off valve if the water heater has been subjected to
overheating, fire, flood, physical damage, or if the gas supply
fails to shut off.

Be sure your water heater is properly installed in accordance
with local codes and the provided installation instructions.

DO NOT attempt to repair or replace any part of your water
heater unless it is specifically recommended in this manual.
All other servicing should be referred to a qualified service
technician.

PRODUCT INFORMATION

For Your Records

Write down and save the following product information
along with the original sales slip and/or cancelled check.
The model and serial numbers can be found on the top
label on the right side of the water heater.

MODEL NUMBER:

SERIAL NUMBER:

DATE OF INSTALLATION:

INSTALLING COMPANY/PHONE NUMBER:

PLUMBING CONTRACTOR/PHONE NUMBER:

See page 26 for additional service information.

Read This Manual

Inside you will find many helpful hints on how to use and
maintain your water heater properly. A little preventive care on
your part can save you time and money over the life of your
water heater.

You’ll find many answers to common problems in the
"Troubleshooting Chart" on this Use and Care Manual. Always
refer to this chart before calling for service. Referring to this
chart before calling may answer your question(s) and eliminate
the need for service.

Preoperating Checklist

Is the main gas valve to the water heater turned on?

Is the fuse in place or is the breaker turned on?

Does the water heater’s electronic ignition light?

Is the water temperature set to a safe temperature?

Is the water heater connected to a floor drain?

Is the water heater properly vented to the outside?

Is the water heater installed in a safe location away
from flammable materials and/or freezing conditions?

8

PRODUCT INFORMATION

Specifications – Direct-Vent Models

33/8"

(86 mm)

1

/4"

6

(159 mm)

1

/2"

5

(140 mm)

177/8"

(454 mm)

29 1/4"

(743 mm)

275/8"

(702 mm)

21/8"

(54 mm)

7

/8"

2

(73 mm)

(140 mm)

7

/8"

3

(98 mm)

51/2"

4

(105 mm)

Specifications – Outdoor Models

185/8"

Product Information

(473 mm)

1

2

/4"

(59 mm)

1

/8"

93/4"

(248 mm)

1

/2"

1

(38 mm)

91/2"

(241 mm)

177/8"

(454 mm)

1

/8"

6

(156 mm)

275/8"

(702 mm)

21/8"

(54 mm)

(73 mm)

3

(98 mm)27/8"

51/2"

(140 mm)

7

/8"

(105 mm)

185/8"

(473 mm)

1

/4"

2

(59 mm)

1

4

/8"

93/4"

(248 mm)

1

/2"

1

(38 mm)

91/2"

(241 mm)

1

/8"

6

(156 mm)

9

PRODUCT INFORMATION

Specifications

The following product informa­tion can be found from the rating
label on this water heater.

A. Model Number
B. Serial Number
C. Data Bar Code
D. Heater Type
E. Installation Type
F. Type of Gas
G. Max. Inlet Gas Pressure
H. Min. Inlet Gas Pressure
J. Recovery Rating
K. Max. BTU Input Rating

Product Information

L. Min. BTU Input Rating
M. Manifold Gas Pressure
N. Certification Stamp
P. Alternate Approval Stamp
Q. Clearances

English Rating Label

English/French Rating Label

10

General Descriptions

Typical Direct-Vent Water Heater

PRODUCT INFORMATION

(Shown Without Venting)

Remote Control

With Power Switch

Product Information

To Hot Water

Faucet(s)

Condensate

Drain Valve

Pipe*

Powe r

Supply

Cord

Union

To Suitable

Drain

Water

Filter

Relief
Relief

Valve
Valve

Service

Valve

Cold Water Supply

Shut-Off Valve

To Suitable

Drain

*Note: A flexible drain tube can be used

Manual Gas

Shut-Off Valve

(Supplied)

Union

Sediment Trap

Cap

Manual Gas

Supply Line

Shut-Off Valve

11

PRODUCT INFORMATION

Typical Outdoor Water Heater

(No Venting Required)

This water heater is for OUTDOOR installation only.

DANGER:

DO NOT install this water heater indoors or in a confined space. It is designed for outdoor installation only. Any other type of
installation will result in death or serious personal injury.

Flue

Terminal

Product Information

Hard-Wire

To Hot Water

Faucet(s)

Condensate

Pipe*

Power

Supply

Cord

Union

Relief
Relief

Valve
Valve

Service

Valve

Water

Filter

Manual Gas

Shut-O Valve

Union

(Supplied)

Sediment Trap

Remote Control

With Power Switch

Manual Gas
Supply Line

Shut-O Valve

12

Drain Valve

To Suitable

Drain

Cold Water Supply

Shut-O Valve

To Suitable

Drain

*Note: A exible drain tube can be used

Cap

Safety Precautions

USING YOUR WATER HEATER

WARNING:

• Flammable vapors can be drawn by air currents
from surrounding areas to the water heater. Vapors
can ignite causing death, personal injury, or product
damage.

• DO NOT store or use flammable or combustible
materials (gasoline, paint thinner, adhesives,
solvents, newspapers, rags, mops, etc.) in the
vicinity of the water heater or any other gas
appliance. If they must be used, open doors and
windows for ventilation, and shut off all gas­burning appliances, including their pilot lights.

• DO turn off manual gas shut-off valve if water
heater has been subjected to overheating, fire, flood,
physical damage, or if the gas supply fails to shut
off.

• DO NOT turn on water heater unless water and gas
supplies are completely opened.

• DO NOT turn on water heater if cold water supply
shut-off valve is closed.

• If there is any difficulty in understanding or
following the operating and care instructions in
this manual, it is recommended that you contact a
qualified service technician to perform the work.

Setting the Water Temperature

DANGER:

Water temperatures above 125°F (52°C) will result in death and/or
severe burns from scalding.

Safety and energy conservation are factors to be considered when
selecting the water temperature setting. The temperature of the water in
the water heater can be regulated by setting the temperature on the front
of the remote control. Be sure to read and follow the warnings outlined on
the pictured label.

The recommended setting for the water temperature is 100°F (38°C).
The remote control has been preset and shipped at the recommended
temperature setting.

Safety factors should be considered whenever altering the water
temperature setting. The chart below may be used as a guide in
determining the proper water temperature for your home.

!

D ANGER

Use Instructions

HOT

BURN

Time/Temperature Relationship in Scalds

Water Temperature Time to Produce a Serious Burn

120°F (49°C) More than 5 minutes
125°F (52°C) 1 1/2 to 2 minutes
130°F (54°C) About 30 seconds
135°F (57°C) About 10 seconds
140°F (60°C) Less than 5 seconds
145°F (63°C) Less than 3 seconds
150°F (66°C) About 1 1/2 seconds
155°F (68°C) About 1 second

Table courtesy of Shriners Burn Institute

Water temperature over 125°F (52°C)
can cause severe burns instantly or
death from scalds.

Children, disabled and elderly are
at highest risk of being scalded.

See instruction manual before
setting temperature at water
heater.

Feel water before bathing or
showering.

Temperature limiting valves are
available, see manual.

13

USING YOUR WATER HEATER

Setting the Water Temperature (cont.)

Maximum water temperature occurs while the water
heater burner is ON. To determine the water temperature:

Turn on the hot water faucet and place a thermometer
in the water stream.

NOTICE:

Water temperature at the faucet may vary depending on the
season and the length of pipe from the water heater.

The remote control temperature range is between 100°F
(38°C) and 120°F (49°C). To adjust the temperature to
a desired setting, press the UP or DOWN adjustment
button on the face of the remote control. The new
temperature set point will show on the LED display.

In-Use Indicator

(Lit during operation)

Use Instructions

Priority

Indicator

Temperature

Adjustment

Buttons

NOTICE:

The temperature set point on the standard remote control
cannot be increased above 112°F (44°C) when a hot water
faucet is in the open position. To achieve temperatures
above 120°F (49°C) or 85°F (29°C), contact a qualified
service technician. Only factory-authorized remote control(s)
should be used.

The water heater may not operate with a small water
flow. Increase the water flow and recheck. If it still does
not operate with the hot water faucet completely open,
increase the temperature setting on the remote control.

Water Heater Facts

DANGER:

Water temperatures above 125°F (52°C) will result in death
and/or severe burns from scalding.

• The hottest temperature water will be at the faucet
closest to the water heater.

• Always remember to test the water temperature
with your hand before use.

• Always supervise young children or others who are
incapacitated.

• The water heater is equipped with a device that will
shut off the gas supply to the burner if the water
heater exceeds normal operating temperatures.

• Any water heater that has been subjected to fire,
flood, physical damage, or been under water should
be turned off at the manual gas shut-off valve and
not used until it has been checked by qualified
service personnel.

14

LED Temperature

and Error Code

Display

Power On/Off

Button and

Indicator

CARING FOR YOUR WATER HEATER

Condensate Drain

Water Heater Inspections

Venting System (Direct Vent Only)

The venting system should be inspected annually to
ensure all of the vent sections are secure and airtight.
Qualified service personnel are familiar with vent system
inspections and may be contacted for advice.

WARNING:

DO NOT operate the water heater if the vent system shows
signs of leaking exhaust. Leaking exhaust could lead to
death, personal injury, and/or product failure.

Outdoor models

Air Intake

Vent Outlet

For outdoor models, check the air intake and vent outlet

for blockage and/or debris.

DANGER:

Shock Hazard – Make sure the electrical power to the water
heater is OFF before removing protective cover. Electric
shock will cause death or serious personal injury.

Condensate Collector

CAUTIONS:

• Condensate is known to be acidic; refer to federal, state

(provincial), and local codes for proper handling and
discharge methods.

• DO NOT operate without the condensate collector

drain connected and routed to a proper drain that can
handle corrosive condensate. This could cause the
system to malfunction or fail.

Care Instructions

On a regular basis, inspect the condensate drain line to
ensure the condensate is draining properly.

The condensate coming from the water heater is known
to be acidic. The heater features a built-in condensate
neutralizer that uses CaCO3 (calcium carbonate) in rock
form as a medium.

Periodically check the medium visually to ensure that it
is not depleted and refill accordingly. It is recommended
that you contact a qualified service technician to perform
the work.

15

CARING FOR YOUR WATER HEATER

Burner

Sight

Glass

Water Heater Inspections (cont.)

Burner

It is recommended the burner be annually inspected by
a qualified service technician.

DANGER:

Shock Hazard – Removing the front cover panel
exposes you to live electricity. Electric shock will
cause death or serious personal injury.

3

While the water heater is operating, inspect the main
burner flames through the burner sight glass. The flames
should be blue when the main burner is firing.

NOTICE:

If the flames are not blue or you observe unusual
burner operation, shut off the water heater and

1

contact a qualified service technician.

Remove 6 screws and the unit cover panel.

2

Turn on a hot water faucet.

Care Instructions

4

Turn off the hot water faucet and reinstall the unit cover
panel.

16

CARING FOR YOUR WATER HEATER

Drain Valve

Cold Water Supply

Shut-O Valve

Care and Cleaning

DANGER:

Shock Hazard – Make certain power to the water
heater is OFF before removing protective cover
for any reason. Electric shock will cause death or
serious personal injury.

WARNING:

Combustible materials, such as clothing, cleaning
materials, or flammable liquids, must not be
placed against or next to the water heater. Fire or
explosion can occur causing death, personal injury,
and/or product damage.

All care and cleaning to and around the water heater
should only be performed with the water heater turned
off and the electrical power supply disconnected.

1

Vacuum around the water heater to remove any dust,
dirt, and/or lint buildup.

NOTICE:

The air intake requires a minimum of 12 in. (30 cm)
of clearance between the air intake opening and
any obstruction.

Clean the water filter monthly, as described below and
on the next page.

Water Filter Cleaning

1

Turn off the water heater and disconnect the electrical
power supply.

2

Clean the water heater and the remote control with a
damp soft cloth and mild detergent. Gently wipe and
completely dry all surfaces.

Outdoor models

Air Intake

Vent Outlet

3

Check the air intake and vent outlet for blockage and/or
debris.

2

Turn off the water supply to the water heater.

Care Instructions

3

Drain the water heater. See "Draining the Water Heater"
section.

17

CARING FOR YOUR WATER HEATER

Care and Cleaning (cont.)

CAUTION:

DO NOT tap or force the filter during removal. This can

deform and/or damage the filter.

4

Unscrew the water filter from the base of the cold water
inlet line and carefully slide it out of the line.

CAUTION:

DO NOT overtighten the water filter. Overtightening can

deform and/or damage the filter.

6

Replace the filter in the cold water inlet line and tighten
until it is snug.

5

Clean the water filter under running water. To remove
severe sediment and dirt, use a soft brush.

Care Instructions

7

Turn on the water supply, reconnect the electrical
supply, and turn on the water heater.

18

CARING FOR YOUR WATER HEATER

Relief Valve

Preventive Maintenance

WARNING:

Failure to perform routine preventive maintenance can
prevent the water heater from operating properly. Improper
operation can cause carbon monoxide dangers, excessive
water temperatures, and other potentially hazardous
conditions resulting in death, personal injury, and/or
product damage.

Properly maintaining your water heater will ensure
dependable, trouble-free service.

User Preventive Maintenance

Establish and follow a routine preventive maintenance
program. The following suggested items should be
included in your program.

Check and clean the water filter monthly. See “Water
Filter Cleaning” on this Use and Care Manual.

WARNING:

Hot water is released during manual operation of the relief
valve. Make sure all people and animals are clear from
the area before performing this check to prevent death,
personal injury, and/or property damage from hot drain
water.

NOTICE:

If the pressure relief valve on the hot water heater
discharges periodically, this may indicate a problem in the
water system. Contact the water supplier or a plumbing
contractor to correct the problem. DO NOT plug the relief
valve outlet.

• Inspect and keep the area around the water heater clear

and free of flammable materials, such as gasoline and
other flammable vapors and liquids.

• Visually inspect the water heater for damage and/or

denting. If present, contact a service personnel to verify
proper operation.

• Check for abnormal sound during normal operation (e.g.,

hissing or banging noises). Contact a qualified service
technician or plumbing contractor if abnormal sounds are
noted.

• Check all gas and water pipes for leaks. See "Leak

Testing " on this Use and Care Manual.

NOTICE:

– DO NOT operate the water heater if you feel
something is wrong with the unit.
– DO NOT allow children to operate or handle
the unit.

Care Instructions

• Annually check the operation of the pressure relief valve
annually. Lifting the lever handle on the pressure-relief
valve opens the valve to flush hot water through the
discharge line to the drain. After several gallons have
drained, release the lever handle to close the valve and
stop draining.

• After inspections, maintenance, and/or cleaning, ensure
proper operation by turning on a hot water faucet.

Professional Preventive
Maintenance

It is recommended that a periodic inspection of the water
heater burner, relief valve, air intake filter, water filter, and
venting system be made by a qualified service technician.

WARNING:

Certain water conditions can damage the water heater and
may cause defects, malfunctions or failures of the water
heater that are not covered by the limited warranty. See
"Water Quality" on this Use and Care Manual.

19

CARING FOR YOUR WATER HEATER

Cold Water Supply

Shut-O Valve

Draining the Water Heater

WARNING:

Failure to follow these draining instructions can cause
serious personal injury from scalding and/or product
damage.

5

Close the water shut-off valve.

1

Turn off the water heater by pressing the POWER ON/
OFF button on the remote control.

2

Close the gas shut-off valve(s).

3

At least 10 seconds after Step 1, unplug the water

Care Instructions

heater or disconnect the power supply at the circuit
breaker box.

Water Drain

Valve

6

Find the water drain valve, the water filter and the water
drain plug located at bottom of the water heater.

Water Drain Plug

Water Filter

7

Using a suitable container to catch the water, remove
the water drain plug located at bottom of the water
heater, the water drain valve from the base of the hot
water outlet line, and the water filter from the base of
the cold water inlet line.

20

4

Open all hot water faucets. Run the water until it is
COLD; then shut off the faucet.

8

Connect a garden hose to the drain valve in the hot
water outlet line and place the other end in a suitable
drain. Open the drain valve until all the water has
drained from the water heater. Leave water heater as is
until placed back in service.

CARING FOR YOUR WATER HEATER

CAUTION:

Even when drained properly, a small amount of water will
remain in the water heater. In cold weather conditions,
this water can freeze. If this happens, allow the defrost
protection on the water heater at least 30 minutes to melt
the frozen water. The water heater will not work properly
until this water is thawed.

To put the water heater back in service:

1

4

Open all hot water faucets and let run until all air has
been purged from the lines. Close all hot water faucets.

Disconnect drain hose. Make sure the drain valve is
closed.

2

Reinstall the water filter in the base of the cold water inlet
line, the water drain valve, and the water drain plug.

3

Open the water shut-off valve.

5

Plug in the power cord or reconnect the power supply at
the circuit breaker box.

6

Open the gas shut-off valve(s).

7

Press the POWER ON/OFF button on the remote control
to restart the unit.

Care Instructions

21

CARING FOR YOUR WATER HEATER

Cold Water

Service Valve

Pressure Relief

Valve

Pressure

Relief Valve

Hot Water

Service Valve

Water
Outlet

Water

Outlet

Water

Inlet

Water

Inlet

Drain

Drain

Draining the Water Heater (cont.)

Standard Drain Method

Service isolator valve kits may be purchased from the
manufacturer, distributor, or place of purchase. The kits
include two full-port isolation valves to be used in the
inlet and outlet water lines. These kits provide a means
for full diagnostic testing and ease of system flushing
and draining.

Freeze Protection

WARNING:

Failure to drain the water heater can cause serious
personal injury from scalding and/or product damage.

Whenever the water heater may be exposed to freezing
conditions, make sure to completely drain the water from
the unit. See "Draining the Water Heater.

Freezing conditions come from the ventilation system
on direct-vent models and from exposure to cold air on
outdoor models.

All of these water heaters are equipped with a freeze
protection electric heater. This heater prevents freezing
inside the water heater down to an ambient temperature
of approximately -22°F (-30°C). These temperatures are
all based on temperatures without wind.

The heater only protects the internal components of the
water heater.

NOTICE:

Unplugging or disconnecting the power supply to the

Care Instructions

water heater will also disconnect the power to the freeze
protection electric heater.

External piping and valves require additional
freeze protection. One method is to wrap insulation
around the piping and valves.

Another method is to turn on a hot water faucet and
leave a small amount of water running at a faucet. This
will protect the water heater, piping, and valves from
freezing.

Running Water Freeze Protection

1

Turn off the water heater by pressing the POWER ON/
OFF button on the remote control.

2

Close the gas shut-off valve(s).

22

3

Open a hot water faucet slightly until the water stream is
approximately 1/8 in. (0.3 cm). Be sure to check the flow
periodically.

CARING FOR YOUR WATER HEATER

Vacation and Extended Shutdown

WARNING:

Failure to drain the water heater can cause serious
personal injury from scalding and/or product damage.

If the water heater is to remain idle for an extended
period of time, the power and water to the heater should
be turned off.

The water heater and piping should be drained if they
might be subjected to freezing temperatures. See
“Freeze Protection” section on this Use and Care
Manual.

After an extended shutdown, the water heater’s
operation and controls should be checked by a qualified
service technician.

Troubleshooting Chart

The information in the following troubleshooting chart
may help you diagnose and/or fix a problem you may be
experiencing. Please review this chart before calling for
service assistance.

DANGER:

Shock Hazard – Make certain power to the water heater
is OFF before removing protective cover for any reason.
Electric shock will cause death or serious personal injury.

Problem Possible Cause Solution

Not enough or no hot water.

5

12

9 1143

13

7

10

24

1. Unit is not ON. 1. Turn on the unit by pressing the

2. Water shut-off valve is not completely

opened.

3. Hot water faucet is not completely

68

1

opened.

4. Water piping is frozen. 4. Allow piping to thaw.

5. Electrical power is disconnected or

water supply is shut off.

6. The temperature may be set too low. 6. Increase the temperature setting.

7. Mixing valve malfunctions (if

applicable).

8. Error code displayed on the remote

control.

9. Not enough water demand. 9. Increase the hot water flow at the

10. Water filter is clogged or dirty. 10. Clean the water filter. (See page 17.)

11. Fixture aerator is clogged or dirty. 11. Clean the aerator.

12. Scale buildup in the heat exchanger. 12. Check for error code. If required,

13. Hot and cold water lines reversed. 13. Reverse the water lines.

WARNING:

For Your Safety, DO NOT attempt repair of electrical wiring,
gas piping remote control, burners, vent connectors, or
other safety devices. Refer repairs to a qualified service
technician.

POWER ON/OFF button.

2. Check shut-off valve and open com-

pletely.

3. Open hot water faucet completely.

(The main burner goes off when incoming
water volume is inadequate.)

5a. Plug in the power cord or reconnect

the power supply at the circuit breaker
box.

5b. Completely open the water supply valve.

(Inadequate water volume will cause the
main burner to turn off.)

7. Check and replace the mixing valve.

8. See “Service Error Code Chart” on

page 26. If required, contact a
qualified service technician.

faucet.

contact a qualified service technician.

Care Instructions

23

CARING FOR YOUR WATER HEATER

Troubleshooting Chart (cont.)

Problem Possible Cause Solution

Water not hot enough.

1

1. The temperature may be set too low. 1. Increase the temperature setting at

2. The gas valve is not completely opened. 2. Check and completely open the gas valve.

the remote control.

Water too hot.

3

3. Gas supply pressure is low. 3. Contact your gas utility company or gas

2

4. Bleed-over in one of the hot water

fixtures.

contractor to verify the gas meter and
gas piping size.

4. Contact a dealer or a qualified service

technician.

1. Temperature is set too high. 1. Decrease the temperature setting at

1

2. Water shut-off valve is not completely

opened.

the remote control.

2. Check and completely open the water

shut-off valve.

3. Small amount of water has been heated. 3. Increase the hot water flow at the

faucet to allow more water to flow
through the water heater.

2

Fan continues to rotate after the hot water

Care Instructions

faucet is closed.

24

The post-purge cycle clears flue gases. Normal operation.

CARING FOR YOUR WATER HEATER

Service Error Code Chart

Your water heater has an electronic diagnostic system
built into it. When the water heater finds a problem, it
displays an error code in the LED display on the remote
control. The chart on the next page lists the error codes
along with their possible problem and solution. Using
this chart may help you diagnose and/or fix a problem
you may be experiencing. Please refer to this chart
before calling for service assistance.

DANGER:

Shock Hazard – Make certain power to the water heater
is OFF before removing protective cover for any reason.
Electric shock will cause death or serious personal injury.

WARNING:

For Your Safety, DO NOT attempt repair of electrical wiring,
gas piping, remote control, burners, vent connectors, or
other safety devices. Refer repairs to a qualified service
technician.

When an error code is displayed:

3

Wait about 5 minutes; then restart the water heater by
pressing the POWER ON/OFF button.

4

1

Turn off all the hot water faucets.

2

Turn off the water heater by pressing the POWER ON/
OFF button on the remote control.

Turn on a hot water faucet and recheck the remote
control display.

If the error code remains in the display:

1. Turn off the hot water faucet.

2. Turn off the water heater.

3. Unplug the water heater from power, wait about 30

seconds and plug back in.

4. Follow the error code chart information.

5. Restart the water heater, turn on a hot water faucet,

and recheck the remote control display.

If the error code is still shown:

1. Turn off the hot water faucet.

2. Turn off the water heater.

3. Make note of the displayed error code and call for

service assistance. See “Call for Assistance”
section on this Use and Care Manual.

NOTICE:

If the displayed error code is not listed in the chart,
immediately turn off the water heater and call for service
assistance.

Care Instructions

25

CARING FOR YOUR WATER HEATER

Service Error Code Chart (cont.)

Error Code Possible Cause Solution

1L

05

11

12

13

14

15

29

31

33

61 or 99

65

92

93

P1

88

Water heater has buildup of lime deposits. Contact a dealer or qualified service techni-

Air intake or vent exhaust opening may be
blocked.

The vent pipes on the vent termination may
not be connected properly.

The gas shut-off valve is not fully opened. Check shut-off valve and open completely.

Gas service has been interrupted. Contact your gas utility company.

LP gas is running low (LP models only). Refill or replace your LP gas container.

If this code is still displayed after taking the
numbered steps above.

Water heater is overheating. Contact a dealer or qualified service techni-

The heat exchanger is too hot. Check for blockage in the vent. Contact a

Neutralizer is clogged. Contact a dealer or qualified service techni-

Faulty inlet thermistor. Contact a dealer or qualified service techni-

Faulty outlet thermistor. Contact a dealer or qualified service techni-

Faulty blower motor. Contact a dealer or qualified service techni-

Faulty water flow solenoid. Contact a dealer or qualified service techni-

The neutralizer needs to be replaced soon. The unit can be used for a while, but contact

The neutralizer must be replaced. The unit cannot be used until the neutralizer

Not enough water flow to operate the unit. Increase the water flow from the fixtures.

Reminder of flushing the heat exchanger and/
or replacing the water treatment filter.

cian.

Remove any blockage. (Air intake requires 12
in. [30 cm] of clearance.)

Contact a dealer or qualified service techni­cian.

Contact a dealer or qualified service techni­cian.

cian.

dealer or qualified service technician.

cian.

cian.

cian.

cian.

cian.

a dealer or qualified service technician.

is replaced. Contact a dealer or qualified
service technician.

Contact a dealer or qualified service techni­cian.

IF YOU NEED SERVICE

Care Instructions

Service Information

26

Call for Assistance

1. All questions, adjustments, repairs, and/or routine
maintenance should be directed to your installer,
plumbing contractor, or licensed service agent. If your
contacts have moved or are not available, please refer
to the telephone directory, commercial listings, or
local utility company for qualified service assistance.

2. If your problem has not been solved to your
satisfaction, contact the Manufacturer National
Service Department at the following address:

Manufacturer National Service Department

800 Interstate Park Drive
Suite 700
Montgomery, AL 36109
Phone: [phone]

When contacting the manufacturer, the following
information will be requested:

A. Model and serial number. (See page 8 or the ratings

plate on the side of the water heater.)
B. Address where the water heater is located.
C. Name and address of installation contractors (page

8) and all qualified service companies that have

worked on the water heater.
D. Original installation date. (See page 8.)
E. Dates any service or preventive maintenance was

performed.
F. Details of the persisting problem.
G. List of businesses that have tried to fix this problem,

along with dates of service.

INSTALLATION

Installation

INSTRUCTIONS

FOR THE CONTRACTOR

27

INSTALLATION INSTRUCTIONS

Standards Compliance

General

This water heater must be installed in accordance with
these instructions, local codes, and utility company
requirements.

In the United States where local codes are not
available, use the latest edition of the American National
Standard/National Fuel Gas Code. A copy of the Fuel
Gas Code can be purchased from either the American
Gas Association, 400 North Capitol Street Northwest,
Washington, DC 20001, as ANSI standard Z223.1, or
National Fire Protection Association, 1 Batterymarch

Choosing a Location

WARNING:

Fire Hazard –Combustible construction refers to adjacent
walls and ceilings and should not be confused with
combustible or flammable products and materials.
Combustible materials, such as clothing, cleaning
materials, or flammable liquids, must not be placed against
or next to the water heater. Fire or explosion could occur
causing death, personal injury, and/or product damage.

A gas-fired water heater should never be installed in a
space or room where liquids with flammable vapors are
used or stored. Such liquids include gasoline, LP gas
(butane or propane), paint, adhesives and their thinners,
solvents, or removers. Flammable vapors carry long
distances from where they are used or stored. The open
flame of the water heater’s main burner can ignite these
vapors causing an explosion or fire.

NOTICE:

Elevating a gas-fired water heater will reduce but NOT
eliminate the possibility of lighting the vapor of flammable
liquids which may be improperly stored or accidentally
spilled.

NOTICE:

DO NOT connect power until venting installation is complete
(see Venting installation).

Park, MA 02269 as NFPA 54.

In Canada, use the latest edition of the CAN/CSA B149.1
Natural Gas and Propane Installation Code and the
Canadian Electrical Code, CAN/CSA C22.1, Part 1.

A copy can be purchased from; Canadian Standards
Association, 5060 Spectrum Way, Mississauga, ON L4W
5N6

NOTICE:

This water heater should not be located in an area where
water leakage of the heat exchanger or connections will
result in damage to the area adjacent to it or to lower floors
of the structures. When such areas cannot be avoided,
install a suitable catch pan with an adequate drain under
the water heater.

The following requirements will ensure a safe installation:

• The water heater must be located in an area where it

won’t sustain damage from moving vehicles, flooding,
etc. If the water heater is installed in a storage garage,
the direct ignition system and main burner should be
no less than 18 in. (45 cm) above the garage floor.

• If the water heater is installed in a repair garage or in

a private garage, the direct ignition system and main
burner should be no less than 4.5 ft (1400 mm) above
the garage floor.

• The water heater should be installed as close as

possible to the vent exhaust and air intake. This
minimizes the vent length and the number of elbows
and joints required for venting.

• The water heater should be installed with the correct

venting and exhaust materials. See "Venting" on this
Use and Care Manual.

28

12"

(300 mm)

Minimum

Air Intake Pipe

Exhaust Vent Pipe

Upward Slope
to Termination

0" min.
(0 mm)

INSTALLATION INSTRUCTIONS

12" min.

(300 mm)

12" min.

(300 mm)

1/2" min.

(13 mm)

12" min.

(300 mm)

0"

(0 mm)

0" min.

(0 mm)

Sealing Plate

Choosing a Location (cont.)

• Every vent or air intake pipe penetration of a floor or

ceiling should be sealed.

• Failure to install and properly vent the water heater to
the outdoors as outlined on "Venting" can result in
unsafe operation.

• Long hot water lines should be insulated to conserve
water and energy.

• The water heater and water lines should be protected

from exposure to freezing temperatures.

General

• Minimum water heater clearances from combustible
and noncombustible construction are as follows:
– 1/2 in. (1.3 cm) for sides
– 0 in. (0 cm) for rear with support bracket(s)
– 12 in. (30 cm) from the bottom, top, and front

– 0 in. (0 cm) for vent or air intake pipe

NOTICE:

Preferred maintenance clearance is 24 in. (61 cm)
from top, bottom, and front of unit.

• DO NOT install the water heater in areas
prohibited by National Fuel Gas Code in
U.S. installation or CAN/CSA B149.1 in
Canadian installation.

• DO NOT install the water heater where it
is subject to vibrations.

• DO NOT install the water heater in a
recreational vehicle, mobile home, boat,
or other watercraft.

• DO NOT install the water heater near
vents for heating and cooling unless
a minimum clearance of 4 ft (1.2 m) is
maintained.

29

INSTALLATION INSTRUCTIONS

Product Inspection

General

Visually inspect the water heater for any possible
damage.

Check the rating plate on the water heater to make sure
the water heater was designed to be used with the
supplied type of gas (natural or LP).

Remote Control

Verify that all included supplied parts are present as
shown.

Screws

Washers

Manual Gas Shut-off

Valve

30

Remote Control Cable

Water Heater Installation

Corrosive Atmosphere

NOTICE:

The water heater should not be installed near an air supply
containing halogenated hydrocarbons where contaminants
can enter the combustion air supply.

Avoid installing a water heater in any of the following
locations: beauty shops, dry-cleaning establishments,
photo processing labs, and storage areas for liquid and
powdered bleaches or swimming pool chemicals. These
locations often contain such halogenated hydrocarbons.

Pressure Relief Valve

(Some models only)

The air supply containing halogenated hydrocarbons is
safe to breathe, but when passed through a gas flame,
corrosive elements are released that will shorten the life
of any gas-burning appliance.

Propellants from common spray cans or gas leaks from
A/C and refrigeration equipment are highly corrosive
after passing through a flame.

NOTICE:

The water heater warranty is void when the failure is due to
operation in corrosive conditions.

INSTALLATION INSTRUCTIONS

Water Heater Installation (cont.)

NOTICE:

The National Fuel Gas Code (NFGC) and CAN/CSA B149.1 mandate a manual gas shut-off valve.
See NFGC/B149.1 for complete instructions. Local codes or plumbing authority requirements may vary from the instructions or
diagrams provided and take precedence over these instructions.

Typical Installation of Direct-Vent Water Heater

Wall
Plate

(Recommended)

90˚

Elbow

90˚

Elbow

Air Intake Pipe

Upward Slope to

outside termination

Exhaust Vent Pipe

General

Outside

Wall

Water

Filter

Power
Supply

Cord

To Hot Water

Faucet(s)

Union

Union

Condensate

Drain*

Drain Valve

*Note: A flexible drain tube can be used.

**Note: Condensate trap should be installed as close as practical to the water heater.

A similar condensate trap is allowed as long as it prevents rain, condensate or any
other liquid from entering into the water heater.

Suitable

Drain

Relief
Valve

Service

Service

Valve

Valve

(supplied)

(supplied)

To

To

Suitable

Drain

Cold Water Supply

Shut-Off Valve

Manual Gas
Supply Line

Shut-Off Valve

Manual Gas

Shut-Off Valve

(Supplied)

Union

Sediment Trap

Cap

31

INSTALLATION INSTRUCTIONS

Water Heater Installation (cont.)

General

Typical Installation of
Outdoor Water Heater
(No Venting Required)

This water heater is for OUTDOOR installation only.

Hard-Wire

(not supplied)

WARNING:

DO NOT install this water heater indoors or in a confined space.
It is designed for outdoor installation only. Any other type of
installation can result in death, personal injury, and/or damage
to the product or property.

Flue

Terminal

Air Intake

Water

Filter

32

To Hot Water

Faucet(s)

Condensate

Drain*

Drain Valve

*Note: A exible drain tube can be used

UnionUnion

To Suitable

Drain

Relief

Relief

Valve

Valve

Service

Service

Valve

Valve

(supplied)

(supplied)

To Suitable

Drain

Shut-Off Valve

Union

Cold Water Supply

Shut-Off Valve

Manual Gas

(Supplied)

Sediment Trap

Cap

Manual Gas
Supply Line

Shut-Off Valve

INSTALLATION INSTRUCTIONS

Mounting the Water Heater

CAUTION:

Reinforcement of the wall is required where the wall is not
strong enough to hold the water heater. Failure to do so
could result in personal injury and/or property damage.

The mounting location for the water heater should allow
for easy access and operation.

1

The water heater is designed to be installed either inside
the wall cavity between the wall studs or outside the
wall cavity. Either installation requires the water heater
to be supported with a wooden support brace between
the wall studs, or a piece of wood that is equal in size to
the water heater and securely attached to the wall studs
before the water heater is attached to it. This piece of
wood can be installed inside or outside of the wall. Use
wood screws to secure brackets to wall. If mounting to a
concrete wall, use lag bolts designed for concrete.

2

General

3

Attach the mounting bracket to the wall and secure it by
4 screws and washers. Make sure it is level and that it
can support the weight of the water heater.

4

NOTICE:

The image above may differ in appearance from your water
heater.

Align the grooves on the back of the water heater with
the tongues on the mounting bracket and hang the
water heater on the bracket. When mounted with the
mounting bracket, the water heater will have a 5/8" (16
mm) clearance from the back of the wall. Using two
screws and washers , secure the lower mounting bracket
to the wall.

Make sure the proper electrical outlet or supply (120
VAC/60 Hz) is available and located near the unit. Direct­vent models come with a 6-ft. (1.8-m) power cord, while
the outdoor models require hard-wiring or the addition
of a plug.

NOTICE:

DO NOT connect power until venting installation is complete
(see Venting installation).

33

INSTALLATION INSTRUCTIONS

Venting for Direct-Vent Water Heater

Venting

DANGER:

Failure to properly vent the water heater to the outdoors
as outlined in this Venting section will result in death or
serious personal injury. To avoid the risk of fire, explosion,
or asphyxiation from carbon monoxide, NEVER operate the
water heater unless it is properly vented and has adequate
air supply for proper operation as outlined in this Venting
section. This water heater must have air supply connected

and terminated to the outdoors.

WARNING:

Refer to page 29 for required clearances to combustible
materials. Improper clearances can cause explosion or fire
resulting in death, personal injury, and/or product damage.

CAUTIONS:

•

Check to make sure flue gases DO NOT recirculate into the
air intake terminal when using direct venting. If the water
heater is having service issues, flue recirculation may be a
contributing factor.

• Even when the minimum vent terminal separation
distances are followed, recirculation may still occur
depending upon the location outside the building, the
distance from other buildings, proximity to corners,
weather conditions, wind patterns, and snow depth.

• Periodically check to make sure that flue recirculation
is not occurring. Signs of flue gas recirculation include
frosted or frozen intake terminals and condensate in the
intake terminal and venting system.

• Correction to flue recirculation may involve angling the
intake away from the exhaust terminal and increasing the
distance between them. Check to be sure the intake and
exhaust terminals are not obstructed, especially during
periods of below-freezing weather.

Venting Requirements

The installation of venting must comply with national
codes, local codes, and the vent manufacturer’s
instructions.

The vent exhaust and air intake must terminate outside
as described in these instructions. DO NOT vent this
water heater through a chimney. It must be vented
separately from all other appliances.

NOTICE:

The unit can be vented using only the following approved
vent pipe material.

Use only 2 or 3 inch diameter pipe. Refer to local codes
for restrictions on the use of InnoFlue® PP, PVC, CPVC,
or ABS pipe and fittings. All exhaust venting materials for
product installed in Canada must meet ULC-S636.

The use of cellular core PVC (ASTM F891), cellular
core CPVC, or Radel® (polyphenolsulfone) in non­metallic venting systems is prohibited and that
covering non-metallic vent pipe and fittings with
thermal insulation is prohibited.

This water heater requires a special venting system.
Refer to venting supplier’s instruction for complete parts
list and method of installation. The manufacturers and
product lines listed on the following tables have been
tested and authorized to safely operate with Rheem
tankless water heater.

Approved Vent Materials, Fittings and Terminations:

CPVC

Schedule 40,
ASTM F-441

Schedule 40,
ASTM F-441,
and CPVC 4120,
ASTM-D2846

Schedule 40,
ASTM F-438

Acceptable Materials
for Exhaust

Acceptable Materials
for Air Intake

Fittings

Terminations
(Manufactured
by Polytech)

PVC

Schedule 40,
ASTM D-1785

Schedule 40,
ASTM D-1785,
and DWV,
ASTM-D2665

Schedule 40,
ASTM D-2665

RXGY-G01

RXGY-G02

PTX-129

RXGY-E03A

RXGY-G01C

ABS is not permitted for exhaust vent in Canada

ABS

Schedule 40,
ASTM D-2661

Schedule 40,
ASTM D-2661

Schedule 40,
ASTM D-2661

Approved Polypropylene Vent Manufacturer/Trade Name:

Manufacturer

Trade Name

Single Wall Pipe

Elbow

Adapter

Non-Return Valve (NRV)

Siphon

Termination

Centrotherm

InnoFlue®

ISVL**** or ISVL****UV

ISELL**** or ISELL****UV

ISAAL0202

ISNRV****

IASJBVS

ISLPT**** or ISTT****

*Refers to variations in nominal size.

DO NOT USE Schedule 20, Cell Core, Drain Pipe,
Galvanized, Aluminum, B-Vent, or any flexible vent.

34

INSTALLATION INSTRUCTIONS

Venting for Direct-Vent Water Heater

Vent Lengths and
DIPswitch Adjustments

Before starting the vent installation, careful planning
should be given to the routing and termination of the
vent pipes. The length of the vent pipes (inlet and
outlet) should be kept to a minimum. Also, see pages
39–40 and 46 for vent terminal placement. Refer to the
maximum and minimum vent length charts for the pipe
sizes that can be used and the total equivalent length
of pipe that can be used. DO NOT exceed equivalent
length of pipe in maximum vent length chart.

Appropriate dip switch adjustment shall be required to
allow certain vent length. There are 2 vent configuration
settings, A-1 and A-2 settings at 0 - 2,000 ft (0 - 610 m)
elevation.

As set
from factory

To have a longer vent length with 2" vent, A-2 setting is
required:

Venting

1

Turn off the gas and water to the water heater by closing
the shut-off valves.

2

Remove the front cover panel on the water heater.

MIN MAX ADJ

A-1 setting is default and factory setting. All dip switches
are off.

Minimum Vent Length (intake/outlet):

Number of

90° Elbows

1 1.0 ft. (0.3 m)

Minimum Length

of 2" or 3" Straight

Pipe

Maximum Vent Length (intake/outlet)

Number of
90° Elbows

1 22.0 ft (6.7 m) 148.5 ft (45.3 m)

2 19.0 ft (5.8 m) 147.0 ft (44.8 m)

3 16.0 ft (4.9 m) 145.5 ft (44.3 m)

4 13.0 ft (4.0 m) 144.0 ft (43.9 m)

5 10.0 ft (3.0 m) 142.5 ft (43.4 m)

6 7.0 ft (2.1 m) 141.0 ft (43.0 m)

Maximum Length of 2"
Straight Pipe

Maximum Length of 3"
Straight Pipe

Dip Switches

Control

3

Find DIP Switch 2 located in the top-right portion of the
control board. The switch labeled “DIP 2” is the bottom
switch.

Board

As set
from factory

4

The factory settings for this switch should all be in the
OFF position (DOWN).

35

INSTALLATION INSTRUCTIONS

Venting for Direct-Vent Water Heater

The system will not operate if there is excessive
restriction (pressure drop) in the venting system. Use the

Dip #2 is on

5

To set A-2 setting, change the second swtich on "DIP 2"
to the ON position (UP).

NOTICE:

DO NOT alter any other DIP switch settings. Please
contact technical service listed on page 26 of this use
and care manual if you have any questions of DIP switch
adjustments.

6

chart above to calculate the maximum pipe run length
with the required number of elbows (e.g., a maximum 57
ft. [17.4 m] of 2" vent pipe may be used provided there is
only one 90° elbow in the system).

A 90° elbow is equivalent to 3 ft (0.9 m) of 2", and to 1ft.
6 in (0.5m) of 3" straight pipe. A 45° elbow is equivalent
to 1ft. 6 in (0.5 m) of 2" straight pipe, and 9ft. (0.25 m) of
3" straight pipe.

The vent termination and/or one 90 degree elbow at air
intake does not count as part of the straight pipe equivalent
when determining the total vent length.

NOTICE:

To use 3" vent pipe, an increasing adapter will be required.

WARNING:

To use Category III Stainless Steel, a proper transition part
will be required to prevent flue gas from leaking.
This water heater requires the correct DIP switch
adjustments per vent length for proper operation. Incorrect
DIP switch adjustments may cause improper water heater

operation resulting in serious injury or death.

Replace the front cover panel.

7

Turn on the gas and water to the water heater by
opening the shut-off valves.

Minimum / Maximum Vent Length
(intake/outlet) each at A-2 Setting

Number

of 90°

Elbows

Minimum Length of

2" Straight Pipe

1 22.0 ft (6.7 m) 57.0 ft (17.4 m) Not allowed

2 19.0 ft (5.8 m) 54.0 ft (16.5 m) Not allowed

3 16.0 ft (4.9 m) 51.0 ft (15.5 m) Not allowed

4 13.0 ft (4.0 m) 48.0 ft (14.6 m) Not allowed

5 10.0 ft (3.0 m) 45.0 ft (13.7 m) Not allowed

6 7.0 ft (2.1 m) 42.0 ft (12.8 m) Not allowed

Maximum Length of

2" Straight Pipe

3" Pipe

Depending on the size of pipe that is chosen for venting
the water heater, it might be necessary to use a fitting
for stepping down in pipe size, to connect to the water
heater.

All intake and exhaust venting components must have
the same diameter size. DO NOT use a different size on
the intake and exhaust venting.

It is recommend to have a vent length as short as
possible. Input rate of the water heater decreases if there
is restriction (pressure drop) in the venting system.

The following table shows approximate input rate
reduction. Actual input rate reduction may be different at
each installation.

Setting Vent Size Min Vent Length Max Vent Length

A-1

A-2 2" 10% 20 - 25%

3" 0% 15 - 20%

2" 5% 15 - 20%

36

INSTALLATION INSTRUCTIONS

Venting for Direct-Vent Water Heater

Preexisting Venting Notes:

If the water heater is being installed as a replacement
for an existing water heater, a thorough inspection of
the existing venting and air intake system must be
performed prior to any installation work. Verify that the
correct materials, vent lengths, and terminal locations
as described in this manual have been met. Carefully
inspect the entire venting and air intake system for any

signs of cracks or fractures, particularly at the joints
The unit may be vented horizontally through a wall or
vertically through the roof. Pipe runs must be adequately
supported along both vertical and horizontal runs.
Maximum unsupported span is recommended to be
no more than 4 feet (1.2 m). It is imperative that the first
hanger be located on the horizontal runs immediately
adjacent to the first 90-degree elbow from the vertical
rise. Only use support isolation hanging bands. DO
NOT use wire to support pipe runs.

Stress levels in the pipe and fittings can be significantly
increased by improper installation. If rigid pipe clamps
are used to hold the pipe in place, or if the pipe cannot
move freely through a wall penetration, the pipe may
be directly stressed, or high thermal stresses may be
formed when the pipe heats up and expands. Install
accordingly to minimize such stresses.

between elbows or other fittings and the straight runs

of vent pipe. Check the system for signs of sagging or

other stresses in the joints as a result of misalignment

of any components in the system. If any of these

conditions are found, they must be corrected in

accordance with the venting instructions in this manual

before completing the installation and putting the water

heater into service.

NOTICES:

• It is recommended that the air intake pipe and exhaust

pipe have a 1/4" per foot upward slope toward the
outdoors.

• Maintain the proper clearance between the vent pipe

and combustible or noncombustible materials as
described on page 29.

• A clearance of 0 in. (0 cm) is allowed between the vent

or air intake pipe and combustible material.

• Use proper support for the vent and air intake pipes.

• It is recommended the support method used isolates the

vent pipe from floor joists or other structural members.
This helps prevent transmission of noise and vibration.

• DO NOT support, pin, or otherwise secure the venting

system in a way that restricts the normal thermal
expansion and contraction of the chosen venting
material.

See page 38 for additional requirements for the
Commonwealth of Massachusetts.

37

Venting

INSTALLATION INSTRUCTIONS

Venting for Direct-Vent Water Heater

In the Commonwealth of Massachusetts

The Commonwealth of Massachusetts requires
compliance with regulation 248 CMR 4.00 and 5.00 for
installation of through-the-wall vented gas appliances as
follows:

5.08: Modifications to NFPA–54, Chapter 10

(1) Revise NFPA–54 section 10.5.4.2 by adding a second
exception as follows:

Existing chimneys shall be permitted to have their use
continued when a gas conversion burner is installed,
and shall be equipped with a manual reset device that
will automatically shut off the gas to the burner in the
event of a sustained back-draft.

(2) Revise 10.8.3 by adding the following additional
requirements:

(a) For all side-wall, horizontally vented, gas-fueled
equipment installed in every dwelling, building,
or structure used in whole or part for residential
purposes, including those owned or operated by the
Commonwealth and where the side-wall exhaust vent
termination is less than seven (7) feet above finished
grade in the area of the venting, including but not limited
to decks and porches, the following requirements shall
be satisfied.

1. INSTALLATION OF CARBON MONOXIDE
DETECTORS. At the time of installation of the side-wall,
horizontally vented, gas-fueled equipment, the installing
plumber or gas fitter shall observe that a hard-wired
carbon monoxide detector with an alarm and battery
backup is installed on the floor level where the gas
equipment is to be installed. In addition, the installing
plumber or gas fitter shall observe that a battery­operated or hard-wired carbon monoxide detector
with an alarm is installed on each additional level of
the dwelling, building, or structure served by the side­wall, horizontally vented, gas-fueled equipment. It shall
be the responsibility of the property owner to secure
the services of qualified licensed professionals for the
installation of hard-wired carbon monoxide detectors.

a. In the event that the side-wall, horizontally vented, gas­fueled equipment is installed in a crawl space or an attic, the
hard-wired carbon monoxide detector with alarm and battery
backup may be installed on the next adjacent floor level.

b. In the event that the requirements of this subdivision cannot
be met at the time of completion of installation, the owner
shall have a period of thirty (30) days to comply with the above
requirements, provided, however, that during said thirty (30)
day period, a battery-operated carbon monoxide detector with
an alarm shall be installed.

2. APPROVED CARBON MONOXIDE DETECTORS. Each
carbon monoxide detector as required in accordance with the
above provisions shall comply with NFPA 720 and be ANSI/UL
2034-listed and IAS-certified.

3. SIGNAGE. A metal or plastic identification plate shall be
permanently mounted to the exterior of the building at a
minimum height of eight (8) feet above grade directly in line
with the exhaust vent terminal for the horizontally vented, gas­fueled heating appliance or equipment. The sign shall read, in
print size no less than one-half (1/2) inch in size, “GAS VENT
DIRECTLY BELOW. KEEP CLEAR OF ALL OBSTRUCTIONS.”

4. INSPECTION. The state or local gas inspector of the side­wall, horizontally vented, gas-fueled equipment shall not
approve the installation unless, upon inspection, the inspector
observes carbon monoxide detectors and signage installed
in accordance with the provisions of 248 CMR 5.08 (2)(a)(1
through 4).

(b) EXEMPTIONS: The following equipment is exempt from 248
CMR 5.08 (2)(a)(1 through 4):

1. The equipment listed in Chapter 10 entitled “Equipment Not
Required To Be Vented” in the most current edition of NFPA 54
as adopted by the Board, and

2. Product-approved side-wall, horizontally vented, gas-fueled
equipment installed in a room or structure separate from the
dwelling, building, or structure used in whole or in part for
residential purposes.

(c) MANUFACTURER REQUIREMENTS – GAS EQUIPMENT
VENTING SYSTEM PROVIDED. When the manufacturer of
product-approved side-wall, horizontally vented, gas-fueled
equipment provides a venting system design or venting
system components with the equipment, the instructions
provided by the manufacturer for installation of the equipment
and the venting system shall include:

1. Detailed instructions for the installation of the venting system
design or the venting system components; and

2. A complete parts list for the venting system design or
venting system.

(d) MANUFACTURER REQUIREMENTS – GAS EQUIPMENT
VENTING SYSTEM NOT PROVIDED. When the manufacturer
of product-approved side-wall, horizontally vented, gas-fueled
equipment does not provide the parts for venting the flue
gases, but identifies “special venting systems,” the following
requirements shall be satisfied by the manufacturer:

1. The referenced “special venting systems” instructions shall
be included with the appliance or equipment installation
instructions, and

2. The “special venting systems” shall be product-approved by
the Board, and the instructions for that system shall include a
parts list and detailed installation instructions.

(e) A copy of all installation instructions for all product­approved side-wall, horizontally vented, gas-fueled equipment,
all venting instructions, all parts lists for venting instructions,
and/or all venting design instructions shall remain with the
appliance or equipment at the completion of the installation.

38

INSTALLATION INSTRUCTIONS

Venting for Direct-Vent Water Heater

Inside

corner detail

Fixed

closed

Fixed

closed

Operable

Operable

Venting

VENT TERMINAL

V

AIR SUPPLY INLET

X

AREA WHERE TERMINAL IS NOT PERMITTED

Horizontal Vent Terminal Location for Other than Direct Vent

The following information should be used for determining the proper location of the vent terminal for direct vent water
heaters.

A= Clearance above grade, veranda, porch,

deck or balcony.

B= Clearance to window or door that may

be opened.

C= Clearance to permanently closed window.

D= Vertical Clearance to ventilated soffit located

above the terminal within a horizontal distance of
2 feet (61 cm) from the center line of the terminal.

E= Clearance to unventilated soffit.

F= Clearance to outside corner.

G= Clearance to inside corner.

H = Clearance to each side of center line

extended meter/regulator assembly.

I = Clearance to service regulator vent outlet.

J = Clearance to nonmechanical air supply

inlet to building or the combustion air
inlet to any other appliance..

Canadian Installations

12 inches (30 cm) 12 inches (30 cm)

6 inches (15 cm) for appliances < 10,000 Btuh (3 kW),
12 inches (30 cm) for appliances > 10,000 Btuh (3kW)
and < 100,000 Btuh (30kW), 36 inches (91 cm) for
appliances > 100,000 Btuh (30kW).

* *

*

* *

* *

* *

* *

Above a regulator within 3 feet (91 cm) horizontally of
the vertical center line of the regulator vent outlet to a
maximum vertical distance of 15 feet (4.5 m).

6 inches (15 cm) for appliances < 10,000 Btuh (3 kW),
12 inches (30 cm) for appliances > 10,000 Btuh (3kW)
and < 100,000 Btuh (30kW), 36 inches (91 cm) for
appliances > 100,000 Btuh (30kW).

1

US Installations

4 feet (1.2 m) below or to side of
opening; 1 foot (300 mm) above
opening.

4 feet (1.2 m) below or to side of
opening; 1 foot (300 mm) above
opening.

2

*

*

K = Clearance to mechanical air supply inlet.

L = Clearance above paved sidewalk or paved

driveway located on public property.

M = Clearance under veranda, porch, deck

or balcony.

6 feet (1.83 m)

7 feet (2.13 m)+ 7 feet (2.13 m)+

12 inches (30 cm)

3 feet (91 cm) above if within 10 feet
(3 m) horizontally.

*

1 In accordance with current CAN/CSA-B149.1 Installation Codes.
2 In accordance with current ANSI Z223.1/ NFPA 54 National Fuel Gas Code.
+ A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family

dwellings and serves both dwellings.

"Clearance in accordance with local installation codes and the requirements of the gas supplier."

*

39

INSTALLATION INSTRUCTIONS

Venting

Venting for Direct-Vent Water Heater

Inside

corner detail

Fixed

closed

Fixed

closed
Operable

VENT TERMINAL

V

AIR SUPPLY INLET

X

Horizontal Vent Terminal Location for Direct Vent

The following information should be used for determining the proper location of the vent terminal for direct vent water heaters.

Canadian Installations

Operable

Regulator
vent outlet

AREA WHERE TERMINAL IS NOT PERMITTED

1

US Installations

2

A= Clearance above grade, veranda,

porch, deck or balcony.

B= Clearance to window or door that

may be opened.

C= Clearance to permanently closed

window.

D= Vertical Clearance to ventilated

soffit located above the terminal
within a horizontal distance of 2
feet (61 cm) from the center line of
the terminal.

E= Clearance to unventilated soffit.

F= Clearance to outside corner.

G= Clearance to inside corner.

H = Clearance to each side of center line

extended meter/regulator assembly.

I = Clearance to service regulator vent

outlet.

J = Clearance to nonmechanical air

supply inlet to the building or the
combustion air inlet of any other
appliance.

12 inches (30 cm)

6 inches (15 cm) for appliances < 10,000 Btuh
(3 kW), 12 inches (30 cm) for
appliances > 10,000 Btuh (3kW) and
< 100,000 Btuh (30kW), 36 inches (91 cm) for
appliances > 100,000 Btuh (30kW).

* *

*

* *

*

*

*

Above a regulator within 3 feet (91 cm)
horizontally of the vertical center line of the
regulator vent outlet to a maximum vertical
distance of 15 feet (4.5 m).

6 inches (15 cm) for appliances < 10,000 Btuh
(3 kW), 12 inches (30 cm) for
appliances > 10,000 Btuh (3kW) and
< 100,000 Btuh (30kW), 36 inches (91 cm) for
appliances > 100,000 Btuh (30kW).

12 inches (30 cm)

6 inches (15 cm) for appliances.< 10,000 Btuh
(3 kW), 9 inches (23 cm) for
appliances > 10,000 Btuh (3 kW) and
< 50,000 Btuh (15 kW), 12 inches (30 cm) for
appliances > 50,000 Btuh (15 kW)

*

*

*

*

*

6 inches (15 cm) for appliances.< 10,000 Btuh
(3 kW), 9 inches (23 cm) for
appliances > 10,000 Buth (3 kW) and
< 50,000 Btuh (15 kW), 12 inches (30 cm) for
appliances > 50,000 Btuh (15 kW)

40

K = Clearance to mechanical air supply

inlet.

L = Clearance above paved sidewalk or

paved driveway located on public
property.

M = Clearance under veranda, porch,

deck or balcony.

6 feet (1.83 m)

7 feet (2.13 m)+

12 inches (30 cm)

3 feet (91 cm) above if within 10 feet(3 m)
horizontally.

*

*

1 In accordance with current CAN/CSA-B149.1 Installation Codes.
2 In accordance with current ANSI Z223.1/ NFPA 54 National Fuel Gas Code.
+ A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family

dwellings and serves both dwellings.

*"Clearance in accordance with local installation codes and the requirements of the gas supplier."

INSTALLATION INSTRUCTIONS

Rising moisture will collect under eaves.

Inside

Corner

Caulk

Caulk

Caulk

Caulk

If sot vent is too close,
block o and install new
vent at another location.

6' (1.8 m) Caulk zone or
to edge of window etc.,
starting within 6' (1.8 m)

4'

(1.2 m)

5.5”to 24 “

(14 cm to 61cm)

Rising moisture will collect under eaves.

Inside

Corner

Caulk

Caulk

Caulk

If soft vent is too close,
block off and install new
vent at another location.

6' (1.8 m) Caulk zone
or to edge of window
etc., starting within
6' (1.8 m)

4'

(1.2 m)

12"

(300 mm)

Horizontal Vent Considerations

WARNING:

Moisture in the flue gas will condense as it leaves the vent
terminal. In cold weather this condensate can freeze on the
exterior wall, under the eaves, and on surrounding objects.
Some discoloration to the exterior of the building is to be
expected. However, improper location or installation can
result in severe damage to the structure or exterior finish of
the building.

– DO NOT locate vent terminal on the side of a building

with prevailing winter winds. This will help prevent
water lines from freezing and moisture from freezing on
walls and under eaves.

– DO NOT locate vent terminal too close to shrubbery, as

flue gasses may damage them. A minimum distance of 4
ft. (1.22 m) is recommended.

– All painted surfaces should be primed to lessen the

chance of physical damage. Painted surfaces will
require maintenance.

– Guard against accidental contact with people and pets.

Indoor Tankless Water Heaters

WARNING:

For multiple-unit installations, a minimum distance
between vent terminations must be maintained to prevent
recirculation of vent gases. Maintain a center-to-center
distance between each pair of vent terminations as listed
below:

24 in. (61 cm) for a two-unit installation;

24 in. (61 cm) and 36 in. (91.4 cm) for a three-unit
installation;

– DO NOT terminate vent directly on brick or masonry

surfaces. Use rust-resistant, sheet-metal backing plate
behind the vent.

– The vent for this appliance shall not terminate

• Over public walkways; or

• Near soffit vents or crawl space vents or other area
where condensate or vapor could create a nuisance
or hazard or cause property damage; or

• Where condensate or vapor could cause damage or
could be detrimental to the operation of regulators,
relief valves, or other equipment.

– Caulk all cracks, seams, and joints within

6 ft. (1.8 m) of the vent terminal.

– Caulk around wall faceplate for weather-tight seal.

– DO NOT extend exposed vent pipe of indoor water

heaters outside of the building.

– This water heater requires its own separate venting

system. DO NOT connect the exhaust vent to an existing
vent pipe or chimney.

– Observe minimum clearances. Vent terminals must be

a minimum of 5.5 inches (14 cm) and a maximum of 24
inches (61 cm) apart horizontally.

OUTDOOR TANKLESS WATER HEATERS

– Install outdoor water heater such that air inlet and flue

outlet are above anticipated snow level.

Venting

24 in. (61 cm), 36 in. (91.4 cm), and 24 in. (61 cm) for a
four-unit installation.

41

INSTALLATION INSTRUCTIONS

Venting for Direct-Vent Water Heater (cont.)

Wall Plate

(recommended)

Venting

12” (30 cm)

Minimum

Exhaust Vent Pipe

Inspection

Access Panel

(Optional)

Upward Slope

to Termination

Air Intake Pipe

Ceiling

Inspection

Access Panel

(Optional)

Horizontal Vent Installation

WARNING:

Danger of fire or bodily injury – Solvent cements and
primers are highly flammable. Provide adequate ventilation
and DO NOT assemble near heat source or open flame. DO
NOT smoke. Avoid skin or eye contact. Observe all cautions
and warnings on material containers.

CAUTION:

Use tankless water heater manufacturer-approved Schedule
40 PVC (foam core is not permitted at any time), Schedule
80 PVC, CPVC, ABS or UL 1738-listed Category III Stainless
Steel or InnoFlue® PP. No other vent material is permitted.
For Canada, installations must follow ULC S636 for exhaust
venting.

Joining Pipes and Fittings

All pipe, fittings, solvent cement, primers, and
procedures, for the U.S., must conform to American
National Standards Institute and American Society for
Testing and Materials (ANSI/ASTM) standards. For
Canada, all pipe, fittings, solvent cement, primers,
and procedures must conform to ULC-S636 and vent
manufacturer specifications.

CAUTIONS:

• DO NOT use solvent cement that has become curdled,
lumpy, or thickened.

• DO NOT thin solvent cement. Observe shelf precautions
printed on the containers.

• For applications below 32°F, use only lower temperature­type solvent cement.

• Appropriate solvent and cleaner must be used for the type
of vent pipe used (PVC, CPVC, or ABS).

Cleaner-Primer and Medium-Body Solvent Cement

All joints in vent piping must be properly sealed, and we
recommend using the following material:

PVC materials should use ASTM D-2564-grade cement.

CPVC materials should use ASTM F-493-grade cement.

ABS materials should use ASTM D-2235-grade cement
(ABS is not allowed for exhaust vent in Canada).

Cementing Joints

1. Cut pipe end square; remove jagged edges and burrs.
Chamfer end of pipe and clean fitting socket and pipe
joint area of all dirt, grease, or moisture.

2. After checking pipe and socket for proper fit, wipe
socket and pipe with cleaner-primer. Apply a liberal
coat of primer to inside surface of socket and outside
of pipe.

3. Apply a thin coat of cement evenly in the socket.
Quickly apply a heavy coat of cement to the pipe and
insert pipe into fitting with a slight twisting motion until
it bottoms out.

4. Hold the pipe fitting for 30 seconds to prevent the
tapered socket from pushing the pipe out of the fitting.

5. Wipe all excess cement from the joint with a rag.
Allow 15 minutes before handling. Cure time will vary
according to fit, temperature, and humidity.

NOTICE:

• Cement must be fluid; if not, recoat with fresh cement.

• Stir the solvent frequently while using. Use a natural

bristle brush or the dauber supplied with the can. The
proper brush size is one inch.

• DO NOT use cement for InnoFlue® PP.

42

INSTALLATION INSTRUCTIONS

Horizontal Vent Installation (cont.)

Fasteners will vary depending on the wall type.

For particle board or

composite sheathing, use
4 hollow wall anchors. The
anchors should be at least 1/8
in. (0.3 cm) in diameter and
the appropriate length for the
sheathing thickness.

For plywood or solid wood

sheathing or members, use 4
#10 x 1 1/4-in. wood screws.

For masonry walls, use

suitable masonry anchors
long enough to pass through
the wall.

NOTICE:

• The exhaust vent terminal must extend a minimum of 12
inches (30.5 cm) more than the air intake terminal from
the exterior wall. Also, an edge to edge distance between
an air intake termination and an exhaust termination
shall be at least 12 inches (30.5 cm) for any directions to
prevent recirculation of vent gases.

• To prevent possibility of condensate freeze-up, DO NOT
install vent kits one above the other.

Once the vent terminal location has been determined,
make holes through the exterior wall to accommodate
the vent pipes. Vent pipes must exit exterior wall
horizontally only.

The standard horizontal air intake termination is a 2-inch
or 3-inch 90 degree elbow. This prevents rain or any
other liquid for getting into air intake and the pipe from
being pushed back into the structure. The standard
horizontal exhaust outlet termination is a 2-inch or 3-inch
pipe which terminates 12 inches from the air intake
termination. Insert a small length of vent pipe through
the wall and connect the coupling. Connect vent cap or
terminal to the vent pipe on the exterior of the building.

1. Observe minimum clearances. Vent terminals must be

a minimum of 5.5 inches (14 cm) and a maximum of
24 inches (61 cm) apart horizontally.

2. Cut two 2 1/2” (6.4 cm) diameter holes [for a 2” (5.1

cm) diameter pipe] or 3 1/2” (8.9 cm) diameter holes
[for a 3” (7.6 cm) diameter pipe] for the exhaust vent
and air intake openings.

1

Apply silicone sealant or silicone/latex caulk to seal
the vent pipe to the vent coupling to permit field
disassembly for annual inspection and cleaning.
Completely seal where it passes through the wall plate
and where it is attached to the structure.

2

Attach the female end of the next vent pipe section to
the male end of the 2-in./3-in. (5.1-cm/7.6-cm) vent pipe.
See “Cementing Joints” on this Use and Care Manual.

2” PVC pipes

Locking bands

3

Insert a 2" PVC pipes slowly into an air intake connector
and a flue connector located on top of the water heater
until they stop. DO NOT use cement. Tighten 2 locking
bands to secure 2" PVC pipes.

Venting

4

Complete the rest of the vent pipe installation to the
water heater's flue outlet and air intake.

43

INSTALLATION INSTRUCTIONS

Exhaust Vent

Pipe

Air Intake

Pipe

Inspection

Access Panel

(Optional)

Inspection

Access Panel

(Optional)

Ceiling

1"

from wall

is recommended

Upward Slope
to Termination

Flat

Termination

Kit

Air Intake

Vent

Exhaust

Vent

Exhaust Vent

Pipe

Air Intake

Pipe

Inspection

Access Panel

(Optional)

Inspection

Access Panel

(Optional)

Ceiling

Upward Slope
to Termination

Venting

For information about termination kits, refer to "If You Need Service" on page 26, "Call for Assistance" for the
telephone number to speak to a Customer Service Representative.

Venting for Direct-Vent Water Heater (cont.)

Alternative Horizontal Vent Installations

Alternative horizontal vent termination kits are commercially available. Please refer to the instruction sheet packaged with
the kit for complete installation instructions.

Concentric Vent
Termination Kit

44

Flat Horizontal
Termination Kit

(this termination can
be rotated)

Front View

Option 1

Terminal assemblies to be parallel to wall�

Exhaust

Vent

Terminal

Optional vent diagram
(no kit required)

Short piece of pipe

(30�5 cm)

12 in�

min�

Combustion

Air-Inlet

Terminal

Exhaust

Vent

Terminal

Front View

Option 2

Terminal assemblies to be parallel to wall�

Short piece of pipe

Combustion

Air-Inlet

Terminal

(30�5 cm) min�

12 in�

Side View

Termination Openings -
12 in� (30�5 cm) min� above
grade or anticipated snow level

INSTALLATION INSTRUCTIONS

Hole

Through Roof

C

L

Hole

Through Ceiling

C

L

A, B

Vertical Vent Installation

WARNING:

Improper vent installation can result in death, personal
injury, product damage, and/or poor performance.

NOTICE:

Only Rheem-approved AND ULC S636 approved termination
and parts must be used during installation.

Maintain the recommended air space clearance to
combustible materials and building insulation.

1

NOTICE:

Free-standing vent pipe that penetrates a roof/ceiling
requires another means of support from a second location.

Venting

4

Determine the vent terminal height and install the
vent pipe accordingly. Refer to “Vertical Vent Terminal
Location” on page 44 for clearance requirements.

Cut a hole through the roof and interior ceiling to
accommodate the vent pipes.

2” PVC pipes

Locking bands

2

Insert a 2" PVC pipes slowly into an air intake connector
and a flue connector located on top of the water heater
until they stop. Tighten 2 locking bands to secure 2"
PVC pipes.

5

Install adequate flashing where the vent pipe passes
through the roof.

3

Support vertical and horizontal runs as described on
page 35. Vertical supports are required every 4 ft. (1.2
m) along a vertical pipe route, after every transition to
vertical, and after every offset elbow.

45

INSTALLATION INSTRUCTIONS

Venting for Direct-Vent Water Heater (cont.)

Vertical Vent Terminal Location

Optional

Venting

12" Min.

(300 mm)

A, B

Air Intake

Vent Pipe

Through Roof

The following chart with diagrams details the minimum dimensional information needed to determine the proper location
of the vertical vent terminal for direct-vent indoor tankless water heaters:

Location U.S. Installation Requirements

A = Minimum clearance above the roof

level.

B = Maximum clearance above roof

level (without additional support for
vent pipe).

C = Required vent clearance from any

gable, dormer, or other roof struc­ture with building interior access
(i.e., vent, window).

D = Required vent clearance from any

forced air inlet, including dryer and
furnace air inlets.

E = Minimum/maximum horizontal dis-

tance between vent terminals

1 In accordance with current ANSI Z223.1/NFPA 54 National Fuel Gas Code.

2 In accordance with current CAN/CSA B149.1 Installation Codes.

12 in. (30 cm) above roof level.

24 in. (61 cm) above roof level.

4 ft. (1.2 m)

10 ft. (3 m)

5.5 in. (14 cm)/24 in. (61 cm)

1

Canadian Installation Requirements

18 in. (45.7 cm) above roof level.

24 in. (61 cm) above roof level.

4 ft. (1.2 m)

6 ft. (1.8 m)

5.5 in. (14 cm)/24 in. (61 cm)

2

46

The vertical intake air termination requires a return bend
or two short or long sweep radius 90° elbows to keep
the inlet downward and prevent entry of rain. Refer to
figure above for the proper location of the air intake with
respect to the exhaust outlet termination.

The vertical exhaust outlet termination is a 2-inch or
3-inch pipe which terminates at least 12 inches (30 cm)
above the air intake termination. The exhaust outlet
terminations must be at least 12 inches (30 cm) in US [at
least 18 inches (46 cm) in Canada] above the roof line or
anticipated snow levels.

INSTALLATION INSTRUCTIONS

Adjustable Roof Flashing

Support Clamp

Upward Slope

Support Hanger

Air Intake

Pipe

Exhaust Vent

Pipe

Optional

Standard Vertical Vent Termination

Venting

To Suitable Drain

47

INSTALLATION INSTRUCTIONS

Support Hanger

Adjustable Roof Flashing

Support Clamp

Air Intake

Pipe

Exhaust Vent

Pipe

Minimum Clearance 18 inches above roof

Concentric Vent Termination

Upward Slope

Venting

Venting for Direct-Vent Water Heater (cont.)

Alternative Vertical Vent Termination

Alternative vertical vent termination kits are commercially available. Please refer to the instruction sheet packaged with
the kit for complete installation instructions.

WARNING:

Under no circumstances should the exhaust pipe and the air intake pipe be connected together.

48

Water Quality

INSTALLATION INSTRUCTIONS

Water quality must be taken into account when installing
and maintaining the water heater. Water conditions
outside of the levels specified below affect and may
damage the water heater. Please note that the limited
warranty provided with the water heater does not
cover defects, malfunctions or failures resulting from
water conditions that are not in accordance with the
specifications in the table below

If you nonetheless install this water heater where the
water conditions are not within the levels specified in
the table below, Rheem recommends that you take the
following steps:

Install a water treatment device or water softener at the
same time as the original installation of the water heater.
Rheem offers a water treatment accessory that can be
installed with the water heater. (See below).

Flush the water heater’s heat exchanger regularly.
Rheem offers a flush kit and isolation valves to help
remove scale build up. (See below)

Chart for Recommended Water Quality Levels

pH

6.5–8.5 Up to 500 mg/L Up to 15 mg/L

Cited reference: National Secondary Drinking Water Regulations

(Total Dissolved

Solids) TDS

Free Carbon

Dioxide (CO2)

Total

Hardness

Up to

200 mg/L

Aluminum Chlorides Copper Iron Manganese Zinc

0.05 to

0.2 mg/L

Up to

250 mg/L

Up to

1.0 mg/L

Up to

0.3 mg/L

0.05 mg/L

Accessory part numbers listed below. See Parts and Accessories Catalog for more information.

Accessory Kit Replacement Filter Tankless Flush Kit Tankless Isolation Valve

AllClear Water Treatment Kit RTG20251 RTG20252

Scale Prevention Device RTG20246 RTG20247

RTG20124 RTG20220AB

Up to

Plumbing

Up to

5 mg/L

Water Supply

Water Supply

CAUTION:

This water heater MUST ONLY be used with the following
water supply conditions to prevent product damage and
operation failure.

• Clean, potable water free of corrosive chemicals, sand,
dirt, and other contaminates.

• Inlet water temperatures above 32°F (0°C), but not
exceeding 120°F (49°C).

• DO NOT reverse the HOT and COLD water connections.

• DO NOT connect this water heater to water lines
previously used for space heating. All water piping and
components shall be suitable for potable water.

• With recommended water quality (See chart above).

49

INSTALLATION INSTRUCTIONS

Thermal Expansion

Determine if a check valve exists in the inlet water line.
Check with your local water utility company. It may have
been installed in the cold water line as a separate back
flow preventer, or it may be part of a pressure reducing
valve, water meter or water softener. A check valve
located in the cold water inlet line can cause what is
referred to as a “closed” water system. A cold water inlet
line with no check valve or back flow prevention device
is referred to as an “open” water system. As water is
heated, it expands in volume and creates an increase
in the pressure within the water system. This action is
referred to as “thermal expansion”. In an “open” water
system, expanding water and the resulting pressure
increase which exceeds the capacity of the water heater,
flows back into the city main where the pressure is easily
dissipated.

Plumbing

A “closed” water system, however, prevents the
expanding water from flowing back into the main
supply line, and the result of “thermal expansion” can
create a rapid and dangerous pressure increase in the
water heater and system piping. This rapid pressure

increase can quickly reach the safety setting of the relief
valve, causing it to operate during each heating cycle.
Thermal expansion, and the resulting rapid and repeated
expansion and contraction of components in the water
heater and piping system can cause premature failure of
the relief valve, and possibility the heater itself.

NOTICE:

Replacing the relief valve will not correct the problem!

The suggested method of controlling thermal expansion
is to install an expansion tank in the cold water line
between the water heater and the check valve.

The expansion tank is designed with a built-in air
cushion that compresses as the system pressure
increases. This relieves the over-pressure condition and
eliminates the repeat operation of the relief valve. For
other approved methods of thermal expansion, contact
an installing contractor, water supplier, or plumbing
inspector.

50

Water Supply Connections

CAUTION:

IMPORTANT—DO NOT apply heat to the HOT or COLD water
connections. If sweat connections are used, sweat tubing
to the adapter before fitting the adapter to the water
connections on the water heater. Any heat applied to the
water supply fittings will permanently damage the internal
components of the water heater.

NOTICE:

In cold environments, ice can accumulate in the water
heater’s connectors. Plug in the water heater power
cord for approximately 10 minutes before making these
connections. This will melt any ice buildup.

Plumbing should be carried out by a qualified plumbing
contractor in accordance with local codes.

Only use approved plumbing materials.

To allow the full flow capacity, it is recommended to
keep water inlet and outlet pipes 3/4" (1.9 cm) diameter
or larger.

To conserve energy and to prevent freezing, insulate
both COLD and HOT water supply lines. DO NOT
insulate the drain line or pressure-relief valve.

Recirculation

Direct recirculation is allowed, provided the loop is
thermostatically controlled, and a timer is used to
turn the pump off during off peak periods. The pump
must be sized for a minimum of 5 gpm at 25 ft of head
plus building head. A 10°F difference between the loop
thermostat setting and water heater temperature setting
must be maintained.

To ensure proper operation of the water heater, follow
these water pressure guidelines.

Operation of the water heater requires a minimum water
pressure of 14 psi (97 kPa) and a minimum water flow
rate of 0.4 gpm (1.5 lpm).

Water pressure of 40 psi (276 kPa) is required to achieve
maximum flow rate.

To maintain proper performance, there must be sufficient
water supply pressure.Required Water Pressure =

Min. Operating Water Pressure (14 psi [97 kPa])

+ Pipe Pressure Loss

+ Faucet Pressure Loss

+ Safety Margin (more than 5 psi [34 kPa]).

To supply HOT water to upper floors, additional water
pressure will be required (0.44 psi [3 kPa] per foot of
height). Calculate the distance between the water inlet of
the water heater (ground level) to the HOT water faucet
farthest away from the water heater (upper floor level).

Well water systems should be set to ensure a minimum
system pressure of 40 psi (276 kPa). The pressure
should remain constant and stable during the operation
of the water heater.

Gravity water pressure is not recommended. When the
water is supplied from a water supply tank, the height
of the tank, the diameter of the supply pipes, and
their relation to water pressure need to be taken into
consideration.

INSTALLATION INSTRUCTIONS

Water Supply Installation

NOTICE:

• Use only Teflon tape on all COLD and HOT water
connections.

• If the water flow resistance of a showerhead is too high,
the burner in the water heater will fail to ignite. Keep
all showerheads clean from debris that could cause
additional pressure drop.

• If using mixing valves on the outlet, choose one that
prevents COLD water pressure from overcoming HOT water
pressure.

• If multiple water heaters are installed in a manifold
system, the water piping MUST be in “parallel” and the
water pressure at each water heater should be 40 psi (276
kPa).

1

Install a COLD water shut-off valve near the inlet line on

the water heater. This valve will be used for servicing and
draining purposes.

NOTICE:

It is not recommended to use pipes with smaller diameters
than the water supply connection of the water heater.

4

Open the shut-off valve in the COLD water Inlet line to
check the water flow through the water heater.

Plumbing

5

Close the shut-off valve and remove, clean, and replace
the water filter.

NOTICES:

• Be sure to connect the COLD water inlet and the HOT
water outlet as shown on the water heater. If reversed,
the water heater will not function.

• The flow rate of HOT water may vary when more than two
faucets (e.g. appliances, fixtures, etc.) are being used
simultaneously.

• The pipes MUST be completely drainable. If the HOT
water faucets are located at a point higher than the water
heater, place a drain valve at the lowest point.

2

Before attaching the water line to the water heater, open
the shut-off valve. Run the water until it has purged all
contaminants (sand, debris, air, caulking, etc.).

3

Install a service valve on the end of the COLD water
supply line and connect it to the water inlet on the water
heater.

It is recommended to use unions and flexible copper
connections at the COLD and HOT water lines. They
allow the water heater to be disconnected easily for
servicing.

Use the following guidelines when connecting the HOT
WATER OUTLET:

Connections between the water heater and point(s) of
use should be as short as possible.

Local codes shall govern the piping used for water
connections.

To conserve energy and to prevent freezing, insulate
both COLD and HOT water supply lines. DO NOT
insulate drain line or pressure-relief valve.

51

INSTALLATION INSTRUCTIONS

Relief
Valve

Union

Union

Cold Water Supply

Shut-O Valve

Cold Water

Supply Inlet

Hot Water

Supply Outlet

Relief Valve

Discharge Line

Pressure

Relief Valve

Pressure

Relief Valve

Cold Water

Service Valve

Cold Water

Service Valve

Water

Inlet

Water

Inlet

Water
Outlet

Water
Outlet

Hot Water

Service Valve

Hot Water

Service Valve

Drain

Drain

Water Piping Arrangement With Service Valve Kit

Service valve kits can attach to all tankless water heater
systems. All kits include two full-port isolation valves
to be used in the COLD and HOT water lines. When
installed, these valves allow one person full diagnostic
testing and ease of flushing the system. Contact your
distributor or place of purchase for availability and
installation information.

Water Supply (cont.)

Plumbing

Relief Valve

A new pressure-relief valve, complying with the Standard
for Relief Valves and Automatic Gas Shut-Off Devices for
Hot Water Supply Systems, ANSI Z21.22/CSA 4.4, must
be installed at the HOT water outlet connection of the
water heater during installation. Local codes shall govern
the installation of any relief valve.

NOTICE:

• The following drawing illustrates a pressure-only relief

•

• Manual operation of relief valves should be performed at

• If the relief valve on the system discharges periodically, a

One end of the relief valve discharge line connects to the
HOT water outlet pipe as shown above. The other end of
the pipe should be routed to a suitable drain to eliminate
potential water damage.

valve. If local codes require a combination temperature
and pressure-relief valve, you may need to install an
extension piece to ensure that the valve probe is not
directly in the flow path of the water.

A pressure relief valve supplied with this water heater must
be installed as shown below.

least once a year.

problem exists. Turn off the water heater, unplug the unit,
and call for service.

For safe operation of the water heater, be sure that:

The pressure rating of the relief valve must not exceed
150 psi (1,034 kPa) or the maximum working pressure
of the water heater. (See the rating plate on the water
heater.)

The BTUH rating of the relief valve must equal or exceed
the BTUH input of the water heater. (See the rating plate
on the water heater.)

No valve of any type should be installed between the
relief valve and the water heater.

Discharge from the relief valve should be piped to a
suitable drain. Piping used should be of a type approved
for the distribution of hot water.

HOT and COLD water lines should be insulated up to
the water heater. See "Water Supply Installation".

The discharge line must be NO SMALLER than the
outlet of the relief valve. The drain line must pitch
downward to allow for complete drainage of the line and
the valve.

The end of the discharge line should not be threaded or
concealed and should be protected from freezing. No
valve of any type, restriction, or reducer coupling should
be installed in the discharge line.

52

INSTALLATION INSTRUCTIONS

Cold Water

Service Valve

Hot Water

Service Valve

Pressure

Relief Valve

Pressure

Relief Valve

Water

Outlet

Water
Outlet

Water

Inlet

Water

Inlet

Drain

Drain

Condensate Drain

Hot and Cold Pipe Insulation Installation

WARNINGS:

• When pipe insulation is not rated for the appropriate
weather conditions, install electric heat tracing or
equivalent to prevent freezing of the pipes.

• DO NOT insulate or block drain valve on the hot outlet
fitting.

• If pipes are allowed to freeze, the water heater and the
pipes may malfunction or leak due to freezing water.

NOTICE:

The hot and cold water supply pipes should be insulated to
provide additional freeze protection.

Condensate

Condensate Drainage

Be sure the condensate runs freely to a drain and does
not accumulate inside the water heater. In cold climates,
precautions may need to be taken to ensure that the
condensate drain does not freeze.

All condensation must be drained and disposed of per
local codes and requirements.

If the condensate drain gets blocked, an error code
will display on the remote control. If this occurs, the
condensate drain must be cleared.

Use only PVC or CPVC pipe or flexible tube for the
condensate drain line.

For increased energy efficiency, use pipe insulation as
shown in the diagram. Insulate the pipes all the way
to the top. DO NOT cover any drain or pressure-relief
valve(s).

Plumbing

The drain pipe (along its entire length) must be at least
the same diameter as the drain line.

The drain line should be as short as possible and have a
downward slope toward the end.

The end of the drain pipe should be open to the
atmosphere. The end should not be under water or other
substances.

DO NOT connect the drain pipe directly to the drain
sewer.

53

INSTALLATION INSTRUCTIONS

Union

Manual Gas
Supply Line

Shut-O Valve

Cap

Sediment Trap

Manual Gas

Shut-O Valve

Gas Supply

Gas Supply System

WARNING:

DO NOT attempt to convert this water heater for use with
a different type of gas other than the type shown on the
rating plate. Doing so could result in death, personal injury,
explosion or fire, product damage, and/or poor operating
conditions or performance.

NOTICE:

• Gas piping shall be in accordance with local utility

company requirements and/or in the absence of local
codes, use the latest edition of National Fuel Gas Code
(NFGC), ANSI Z223.1. In Canada, use the latest edition of
CAN/CSA B149.1, Natural Gas and Propane installation
code.

• Apply a thin coat of pipe compound to all threaded male

ends. Compound must be of the type resistant to the
action of LP gas.

• To ensure proper water heater operation, the gas pipe and

gas meter must be sized correctly.

Gas Supply

• If flexible connectors are used, the minimum inside

diameter must be 3/4" or greater and the rated capacity
of the connector must be equal to or greater than the
BTU capacity of the water heater. See manufacturer
information for the gas connector. Lengths over 36 inches
are not recommended.

• DO NOT use excessive force when tightening the pipe

sections. Excessive force can damage the water heater,
especially when Teflon pipe compound is used.

Gas Piping

Pipe-Sizing Procedure – The gas supply system must
be properly sized to ensure the proper operation
of this tankless water heater as well as all the gas
appliances on the system. Failure to ensure the gas
system, (meter, regulators, and piping) are properly
sized could result in improper operation of this or other
gas appliances. Insufficient gas pressure/supply can
cause pilot outages, lockouts, or operating conditions
that could lead to an appliance failure, improper
combustion, carbon monoxide, sooting, or fire. Gas
line sizing is based on gas type, the pressure drop in
the system, the gas pressure supplied, and the gas line
type. For gas pipe sizing in the United States, refer to
the National Fuel Gas Code, (NFPA 54, ANSI Z223.1).
For Canadian gas pipe sizing, refer to the Natural Gas
and Propane Installation Code CAN/CSA B149.1.

These simplified instructions only address low pressure
gas systems using Schedule 40 Metallic Pipe (Black
Iron). For hybrid gas systems, high pressure main
lines with regulators at the appliances, gas systems
piped with corrugated stainless steel tubing (CSST), or
Propane gas systems.

Determining the required
regulator and gas meter size.

Find the BTU capacity of each appliance on the
system. This information is located on a rating label
attached to the appliance. Total the BTU of all the
appliances together and divide that by the heating
value of the fuel (for natural gas the average is 1,024 or
2,546 for propane). This will give you the total cubic feet
per hour of gas required for the system.

At your gas meter/regulator there will be a rating plate
that gives the cubic feet per hour capacity of that
equipment. If the total gas required for the system is
greater than the rating of the meter/regulator then the
local gas company will need to be contacted in order
to upgrade the meter/regulator for the system.

54

Cubic Feet
Per Hour (CFH) =

Gas Input of

Water Heater (BTU/HR)

Heating Value of Gas (BTU/FT3)

Gas Supply (cont.)

INSTALLATION INSTRUCTIONS

Determining the required pipe size.

The gas system is designed to operate at a certain
maximum pressure drop. A pressure drop greater than
what is permissible can cause operational issues with
the gas appliances. The National Fuel Gas Code (NFPA
54, ANSI Z223.1 2012) allows for three pressure drop
levels, a 0.3 inch W.C., (see table 2); a 0.5 inch W.C.,
(see table 3) and a 3.0 inch W.C., (see table 4) pressure
drop for natural gas. Only a 0.5 inch W.C. pressure drop
is allowable with Propane (see table 5). For Canadian
installations the maximum allowable pressure drop is 0.5
inch W.C., (see table 3).

Measure the inlet gas pressure to the system using
a manometer. For Natural Gas, if the inlet pressure is
less than 8.0 inches W.C. then use Table 2 or 3 for your
gas pipe sizing. Table 4 can only be used if the inlet
gas pressure is 8.0 inches W.C. or greater. Table 4
cannot be used for Canadian installations.

The gas piping system consists of a main trunk line that
runs from the meter/regulator and branch lines that run
from the trunk line to the individual appliances. A branch
may carry gas for more than one appliance.

The trunk line must be sized to carry the entire load
of all the gas appliances on the system. As with
determining the meter/regulator size, total the BTU of all
the appliances together and divide that by the heating
value of the fuel (for natural gas the average is 1,024 or
2,546 for propane). This will give you the total cubic feet
per hour of gas required for the trunk line. Measure the
total length of the line Refer to Table(s) 2, 3, or 4 and find
the number closest to but higher than the total cubic feet
per hour requirement calculation. This will tell you the
minimum size that the trunk line must be.

Each branch line must be sized to carry the load of the
appliance(s) attached to it. If more than one appliance
is on a branch total the BTU and as with the trunk line
divide that by the heating value of the fuel. Refer to
Table(s) 2, 3, or 4 and find the number closest to but
higher than the total cubic feet per hour requirement
calculation for the branch and appliance(s). This will tell
you the minimum size for that branch line and appliance.

Final Considerations

If this water heater is replacing an existing water heater,
it is important to verify the capacity of the gas system.
Check the capacity of the meter/regulator, and verify the
pipe lengths and sizes.

An improperly sized gas system will cause operational
issues with this water heater. Other appliances on the
gas system may be affected as well.

Flexible Gas Connectors may be used however the
BTU capacity of the connector must be checked. Each
connector has a capacity label on it, verify that the
connector has a BTU capacity greater than that of the
water heater. An undersized flexible gas connector will
cause operational issues with this water heater.

Half-inch gas lines are permissible provided the gas
system meets certain requirements. First, the gas

pressure on the system must be 8.0 inch W.C. or
greater. Second the capacity of the pipe as outlined in

Table 4 is followed. If the existing pipes are too small it
could cause a pressure drop greater than 3.0 inch W.C.
and will cause operational issues with this water heater
as well as other gas appliances on the system.

Gas Supply

55

INSTALLATION INSTRUCTIONS

Gas Supply (cont.)

This is an example, in US, refer to current National Fuel
Gas Code, NFPA 54 for correct pipe sizing chart, and
in Canada, refer to current Natural Gas and Propane
Installation Code CAN/CSA B149.1.

Table 2 - Pipe-Sizing - Natural Gas

Schedule 40 Metallic Pipe (Black Iron)
Inlet System Pressure: Less than 2 PSI (55 inches W.C.)
Allowable Pressure Drop: 0.3 inches W.C.
Specific Gravity : 0.60
(Capacity in cubic feet per hour)

Length Pipe Size (Inches)

10 131 273 514 1,060 1,580

20 90 188 355 726 1,090

30 72 151 284 583 873

40 62 129 243 499 747

50 55 114 215 442 662

60 50 104 195 400 600

Gas Supply

70 46 95 179 368 552

80 42 89 167 343 514

90 40 83 157 322 482

100 38 79 148 304 455

Information in this chart obtained from NFPA 54, ANSI Z223.1 - 2012 Table 6.2(a)

Table 4 - Pipe-Sizing - Natural Gas

Schedule 40 Metallic Pipe (Black Iron)
Inlet System Pressure: 8.0 inches W.C. or greater, but Less than 2 PSI (55
inches W.C.)
Allowable Pressure Drop: 3.0 inches W.C.
Specific Gravity : 0.60
(Capacity in cubic feet per hour)

Length Pipe Size (Inches)

10 454 949 1,787 3,669 5,497

20 312 652 1,228 2,522 3,778

30 250 524 986 2,025 3,778

40 214 448 844 1,733 2,597

50 190 387 748 1,536 2,302

60 172 360 678 1,392 2,085

70 158 331 624 1,280 1,919

80 147 308 580 1,191 1,785

90 138 289 544 1,118 1,675

100 131 273 514 1,056 1,582

Information in this chart obtained from NFPA 54, ANSI Z223.1 - 2012 Table 6.2(c)

½ ¾ 1 1¼ 1½

½ ¾ 1 1¼ 1½

Table 3 - Pipe-Sizing - Natural Gas

Schedule 40 Metallic Pipe (Black Iron)
Inlet System Pressure: Less than 2 PSI (55 inches W.C.)
Allowable Pressure Drop: 0.5 inches W.C.
Specific Gravity : 0.60
(Capacity in cubic feet per hour)

Length Pipe Size (Inches)

½ ¾ 1 1¼ 1½

10 172 360 678 1390 2090

20 118 247 466 957 1430

30 95 199 374 768 1150

40 81 170 320 657 985

50 72 151 284 583 873

60 65 137 257 528 791

70 60 126 237 486 728

80 56 117 220 452 677

90 52 110 207 424 635

100 50 104 195 400 600

Information in this chart obtained from NFPA 54, ANSI Z223.1 - 2012 Table 6.2(b)

Table 5 - Pipe-Sizing - Undiluted Propane

Schedule 40 Metallic Pipe (Black Iron)
Inlet System Pressure: 11 inches W.C.
Allowable Pressure Drop: 0.5 inches W.C.
Specific Gravity : 1.5
(Capacity in cubic feet per hour)

Length Pipe Size (Inches)

½ ¾ 1 1¼ 1½

10 291 608 1150 2350 3520

20 200 418 787 1620 2420

30 160 336 632 1300 1940

40 137 287 541 1110 1660

50 122 255 480 985 1480

60 110 231 434 892 1340

80 101 212 400 821 1230

100 94 197 372 763 1140

125 89 185 349 716 1070

150 84 175 330 677 1010

Information in this chart obtained from NFPA 54, ANSI Z223.1 - 2012 Table 6.3(d)

56

Gas Supply (cont.)

Gas Supply Installation

INSTALLATION INSTRUCTIONS

1

Install the manual gas appliance shut-off valve to the gas
connection at the water heater. The shut-off is supplied
with the water heater.

2

Install a ground joint union or ANSI design-certified
semi-rigid or flexible gas appliance connector to the
open end of the manual gas appliance shut-off valve.
The NFGC, ANSI Z223.1 and CAN/CSA B149.1 codes
mandate the use of manual gas shut-off valve.

4

Using the proper-size piping, fittings, and components,
build the gas supply line to the water heater.

NOTICE:

The gas supply line should be a minimum of 3/4-in. (1.9-cm)
black steel pipe or other approved gas piping material.

5

Install a sediment trap at the lowest portion of the gas
line.

The inlet gas pressure to the water heater must NOT
exceed 10.5 in. w.c. (2.6 kPa) for natural gas and
13 in. w.c. (3.2 kPa) for LP gas. For purposes of input
adjustment, the minimum inlet gas pressure (with main
burner on) is shown on the water heater rating plate. If
high or low gas pressures are present, contact your gas
supplier for correction.

Gas Supply

3

Install a manual gas supply line shut-off valve
to the end of the gas supply line.

57

INSTALLATION INSTRUCTIONS

Leak Testing

WARNING:

Never use an open flame to test for gas leaks, because
death, personal injury, and/or property damage can result.

The water heater and its gas connections MUST be leak­tested at normal operating pressures before the unit is
placed in operation. These tests should also include all
factory connections.

• Turn on the gas shut-off valve(s) to the water heater.

• Use a soapy water solution to test for leaks at all
the connections and fittings. If bubbles are seen,it
indicates a gas leak that must be corrected.

• Contact a qualified service technician.

Gas Supply

Pressure Testing the Gas Supply System

WARNING:

If inlet gas pressure is out of allowable range [4.0” w.c.
(1.0kPa) – 10.5” w.c. (2.6kPa)] for Natural Gas, or [8.0”
w.c. (2.0kPa) – 13.0” w.c. (3.2kPa)] for LP gas, a gas
pressure regulator must be installed to maintain the
allowable inlet gas pressure.

The water heater and its manual gas shut-off valve
must be disconnected from the gas supply piping
system during any pressure testing of the system at test
pressures in excess of 1/2 psi (3.5 kPa).

The water heater must be isolated from the gas supply
piping system by closing the manual gas shut-off valve
during any pressure testing of the gas supply piping
system at test pressures equal to or less than 1/2 psi
(3.5 kPa).

58

Gas Supply (cont.)

INSTALLATION INSTRUCTIONS

High-Altitude Installation

The water heater is certified for installations up to
2000 ft. (610 m) above sea level. The input rating of this
water heater is based on sea level operation. At higher
elevations, the actual input rate may be lower than the
value listed on the rating label due to the derating of
Natural Gas and LP Gas.

Electrical Wiring

DANGER:

Shock Hazard – Before servicing the water heater, turn
off the electrical power to the water heater at the main
disconnect or circuit breaker. Failure to do so will result in
death or serious personal injury.

WARNING:

Field wiring connections and electrical grounding must
comply with local codes or, in the absence of local codes,
with the latest edition of the National Electrical Code, ANSI/
NFPA 70, or in Canada, Canadian Electrical Code, CAN/CSA
C22.1, Part 1.

NOTICE:

For installations above 2000 ft. (610 m) elevation, contact
a qualified service technician to make the proper altitude
adjustments. See “High Altitude DIP Switch Adjustments”
for additional information.

WARNING:

DO NOT install this water heater at elevations above 2000
ft. (610 m) without the proper adjustments. Please contact
your installer, local gas supplier, place of purchase, or the
Rheem Customer Service phone number listed in the “Call
for Assistance” section.

DO NOT use 3-prong to 2-prong adapters. DO NOT
use power strips or multiple outlet adapters.

All direct-vent gas models come with a 3-prong
power cord. Only use this power cord and a matching
grounded electrical outlet.

All outdoor gas models DO NOT come with a power
cord. Only hard-wire to an appropriate power outlet with
a ground terminal.

Keep any excess length of the power supply cord on the
outside of the water heater.

If local codes require hard-wiring, see instructions for
“Hard-Wiring the Electrical Connections” below.

Gas Supply

Electrical

CAUTION:

Label all wires prior to disconnecting
Wiring errors can cause personal injury, product damage,
and/or dangerous operating conditions. Verify correct
operation after servicing.

is recommended

.

NOTICE:

• DO NOT connect power until venting installation is
complete (see Venting Installation).

• Wait ninety (90) seconds after power is connected for the
first time to initiate operation of the water heater.

Power consumption is up to 100 Watts during normal
operation, 3-5 Watts during standby, waiting to run, and up
to 200 Watts during the freeze protection operation.

Power Cord

The electric power supply requirement for this water
heater is 120 VAC/60 Hz, 2 amps.

A dedicated circuit is recommended for the water heater.
DO NOT connect to a GFCI or AFCI circuit. Multiple
units may be connected to a single circuit up to the
circuit rating.

Hard-Wiring the Electrical
Connections

Wiring should be performed by a qualified electrician in
accordance with local codes.

The water heater requires a properly grounded
120 VAC/60 Hz dedicated power supply. Multiple water
heaters may be connected to a single circuit up to that
circuit’s rating.

DO NOT connect grounding wire to water pipes, gas
pipes, telephone cables, lighting conductor circuits, or to
any other grounding circuits that require a GFCI or AFCI
(arc fault circuit interrupter).

An ON/OFF switch must be provided and installed for
the incoming 120 VAC power supply.

Wire the water heater exactly as shown in the wiring
diagram. This wiring diagram can also be found inside
the water heater cover panel.

The green screw is provided in the enclosure for a
grounding connection.

Connect the live wire to the black wire and neutral wire
to the white neutral wire.

59

INSTALLATION INSTRUCTIONS

Wiring Diagram

Electrical

60

INSTALLATION INSTRUCTIONS

Electrical Wiring (cont.)

Remote Control Selection and Location

WARNING:

Field wiring connections and electrical grounding must
comply with local codes or, in the absence of local codes,
with the latest edition of the National Electrical Code, ANSI/
NFPA 70, or in Canada, Canadian Electrical Code, CAN/CSA
C22.1, Part 1.

NOTICE:

The provided remote control will allow maximum temperature
settings of 120°F (49°C). Temperatures up to 140°F (60°C) for
residential applications and up to 185°F (85°C) for commercial
applications* can be achieved with the MAIN (UMC-117)
remote control. Only qualified service personnel should
perform this adjustment.

• An optional cable (EZ Link CableTM)
can be purchased separately to
manifold two water heaters together.

• DO NOT attempt to disassemble a
remote control. All controls are
sealed and calibrated for accurate
water heater control and operation.

Review the following considerations before determining the
location of the remote control(s):

• DO NOT install any remote control
outdoors or where it can come in contact
with water.

•

Avoid installing the remote control in the
following areas and/or conditions:
– area exposed to heat.
– area exposed to steam.
– area exposed to oil.
– area exposed to direct sunlight.
– areas near stored or used

flammable products.

Place remote control out of children’s reach.
The remote control should be installed in a convenient

location (e.g., kitchen, laundry room, utility room, or
directly next to the water heater).

The maximum distance between the water heater and
the remote control installation location is limited to 195 ft.
(59 m) of wire.

One remote control is provided with the water heater.
Additional remote controls may be purchased
separately. The available remote controls are listed in the
following chart. Up to three remote controls can be used
with the water heater. No other manufacturer’s controls
are suitable for use with this water heater.

Remote Control
Model Number

UMC-117 MAIN

USC1-117

USC2-117 BATH 2

MIC-6 or MIC-185**
Manifold System

*A commercial conversion kit can be purchased to achieve temperatures up to 185°F (85°C).
**When a manifold system is installed, the main remote control connected to the manifold controller
(MIC-6 or MIC-185) has priority over the remote controls connected to the water heater.

Remote Control
Description

BATH 1

Manifold System Optional (Sold Separately)

Temperature
Set Point Range Availability

100°F–120°F (38°C–49°C)

85°F (29°C)
125°F–140°F (52°C–60°C)

85°F (29°C)
125°F–185°F (52°C–85°C)

100°F–120°F (38°C–49°C)

85°F (29°C)

100°F–120°F (38°C–49°C)

85°F (29°C)

Factory Default

Qualified Technician
Adjustment for Residential Products

Qualified Technician
Adjustment for Commercial Products*

Optional (Sold Separately)

Qualified Technician Adjustment

Optional (Sold Separately)

Qualified Technician Adjustment

Electrical

61

INSTALLATION INSTRUCTIONS

Remote Control Installation

WARNING:

Field wiring connections and electrical grounding must
comply with local codes or, in the absence of local codes,
with the latest edition of the National Electrical Code, ANSI/
NFPA 70, or in Canada, Canadian Electrical Code, CAN/CSA
C22.1, Part 1.

NOTICE:

Remote control cable needs to be type CL3R/CMR shielded
security wire equivalent (18 AWG) and need not to be
polarity-sensitive.

It is not recommended to have wiring exposed.

DO NOT apply sealant to remote control cable.

DO NOT use network cable, telephone wire, or any twisted­pair cable.

Connecting the MAIN (UMC-117) Remote Control to a
Wall:

Drill a 1- to 1 1/2-in. (2.5/3.8-cm) hole at the proposed
control location. Install the remote control cable between

Electrical

the location of the remote control and the water heater.

4

Install the base plate to the wall using suitable screws
and wall anchors.

NOTICE:

The tabs on the base plate should always point out.

5

Connect the remote control to the remote control cable.

1

6

62

2

Remove the remote control from the base plate.

3

Feed the remote control cable through the large center
hole in the base plate.

Position the remote control on the base plate.

NOTICE:

The tabs on the base plate should line up with the slots on
the back of the remote control.

Secure the remote control to the base plate with one screw
into the bottom tab.

NOTICE:

DO NOT attempt to connect the remote control or control
wire to the water heater while the water heater has power
applied to it. Damage to the water heater will occur. DO
NOT cut or strip the wiring while it is connected to the
water heater or while the water heater has power applied
to it.

INSTALLATION INSTRUCTIONS

Remote Control

Connection Cover

Remote Control

Connection Cover

Electrical Wiring (cont.)

Connecting the Remote Control to the Water Heater:

1

Ensure that the power to the water heater has been
disconnected.

4

Firmly tighten the terminal screws by hand.

5

2

Loosen the one screw located on the remote control
connection cover. The connection cover is made of
white plastic.

NOTICE:

DO NOT REMOVE FRONT PANEL. Remote control wires are

connected on the bottom of the unit.

There are NO accessible remote control terminals inside
the water heater.

3

Connect the remote control extension cables from
the remote control to the remote control connection
terminals.

Secure the remote control extension cable on the hook
located on the side of the remote control connection
base.

Electrical

6

Reinstall the remote control connection cover and
secure with the one screw.

NOTICE:

DO NOT connect power until venting installation is

complete.

NOTICE:

The remote control wire connection terminals are not
polarity-sensitive.

7

Switch on the power supply to the water heater.
Check for proper operation of the remote control and the
water heater.

63

Insulation Blankets

!

INSTALLATION INSTRUCTIONS

In general, insulation blankets for external use on gas
water heaters are not necessary. The purpose of an
insulation blanket is to reduce the standby heat loss
from the water heater’s storage tank. Since these water
heaters DO NOT store water, they eliminate the need for
the insulation blanket.

Never cover the air inlet, flue outlet, or operating and
warning labels attached to the water heater. Covering these
components will cause dangerous operating conditions that
can lead to death, personal injury, property damage, and/or
product damage.

Installation Precautions

Follow all installation instructions covered in this manual.

Check the inlet gas pressure to make sure it is within the
range specified on the rating plate.

Make sure there is adequate air for combustion and
ventilation as described on "Venting" in this manual.

Maintain proper clearances to combustibles and
noncombustibles as specified on the rating plate.

Make sure the venting system complies with local
codes, National Fuel Gas Code (ANSI Z223.1/NFPA 54)

Checklist

or Natural Gas and Propane Installation Code (CAN/CSA
B149.1), and the guidelines found on "Venting" in this
manual.

Make sure the heater and remote control are properly
fastened to their mounting surfaces.

Make sure the heater and remote control are wired in
accordance with all regulations and codes without any
exposed connections.

WARNING:

The manufacturer’s warranty does not cover any
damage or defect caused by insulation, insulation
attachment, or use of any type of energy-saving or
other unapproved devices (unless authorized by the
manufacturer). The use of unauthorized energy-saving
devices can result in death, personal injury, and/or
property damage. The manufacturer disclaims any
responsibility for such loss or injury resulting from the
use of such unauthorized devices.

Contact the local gas company to make sure the gas
meter and gas piping are adequately sized.

Use only Teflon tape on all male water line connections
and fittings.

DO NOT block or restrict any outside air intake
openings.

DO NOT remove the front cover unless absolutely
necessary. This should only be done by a qualified
service technician.

DO NOT install this product where standing water may
occur.

DO NOT use pipe dope on water line connections and
fittings.

DO NOT use Teflon tape on gas line connections and
fittings in US.

64

INSTALLATION INSTRUCTIONS

Installation Checklist

A. Water Heater Location

Indoor water heaters must be installed indoors.

Outdoor water heaters must be installed outdoors.

Close to area of ventilation termination (indoor
models).

Protected from freezing temperatures.

Proper clearance from combustible material
observed.

Sufficient fresh air supply for proper operation of
water heater.

Air supply free of corrosive elements and
flammable vapors.

Provisions made to protect area from water
damage.

Sufficient room to service heater.

Combustible materials, such as clothing, cleaning
materials, and rags clear of the heater and vent
piping.

Water heater is properly secured to the wall.

C. Water Supply/Relief Valve

Water supply has sufficient pressure.

Air has been purged from the water heater and the
piping.

Water connections tight and free from leaks.

Water filter is clean and in place.

All piping has been assembled as described on
"Water Supply".

Water pipes are insulated and protected from
freezing, if necessary.

Pressure-relief valve properly installed with
discharge line running to open drain.

Discharge line protected from freezing, if
necessary.

D. Gas Supply

Gas type matches listing on rating plate.

Gas supply pressure is sufficient for the water
heater.

Gas line equipped with shut-off valve, union and
sediment trap as described on "Gas Supply
System".

Electrical

B. Vent (Indoor Models)

Vent pipe material is ULC S636 approved and
manufacturer-approved.

Horizontal air intake pipe and exhaust pipe have
a 1/4" per foot UPWARD slope toward the vent
terminal.

Vertical venting is installed as described on
"Vertical Vent Installation.

Connection(s) securely fastened together with
cement and airtight.

All vent runs are properly installed.

Vent terminal is properly installed.

Maximum vent length is observed.

DIP Switches are properly adjusted per vent length
and elevation

Approved pipe-joint compound has been used on
all gas pipe connections.

All connections and fittings have been checked for
leaks with a soapy water solution.

Gas company inspected installation (if required).

E. Electrical Wiring

Supply cord and/or wiring meets all local codes,
National Electrical Code, ANSI/NFPA 70, in the
U.S., or Canadian Electrical Code, CAN/CSA
C22.1, Part 1, in Canada.

Voltage matches listing on rating plate.

Water heater is properly grounded.

F. Condensate

Condensate drain is properly installed.

65

INSTALLATION INSTRUCTIONS

Cold Water

Supply

Potable Water

Expansion Tank

(2 gallons)

Tankless

Water Heater

Air Handler

Union

Cold Water Supply

Shut-O Valve

Check

Valve

Gas Supply

Line

Drain Valve

Tempering

Valve

Tempered

Water

Shut-O

Valve

Air

Separator

Relief
Valve

Piping for Space Heaters

Local codes or plumbing authority requirements may vary
from the instructions or diagrams provided in this manual
and take precedence over these instructions.

Combination Potable and Space
Heating Application

DANGERS:

When this system requires water for space heating at
elevated temperatures (above 125°F [52°C]), a mixing or
tempering valve MUST BE installed in the hot water supply
line to the house in order to reduce the scald hazard
potential.

Any piping or components used in the installation of
this water heater in a combination potable and space
heating application must be suitable for use with
drinking water.

Typical Combination Installation

If this water heater is installed in an application intended
to supply domestic hot water needs and hot water
for space heating purposes, DO NOT connect the
heater to an existing heating unit or components of a
heating system that have previously been used with a
nondrinking water system.

Toxic chemicals such as those used for boiler treatment
may be present and will contaminate the drinking water
supply causing possible health risks. Never introduce
toxic chemicals, such as glycol and those used for boiler
treatment, into this system.

This water heater is NOT approved as the dedicated
space heating unit.

This water heater must be used for combination
applications with air handler only and not for indoor
heating applications.

Space Heater

66

(Pump included)

Recirculation Control

Remote
Control

Hot Water

to Fixtures

Hot Water

Loop

Dedicated

Return Line

Circulation

Pump with built

in check valve

Expansion

Tank

Wire to Connect

Pump to heater

(8 ft long)

Cold water

to Tankless

Cold Water

Supply

(Copper Pipe)

Check
Valve

Shut off

Valve

(Copper Pipe)

Optional Shut

off valve

INSTALLATION INSTRUCTIONS

Local codes or plumbing authority requirements may
vary from the instructions or diagrams provided in this
manual and take precedence over these instructions.

Your tankless water heater has the ability to control an
external recirculation pump. Two modes are available,
Energy Saver and Performance, which recirculate the
water in the plumbing system to provide hot water more
quickly when a faucet is opened. Rheem offers a fully
packaged recirculation pump kit. See the Parts and
Accessories catalog for more information.

NOTICE:

Recirculation control is for residential application only.
Recirculation control cannot be used with an air handler
or with multiple water heater installations. The maximum
temperature setting is 140°F (60°C) in recirculation control.

Typical Recirculating Pump Installation

Pump Requirements

Voltage: 120V, 60Hz
In-rush current: Less than 2.5 amps
Amperage: less than 2.0 amps

WARNING:

A control board can be damaged if amperage exceeds 2.0
amps.

Pump Size

The pump should be sized for about 2.5 gpm at the
pressure drop through the tankless water heater and
the supply and return plumbing in the recirculation loop.
Contact service department listed on page 26 of this use
and care manual if you need more information.

3

Recirculating Pump

67

Control

Board

PUMP

Add

4 Amp

Fuse

Blue

connector

Cut blue connector

and splice wires.

BK

W

Ground

INSTALLATION INSTRUCTIONS

Recirculation Control (cont.)

Installation

1

Disconnect all electric power to the water heater.

5

To connect to the pump, cut the blue connector, splice
the wires, and add a 4 amp fuse to the hot wire of the
pump. Rheem recirculation pump kit includes a molex
connector and a 4 amp fuse so splicing wires is not
required.

2

Remove the front cover panel on the water heater.

Install the recirculation pump on the return line

according to the pump manufacturer installation
instructions. Install a check valve in the return line as
shown in typical recirculation pump installation if one is
not integrated into the pump. See "Typical Recirculation

Pump Installation".

* Check valve is included in Rheem recirculation pump

kit.

3

Control

Board

Recirculating Pump

4

68

The wire harness for the recirculation pump is bundled
with the wire harness from the control board. Find a blue
connector with a black and a white wire.

BK

W

Blue

connector

6

Connect the ground wire from the pump to a screw at
the base of the water heater cabinet.

NOTICE:

Follow any applicable electrical code and the pump
manufacture installation instruction referring to the
Pump Electrical Connection Diagram in Step 5 of these
instructions.

Dip Switches

Control

7

Find DIP Switch 2 in the top-right portion of the control
board. The switch labeled “DIP 2” is the bottom switch.

Board

INSTALLATION INSTRUCTIONS

Recirculation Control (cont.)

Turn On the remote control. The pump and water heater
will turn on to raise recirculation loop temperature.

Recirculation Operation

As set
from factory

8

The factory setting for this switch should all be in the
OFF position (DOWN).

The water heater is turned ON when the recirculation

pump starts operation. The water heater produces
hot water at the setting temperature. When the return
water temperature reaches approximately 15°F
below the setting temperature, the water heater and
the pump will turn OFF. The cycle will restart at the
approximate time interval in the table below based on

the temperature thermistor readings.

Energy Saver Mode

The Energy Saver mode operates as follows:

• Less energy consumption due to fewer pump cycles

• Pump cycles ON every 30 to 69 minutes

9

Change the first switch on “DIP 2” to the ON position
(UP). Performance mode is selected.

10

To select Energy Saver mode, change the fourth switch on “DIP 1” to
the ON position (UP)�

11

Replace the front cover panel.

Performance Mode

The Performance mode operates as follows:

• Higher energy consumption due to more pump
cycles

• Pump cycles ON every 15 to 35 minutes

Setting Temp Typical Pump ON Intervals [Min]

[°F]

140 15 30

135 15 30

130 15 30

125 15 30

120 16 31

118 17 33

116 18 35

114 19 38

112 20 40

110 22 44

108 24 47

106 26 51

104 28 56

102 31 62

100 35 69

Performance Energy Saver

Recirculating Pump

12

Turn on all electric power to the water heater.

Actual pump ON intervals may vary based on the setting

temperature, insulation, and heat loss in the system.

69

INSTALLATION INSTRUCTIONS

Activating the Water Heater

WARNING:

Before operating this water heater, be sure to read and
follow the instructions on the following label, all labels on
the water heater, and the “Important Safety Information”
section in this manual. Failure to do so can result in unsafe
operating conditions that can result in death, personal
injury, property damage, and/or product damage.

FOR YOUR SAFETY READ BEFORE OPERATING

WARNING : If you do not follow these instructions exactly, a fire or explosion may result

causing property damage, personal injury or loss of life.

1.STOP! Read the safety information above on this label.

2.Turn off all electric power to the appliance.

3.DO NOT attempt to light the burner by hand.

4.Turn the Gas Shutoff Valve located on the outside of the unit
clockwise to the "OFF" position.

Start/Adjust

70

5.Wait five (5) minutes to clear out any gas. If you then smell gas, STOP! Follow "B" in
the safety information above on this label. If you don't smell gas, go to the next step.

6.Turn the Gas Shutoff Valve located on the outside of the unit counterclockwise to
the "ON" position.

7.Turn on all electric power to the appliance.

8.If the appliance will not operate, follow the instructions "To Turn Off Gas To Appliance"
and call your service technician or gas supplier.

1.Turn off all electric power to the appliance if service is to be performed.
.

Turn the Gas Shutoff Valve located on the outside of the unit clockwise to the "OFF" position.

2

OPERATING INSTRUCTIONS

GAS SHUTOFF

VALV E

OPEN CLOSE

TO TURN OFF GAS TO APPLIANCE

INSTALLATION INSTRUCTIONS

Activating the Water Heater

Operating Instructions

Read, understand, and follow the safety information
listed on the operating label and in the “Important Safety
Information” section in this manual.

Turn on all electric power to the water heater. The water
heater burner will automatically light when there is a
demand for hot water.

4

1

Disconnect all electric power to the water heater.

2

Turn the gas shut-off valve clockwise to the OFF
position. This valve is located on the outside of the water
heater. Wait 5 minutes to clear any gas. If you don’t smell
gas, proceed to Step 3.

NOTICE:

If you smell gas, STOP and follow the safety instructions
listed under B on the operating label or on the front cover
of this manual.

WARNING:

DO NOT attempt to light the burner by hand. Lighting the
burner by hand is an unsafe operating condition that can
result in death, personal injury, property damage, and/or
product damage.

If the water heater burner will not light, turn off the
water heater as described below and call your service
technician or gas supplier.

Shutting Off the Water Heater

1

Disconnect all electric power to the water heater.

Start/Adjust

3

Turn the gas shut-off valve counterclockwise to the ON
position.

2

Turn the gas shut-off valve clockwise to the OFF
position.

71

INSTALLATION INSTRUCTIONS

The contents on pages 72 through 80 should only be performed by qualified service personnel.

Setting the Water Temperature

WARNING:

Improper adjustment, alteration, service, or maintenance
can result in death, personal injury, property damage, and/
or product damage.

Maximum Temperature Adjustment
by the Main Remote Control (UMC–

117)

DANGER:

Water temperatures above 125°F (52°C) will result in death
and/or severe burns from scalding.

WARNING:

Refer to chart below and the scald potential warnings
on page 4 on this manual before making an adjustment.
Changing this setting is done at your own risk.

Time/Temperature Relationship in Scalds

Water Time to Produce
Temperature a Serious Burn

120°F (49°C) More than 5 minutes
125°F (52°C) 1 1/2 to 2 minutes
130°F (54°C) About 30 seconds
135°F (57°C) About 10 seconds
140°F (60°C) Less than 5 seconds
145°F (63°C) Less than 3 seconds
150°F (66°C) About 1 1/2 seconds
155°F (68°C) About 1 second

Table courtesy of Shriners Burn Institute

Priority

Indicator

In-Use

Indicator
(Lit during
operation)

Temperature

Adjustment

LED Display

(Displays

water

temperature

and error

codes)

To change the temperature settings up to
140°F (60°C):

Buttons

ON/OFF

Button and

Indicator

1

Turn on the remote control.

2

Turn off the gas and water to the water heater by closing
the shut-off valves.

Residential water heater temperatures can be adjusted
up to 140°F (60°C). DO NOT perform the following
adjustment if a setting of up to 140°F (60°C) is not
required.

Start/Adjust

Temperature Conversion Chart °F/°C

85 100 102 104 106 108 110 112 114 116
29 38 39 40 41 42 43 44 46 47

118 120 125 130 140 150 160 170 185 °F

48 49 52 54 60 66 71 77 85 °C

72

3

Press the UP adjustment button repeatedly until 120°F
(49°C) shows in the LED display. Hold the UP button
until the “120” on the display starts to blink.

NOTICE:

LED display only shows °F.

INSTALLATION INSTRUCTIONS

Setting the Water Temperature (cont.)

4

While “140” is blinking, press the UP and DOWN
adjustment buttons at the same time. “140” will appear
without blinking.

5

Press the UP or DOWN adjustment button to set the
desired temperature.

6

Turn on the gas and water to the water heater by
opening the shut-off valves.

To limit maximum water temperature setting to 120°F
(49°C):

3

Press the DOWN adjustment button repeatedly until
100°F (38°C) or 85°F (29°C) shows in the LED display.
Hold the DOWN button until the number on the display
starts to blink.

4

While the number is blinking, press the UP and DOWN
adjustment buttons at the same time. The number will
stop blinking.

5

Press the UP or DOWN adjustment button to set the
desired temperature.

1

Turn on the remote control.

2

Turn off the gas and water to the water heater by closing
the shut-off valves.

6

Turn on the gas and water to the water heater by
opening the shut-off valves.

Start/Adjust

73

INSTALLATION INSTRUCTIONS

Setting the Water Temperature (cont.)

Minimum Temperature Adjustment
by the Main Remote Control (UMC–
117, USC1–117, and USC2–117)

Residential water heater temperatures can be adjusted
down to 85°F (29°C), when required.

To change the temperature settings down to
85°F (29°C):

1

Turn on the remote control.

2

Turn off the gas and water to the water heater by closing
the shut-off valves.

3

Press the DOWN adjustment button repeatedly until
100°F (38°C) shows in the LED display.

NOTICE:

LED display only shows °F.

4

Press the DOWN adjustment button 3 times within 5
seconds. The display will show “85.”

5

Turn on the gas and water to the water heater by
opening the shut-off valves.

High-Altitude DIP Switch Adjustments

When the water heater is installed above 2000 ft. (610
m), the settings on the DIP switch located on the control

Start/Adjust

board need to be changed per vent length and altitude.
If these settings are not changed, the water heater may
not function properly.

NOTICE:

If the water is installed under 2000 ft. (610m) altitude, refer
to "Vent Lengths and DIP Switch Adjustments".

74

NOTICE:

The maximum flow rate at 85°F (29°C) is 1.3 gpm (5.0 L/m).

Verify the altitude that the water heater is installed.

1

Turn off the gas and water to the water heater by closing
the shut-off valves.

INSTALLATION INSTRUCTIONS

High-Altitude DIP Switch Adjustments (cont.)

6

If your vent lenth is relatively longer, B-2 setting is
required. Change, the second switch on "DIP 2" to the
ON position (UP).

2

Remove the front cover panel on the water heater.

7

If altitude is above 5,400 ft. (1650 m) and below 8,500 ft.
(2590), change the fourth switch to the ON position (UP).
C-1 setting completes.

Dip Switches

Control

3

Find DIP Switch 2 located in the top-right portion of the
control board. The switch labeled “DIP 2” is the bottom
switch.

Board

As set
from factory

4

The factory settings for this switch should all be in the
OFF position (DOWN).

8

If your vent lenth is relatively longer, C-2 setting is
required. Change, the second switch on "DIP 2" to the
ON position (UP).

NOTICE:

DO NOT alter any other DIP switch settings. The manifold
pressure will be reduced accordingly.

Some models are not available at higher than 5400 ft
(1650m). Please contact technical service listed on page
26 of this use and care manual if you have any questions
of high altitude DIP switch adjustments.

Start/Adjust

5

If altitude is above 2000 ft. (610 m) and below 5,400 ft.
(1650 m), change the third switch on “DIP 2” to the ON
position (UP). B-1 setting completes.

9

Replace the front cover panel.

75

INSTALLATION INSTRUCTIONS

High-Altitude DIP Switch Adjustments (cont.)

WARNING:

This water heater requires the correct DIP switch
adjustments per vent length and altitude for proper
operation. Incorrect DIP switch adjustments may cause

10

Turn on the gas and water to the water heater by
opening the shut-off valves.

Minimum / Maximum vent lengths at B-1, B-2, C-1
and C-2 setting are as follows:

Minimum Vent Length (intake/out­let) each at B-1 and C-1 Setting

Number of
90° Elbows

1 1.0 ft (0.3 m)

Maximum Length of 2"
or 3" Straight Pipe

improper water heater operation resulting in serious injury
or death.

NOTICE:

It is recommend to have a vent length as short as possible.
Input rate at high altitude naturally is derated. In addition
to that, input rate of the water heater decreases more if
there is restriction (pressure drop) in the venting system.
Refer to input rate reduction table due to vent length on
page 36. Actual input rate reduction may be different at
each installation.

Maximum Vent Length (intake/out­let)each at B-1 and C-1 Settings

Number of
90° Elbows

1 22.0 ft (6.7 m) 148.5 ft (45.3 m)

2 19.0 ft (5.8 m) 147.0 ft (44.8 m)

3 16.0 ft (4.9 m) 145.5 ft (44.3 m)

4 13.0 ft (4.0 m) 144.0 ft (43.9 m)

5 10.0 ft (3.0 m) 142.5 ft (43.4 m)

6 7.0 ft (2.1 m) 141.0 ft (43.0 m)

Maximum Length of 2"
Straight Pipe

Maximum Length of 3"
Straight Pipe

Minimum / Maximum Vent Length
(intake/outlet)each at B-2 and
C-2 Settings

Number

of 90°

Elbows

Minimum Length of

2" Straight Pipe

1 22.0 ft (6.7 m) 57.0 ft (17.4 m) Not allowed

2 19.0 ft (5.8 m) 54.0 ft (16.5 m) Not allowed

3 16.0 ft (4.9 m) 51.0 ft (15.5 m) Not allowed

4 13.0 ft (4.0 m) 48.0 ft (14.6 m) Not allowed

5 10.0 ft (3.0 m) 45.0 ft (13.7 m) Not allowed

6 7.0 ft (2.1 m) 42.0 ft (12.8 m) Not allowed

Maximum Length of

2" Straight Pipe

3" Pipe

76

INSTALLATION INSTRUCTIONS

Control Board

Dip Switches

Water Saving Control

Water saving control is optional and is inactive as
default. To activate this control, appropriate procedures
must be followed.

Water saving control can reduce waste water at initiation
of hot water demand by reducing flow until outlet hot
water reaches set temperature. It is recommended to
turn ON this control if the water heater is installed in a
drought area or anywhere water conservation is needed.

Follow the steps below to turn ON the water saving
control.

1

4

Change the third switch on “DIP 1” to the ON position
(UP).

Turn off the gas and water to the water heater by closing
the shut-off valves.

2

Remove the front cover panel on the water heater.

5

Replace the front cover panel.

6

Turn on the gas and water to the water heater by
opening the shut off valves.

Follow the below steps to turn OFF the water saving
control.

1

Turn off the gas and water to the water heater by closing
the shut-off valves.

3

Find DIP Switch 1 located in the top-right portion at
the control board. The switch labeled “DIP 1” is the top
switch.

Start/Adjust

77

INSTALLATION INSTRUCTIONS

Control Board

Dip Switches

Water Saving Control (cont.)

2

Remove the front cover panel on the water heater.

3

Find DIP Switch 1 located in the top-right portion at
the control board. The switch labeled “DIP 1” is the top
switch.

4

Change the third switch on “DIP 1” to the OFF position
(DOWN).

5

Turn on the gas and water to the water heater by
opening the shut-off valves.

Start/Adjust

78

INSTALLATION INSTRUCTIONS

MIN

MAX

ADJ

Control Board

Dip Switches

MIN

MAX

ADJ

Maintenance Notice

Maintenance notice is an optional control and is inactive
as default. Maintenance notice reminds users of water
heater maintenance activities such as flushing the heat
exchanger or replacing the water treatment filter (if
applicable) in order to maximize the life of your tankless
water heater. Contact technical service department listed
on page 26 of this use and care manual if you are not
familiar with these maintenance activities.

As set
from factory

1

Turn off the remote control.

2

Turn off the gas and water to the water heater by closing
the shut-off valves.

5

The factory settings for this switch should all be in the
OFF position (DOWN).

MIN MAX ADJ

6

Change the third and fourth switches on “DIP 2” to the
ON position (UP).

3

Remove the front cover panel on the water heater.

4

Find DIP switch 2 located in the top-right portion of the
control board. The switch labeled “DIP 2” is the bottom
switch.

7

Push and hold “Max” button until “ON” is shown on the
display of the remote control.

Start/Adjust

8

Change the third and fourth switches on “DIP 2” to the
OFF position (OFF).

79

INSTALLATION INSTRUCTIONS

Maintenance Notice (cont.)

11

Turn on the gas and water to the water heater by
opening the shut off valves.

9

Replace the front cover panel.

10

Turn on the remote control.

Error Code 88 Clearing

When a tankless water heater has a certain number of
hours of combustion, error code “88” is shown on the
remote control. It is highly recommended to perform
water heater maintenance activities such as flushing the
heat exchanger and/or replacing the water treatment
filter (if applicable). After these maintenance activities are
made, follow the steps below in order to clear error code
“88”.

1

Turn on the remote control.

3

Press the DOWN adjustment button repeatedly until the
lowest setting temperature shows in the LED display.

4

Press and hold the DOWN and UP adjustment button
for 5 to 10 seconds.

2

Turn off the gas and water to the water heater by closing
the shut-off valves.

Start/Adjust

80

5

Turn on the gas and water to the water heater by
opening the shut off valves.
If error code "88" is still shown, repeat steps 1 through 5
above.

Parts Ordering

PARTS REPLACEMENT

WARNING:

For your safety, DO NOT attempt to disassemble, repair, or
replace any portion of this unit. Refer all repairs, service,
and/or adjustments to qualified service personnel.

Address all parts orders to the distributor or store where
the water heater was purchased. All parts orders should
include:

Direct-Vent Gas Components

1. The model and serial number of the water heater from
the rating plate.

2. Specify the gas type (natural or LP) as marked on the
rating plate.

3. Parts description (as shown below) and number of
parts desired.

Ref #

1 Control Board

2 Gas Valve

3 Burner Assembly

4 Blower Motor

5 Burner Manifold

6 Gas Inlet Connector 3/4"

7 Water Control Valve

8 Water Inlet Connector 3/4"

9 Inlet Water Filter

10 Hot Outlet Connector

11 Remote Control Terminal Block

12 Neutralization kit

13 Air Intake Connector

14 Flue Connector

15 Front Cover

Description

Parts

81

PARTS REPLACEMENT

Parts Ordering (cont.)

Outdoor Gas Components

Parts

Ref #

1 Control Board

2 Gas Valve

3 Burner Assembly

4 Blower Motor

5 Burner Manifold

6 Gas Inlet Connector 3/4"

7 Water Control Valve

8 Water Inlet Connector 3/4"

9 Inlet Water Filter

10 Hot Outlet Connector

11 Remote Control Terminal Block

12 Neutralization kit

13 Front Cover

Description

82

LIMITED WARRANTY

For the RHEEM®, RUUD®, Richmond®, Paloma®, and EcoSmart® Residential Tankless Gas Water Heaters.

GENERAL

This Limited Warranty is only available to the original owner of the water heater at the original installation location. This Limited Warranty is not
transferable.

Rheem Sales Company, Inc. (Rheem) warrants this tankless gas water heater, and its component parts, to be free from defects in materials and
manufacture, under normal use and service, for the Applicable Warranty Period specified below. At its option, Rheem will repair or replace the defective
water heater, or defective component part(s), in accordance with the terms of this Limited Warranty, if it fails in normal use and service during the
Applicable Warranty Period. The replacement water heater must be manufactured by Rheem under one of the covered brand names. The replacement
component part(s) must be Rheem authorized component part(s). The replacement unit will be warranted only for the unexpired portion of the original
unit’s Applicable Warranty Period.

Rheem strongly recommends that this tankless water heater be installed by a contractor that is licensed, state qualified and trained on Rheem's tankless
products because improper installation may invalidate warranty coverage.

EFFECTIVE DATE

The Effective Date of warranty coverage (or the beginning of the Applicable Warranty Periods) is the date of the original installation of the water heater, if
properly documented. Otherwise, it is the date of manufacture of the water heater plus ninety (90) days.

APPLICABLE WARRANTY PERIODS: The Applicable Warranty Period depends on the type of installation, as described below:

Residential: a Single Family Dwelling

Twelve (12) years from the Effective Date for the heat exchanger, five (5) years from the Effective Date for the component parts, and one (1) year from the
Effective Date for certain labor as described under the heading, LABOR, SHIPPING AND PROCESSING COST.

Residential: a Single Family Dwelling used with Hydronic Force Air Heating

Ten (10) years from the Effective Date for the heat exchanger, five (5) years from the Effective Date for the component parts, and one (1) year from the
Effective Date for certain labor as described under the heading, LABOR, SHIPPING AND PROCESSING COST. Provided that a Rheem manufactured/
Rheem approved potable water hydronic air handler is installed with the system.

Residential: a Single Family Dwelling with recirculation, controlled loop

Twelve (12) years from the Effective Date for the heat exchanger, five (5) years from the Effective Date for the component parts, and one (1) year from the
Effective Date for certain labor as described under the heading, LABOR, SHIPPING AND PROCESSING COST. Provided that the recirculation system is
an on demand type system or the pump is controlled with a temperature sensor (aquastat) and timer.

Residential: a Single Family Dwelling with recirculation, uncontrolled loop

Three (3) years from the Effective Date for the heat exchanger, three (3) years from the Effective Date for the component parts, and one (1) year from
the Effective Date for certain labor as described under the heading, LABOR, SHIPPING AND PROCESSING COST, if the water heater is installed in a
system in which the water is re-circulated using a continuously operating pump.

Commercial: any installation that is not a single family dwelling

Five (5) years from the Effective Date for the heat exchanger, five (5) years from the Effective Date for the component parts, and one (1) year from the
Effective Date for certain labor as described under the heading, LABOR, SHIPPING AND PROCESSING COST.

Commercial: with recirculation, controlled loop

Five (5) years from the Effective Date for the heat exchanger, five (5) years from the Effective Date for the component parts, and one (1) year from the
Effective Date for certain labor as described under the heading, LABOR, SHIPPING AND PROCESSING COST. Provided that the recirculation system is
an on demand type system or the pump is controlled with a temperature sensor (aquastat) and timer.

Commercial: with recirculation, uncontrolled loop

Three (3) years from the Effective Date for the heat exchanger, three (3) years from the Effective Date for the component parts, and one (1) year from
the Effective Date for certain labor as described under the heading, LABOR, SHIPPING AND PROCESSING COST, if the water heater is installed in a
system in which the water is re-circulated using a continuously operating pump.

WARRANTY EXCLUSIONS

This Limited Warranty will not cover:
a) Damages, malfunctions or failures resulting from:

Chart for Recommended Water Quality Levels

pH (Total Dissolved Solids) TDS Free Carbon Dioxide (CO2) Total Hardness Aluminum Chlorides Copper Iron Manganese Zinc

6.5–8.5 Up to 500 mg/L Up to 15 mg/L Up to 200 mg/L 0.05 to 0.2 mg/L Up to 250 mg/L Up to 1.0 mg/L Up to 0.3 mg/L Up to 0.05 mg/L Up to 5 mg/L

Cited reference: National Secondary Drinking Water Regulations

Warranty

1. Installation of the water heater in environments in which water quality levels DO NOT fall within the ranges listed in the table below:
b) Operating the water heater in a corrosive or contaminated atmosphere, including without limitation damages, malfunctions or failures caused by lime, mineral build-up, or scale.
c) Service trips to your business to teach you how to install, use, or maintain this water heater or to bring the water heater installation into compliance with local building codes and

regulations or manufacturer’s installation requirements.
d) Water heater unit installed for use in: spa or pool heating; a recreational vehicle; a boat or any other watercraft.
e) Water heater unit installed in any circulating system in which the temperature of the incoming water to the water heater is in excess of 140° f.
f) Water heater unit that is installed in any installation supplying radiant heat, such as in floor, baseboard, radiators, snow melt or closed loop systems, or any system using glycol or non-

potable water.
g) Damages, malfunctions or failures resulting from failure to install the water heater in accordance with applicable building codes/ordinances or good plumbing and electrical trade practices.
h) Damages, malfunctions or failures resulting from improper installation or failure to operate and maintain the unit in accordance with the manufacturer’s instructions.
i) Performance problems caused by improper sizing of the water heater or the gas supply line, the venting connection, combustion air openings, electric service voltage, wiring, or fusing.
j) Damages, malfunctions or failures caused by improper conversion from natural gas to LP gas or LP gas to natural gas fuel source.
k) Damages, malfunctions or failures caused by operating the water heater with any parts removed or with modified, altered, or unapproved parts installed.
l) Damages, malfunctions or failures caused by abuse, accident, fire, flood, freeze, lightning, acts of God and the like.
m) Heat exchanger failures (leaks) caused by operating the water heater in a corrosive or contaminated atmosphere or damages, malfunctions or failures caused by lime, mineral build-up, or

scale.
n) Damages, malfunctions or failures caused by operating the unit at water temperatures exceeding the maximum setting of the operating, or high limit, control.
o) Heat exchanger failures caused by operating the water heater when it is not supplied with potable water, free to circulate at all times.
p) Damages, malfunctions or failures caused by subjecting the heat exchanger to pressures, or firing rates, greater than those shown on the rating label.
q) Damages, malfunctions or failures resulting from the use of any attachment, including any energy saving device, not authorized by Rheem.
r) Units installed outside the fifty states (and the District of Columbia) of the United States of America and Canada.
s) Units removed from the original installation location and reinstalled elsewhere.
t) Units that have had their rating labels altered, tampered with, or removed. A water heater should not be operated if the rating label is removed.

83

LABOR, SHIPPING, AND PROCESSING COSTS

For one (1) year after the Effective Date, Rheem will cover reasonable labor costs necessary to repair or replace a tankless water heater or component part that Rheem
determines to be defective and covered by this Limited Warranty. The warranty service must be performed by a contractor that is licensed, state qualified, and trained to
install and service Rheem's tankless water heaters. This Limited Warranty does not cover any labor expenses for general service, inspection, reinstallation, permits, removal
and disposal of the failed water heater or defective component part(s), or updating the installation to meet manufacture or local code requirements. All such expenses are your
responsibility.

Rheem will pay the transportation costs for an “in-warranty” replacement water heater, or “in-warranty” replacement component part(s), to a convenient delivery point (selected
by Rheem) near the place the original water heater, or original component part(s), is located: such as a local water heater distributor. You must pay any local freight charges,
including the cost of returning the failed water heater, or defective component part(s) to a convenient shipping location (selected by Rheem): such as a local Rheem distributor.

Rheem does not authorize, recommend, or receive any benefit from any claims processing or similar fees charged by others to process warranty claims for any water heater
or component part(s). Rheem will not reimburse any party for these, or any other, fees not specifically covered in this Limited Warranty document.

HOW TO OBTAIN WARRANTY CLAIM ASSISTANCE

Any claim for warranty assistance must be made promptly. First, determine if your water heater is “in-warranty” (that is, within the Applicable Warranty Period). You can
determine your unit’s warranty status by adding its Applicable Warranty Period to its date of installation. However, if you DO NOT have documentary proof of your water
heater’s date of installation, your unit’s warranty status will be based on its date of manufacture as determined from the serial number. Add the Applicable Warranty Period
plus ninety (90) days to the date of manufacture to determine whether the water heater is still covered by this Limited Warranty. You may also determine your unit’s warranty
status by obtaining the complete model number, complete serial number, and date of installation of your water heater and then accessing the “Warranty Verification”
information on Rheem Water Heaters' internet website (www.rheem.com) or contacting Rheem's Claims Department (telephone [phone]) during normal business
hours (in the Central Time Zone) to determine if the Applicable Warranty Period has expired.

If your water heater is “in-warranty”, contact the plumber, or mechanical contractor, that installed it for assistance with the warranty repairs, or replacement, required. Rheem
Water Heaters' Technical Service personnel are available to assist you (by telephone at [phone]) in obtaining “in-warranty” service or to answer your questions about
the operation or repair of your water heater during normal business hours (in the Central Time Zone). Be prepared to provide the plumber, mechanical contractor, or Rheem
Technical Service person you call with the complete model number, the complete serial number, and the date of installation of your water heater in addition to an explanation
of your water heater problem.

If an exact replacement is not available, Rheem will provide you with the current model of your water heater, or component part(s), or a replacement unit with comparable
operating features. If government regulations or industry certification or similar standards require the replacement water heater, or replacement component part(s), to have
features not found in the defective water heater, or the defective component part(s), you will be charged for the difference in price represented by those required features. If
you pay the price difference for those required features and/or to upgrade the size and/or other features available on a replacement new water heater, you will also receive a
complete new Limited Warranty (with the full Applicable Warranty Period) for the replacement new water heater.

Rheem reserves the right to inspect, or require the return of, the failed water heater or the defective component part(s). Each “in-warranty” failure water heater must be made
available to Rheem (with the rating label and all the component parts intact) in exchange for the replacement water heater. Each defective “in-warranty” component part to be
replaced must be returned to Rheem in exchange for the replacement component part.

Warranty compensation is subject to validation of “in-warranty” coverage by Rheem Claims Department personnel.

• To obtain warranty compensation for an “in-warranty” water heater failure, you must provide Rheem with the failed water heater (with the rating label and all the component
parts intact) the complete model number and the complete serial number of the Rheem or Ruud water heater that replaced the failed unit; and the date the original water
heater failed. You may also be required to provide documentary proof of the failed water heaters date of installation to establish its “in-warranty” status.

• To receive warranty compensation for an “in-warranty” defective component part, you must provide Rheem with: the defective component part; the complete model
number and the complete serial number of the Rheem or Ruud water heater from which the defective component part was removed; and the date the defective component
part failed. You may also be required to provide documentary proof of the date of installation of the Rheem or Ruud water heater from which the defective part was removed –
or the date of purchase of the part (If it was purchased separately) – to establish the “in-warranty” status of the defective component part.

• If Rheem determines that the water heater or component part returned to Rheem is free of defects in material and manufacture and/or that it was damaged by improper
installation or other cause not covered by this Limited Warranty, the warranty claim for the product, component part and/or labor maybe denied.

Warranty claim documentation should be mailed promptly to Rheem Water Heaters, Claims Department, 800 Interstate Park Drive, Montgomery, Alabama 36109, or in
Canada, 125 Edgeware Rd. Unit 1, Brampton, ON, Canada L6Y 0P5

EXCLUSIVE WARRANTY – LIMITATION OF LIABILITY

THIS LIMITED WARRANTY IS THE SOLE AND EXCLUSIVE WARRANTY PROVIDED IN CONNECTION WITH THIS RHEEM®, RUUD®,
RICHMOND®, PALOMA® AND ECOSMART® RESIDENTIAL TANKLESS GAS WATER HEATER UNIT (THE “WATER HEATER”). No one
is authorized to make any other warranties on behalf of Rheem. ANY IMPLIED WARRANTIES, INCLUDING MERCHANTABILITY, OR FITNESS
FOR A PARTICULAR PURPOSE, SHALL NOT EXTEND BEYOND THE APPLICABLE WARRANTY PERIODS, SPECIFIED PREVIOUSLY.
RHEEM’S SOLE LIABILITY, WITH RESPECT TO ANY DEFECT, SHALL BE AS SET FORTH IN THIS LIMITED WARRANTY, AND ANY
CLAIMS FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES (INCLUDING DAMAGE FROM WATER LEAKAGE) ARE EXCLUDED. Some

states DO NOT allow limitations on how long an implied warranty lasts, or for the exclusion of incidental or consequential damages, so the above
limitations or exclusions may not apply to you.

This Limited Warranty gives you specific legal rights, and you may also have other rights, which vary from state to state.

DO NOT RETURN THIS WATER HEATER OR PART TO RHEEM WITHOUT A RETURN AUTHORIZATION.

This document is for reference only and does not replace the original warranty document found in the back of the Use and Care manual
provided with the tankless water heater.

DO NOT RETURN THIS DOCUMENT TO RHEEM.
KEEP IT WITH YOUR WATER HEATER OR BUSINESS RECORDS.

Name of Owner:

Owner’s Address:

Name of Plumber/
Mechanical Contractor – Installer:

Address of Plumber/
Mechanical Contractor – Installer :

Warranty

Telephone Number of Plumber/
Mechanical Contractor – Installer:

Date of Water Heater Installation:

Model Number of Your Water Heater:

Serial Number of Your Water Heater:

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