Paloma PH2-20 User Manual

!

Use & Care Manual

R

Direct Vent Gas

With Installation Instructions for the Installer

Tankless Water Heater

!

Warning: This water heater is not suitable

for use in manufactured (mobile) homes!

The purpose of this manual is twofold: one, to provide the installer with
the basic directions and recommendations for the proper installation
and adjustment of the water heater; and two, to the owner–operator,
to explain the features, operation, safety precautions, maintenance and
troubleshooting of the water heater. This manual also includes a parts
list.

It is very important that all persons who are expected to install, operate
or adjust this water heater read the instructions carefully so they may
understand how to perform these operations. If you don’t understand
these instructions or any terms within it, seek professional advice.

Any questions regarding the operation, maintenance, service or warranty
of this water heater should be directed to the seller from whom it was
purchased. If additional information is required, refer to the section on
If You Need Service.

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

Recognize this symbol as an indication of Important Safety
Information!

WARNING: If the information in these instructions is not followed exactly,

!

a fire or explosion may result, causing property damage, personal injury or death.

FOR YOUR SAFETY!

!

— Do not store or use gasoline or other

flammable vapors or liquids or other
combustible materials in the vicinity of
this or any other appliance. To do so may
result in an explosion or fire.

— 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.

Models
PH2-20R DVSN (Natural Gas); PH2-20R DVSP (L.P. Gas)
PH2-25R DVSN (Natural Gas); PH2-25R DVSP (L.P. Gas)
PH2-28R DVSN (Natural Gas); PH2-28R DVSP (L.P. Gas)

California Proposition 65 Warning: This product contains
chemicals known to the State of California to cause cancer, birth

!

defects or other reproductive harm.

 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.

— Improper installation, adjustment,

alteration, service or maintenance can cause
property damage, personal injury or death.
Refer to this manual. Installation and service
must be performed by a qualified installer,
service agency or the gas supplier.

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31-93681-00

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AP15419 (11/09)

Safety Information

Safety Precautions . . . . . . . 3–6

LP Gas Models . . . . . . . . . . . 5

FOR YOUR RECORDS

Write the model and serial numbers here:

#

Installation Instructions

Location . . . . . . . . . . . . . . . . . .7

Inspect Shipment . . . . . . . . . . .8

Venting . . . . . . . . . . . . . . . 9-14

W ater Connections . . . . 15, 16

Relief Valve . . . . . . . . . . . . . .17

Gas Supply . . . . . . . . . . . . . . 18

High Altitude . . . . . . . . . . . . .18

Remote Control . . . . . . . 19, 20

Electrical Connection . . . . . .21

Typical Installation . . . . . . . .22

Pipe Insulation . . . . . . . . . . . .23

Installation Checklist . . . . . . .24

Operating Instructions

Lighting Instructions . . . . . . 25

W ater Temperature . . . . 26, 27

Care and Cleaning

Maintenance . . . . . . . . . . . . . 28

Housekeeping . . . . . . . . 28, 29

Vent Inspection . . . . . . . . . . .29

Burner Inspection . . . . . . . . 29

Extended Shut-Down . . . . . .29

Draining . . . . . . . . . . . . . . . . 30

Freeze Protection . . . . . . . . . .30

T r oubleshooting T ips

Before Y ou Call

For Service . . . . . . . . . . . 31, 32

Customer Service

Parts List . . . . . . . . . . . . . . . . 33

If You Need Service . . . . . . .36

Qualified Installers Only!

Maximum Temperature

Adjustment . . . . . . . . . . . . . . 34

Minumum Temperature

Adjustment . . . . . . . . . . . . . . 35

High Altitude Adjustment . . .35

#

You can find them on a label on the appliance.

Staple sales slip or cancelled check here.

Proof of the original purchase date is needed to obtain service
under the warranty.

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 Guide. If you review the chart of
Troubleshooting Tips first, you may not need to call for service.

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

!

that will result in death or serious
injury.

!

WARNING

could result in death or serious injury

and/or damage to property.

!

CAUTION

may result in minor or moderate

injury.

Notice:

specified procedure or maintain
a specific condition.

An imminently hazardous situation

A potentially hazardous situation that

A potentially hazardous situation that

Attention is called to observe a

2

IMPORTANT SAFETY INFORMATION.
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 serious bodily injury or death. 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.

DANGER!

INSTALL AND PROPERLY VENT THE WATER HEATER…

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 can result in unsafe operation
of the water heater. To avoid the risk of fire, explosion or asphyxiation from carbon
monoxide, never operate this water heater unless it is properly vented and has an adequate
air supply for proper operation.

Be sure to inspect the vent terminal, the air intake, and the concentric 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 concentric
vent system inspection.

WARNING!

Gasoline, as well as other flammable materials and liquids (which include, but are not
limited to adhesives, solvents, paint thinners etc.), and the vapors they produce are
extremely dangerous. DO NOT handle, use or store gasoline or other flammable or
combustible materials anywhere near or 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 property damage, bodily injury or
death.

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 he ater has a main
burner flame.
The main burner flame:

1. which c an come on
at any time and

2. will ignite flammable
vapo rs.

Vapo rs:

1. cannot be seen,

2. are heavier than air,

3. go a long way on the
floo r 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.

3

!

IMPORTANT SAFETY INFORMATION
READ ALL INSTRUCTIONS BEFORE USING.

DANGER!

WATER TEMPERATURE SETTING

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 severe burns or death from scalding. Be sure to read and follow
the warnings outlined on the label pictured below.

Time/Temperature Relationship in Scalds

!

DANGER

HOT

BURN

Water temperature over 125°

can

cause severe burns

instantly or

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.

death from scalds.

F

Water Temperature Time To Produce a Serious Burn

120°F (49°C) More than 5 minutes

125°F (52°C) 1
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
155°F (68°C) About 1 second

Table courtesy of Shriners Burn Institute

1

/2 to 2 minutes

1

/2 seconds

The chart shown above may be used as a guide in
determining the proper water temperature for your home.

!

DANGER: Households with small children, disabled
or elderly persons may require a 120°F (49°C) or lower

temperature setting to prevent contact with “HOT” water.

Maximum water temperature occurs while burner is on.
To find water temperature being delivered, turn on a hot
water faucet and place a thermometer in the water stream
and read the thermometer. (See page 26 & 27 for more
details.)

The temperature of the water at the outlet of the water
heater can be regulated by setting the temperature on
Remote Control. The remote control was set at 100°F
(38°C) before it was shipped from the factory.

The diagram to the bottom left illustrates the Remote
Control and how to adjust the water temperature.

Notice:
Display

shows
°F only.

PRIORITY

°F

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 qualified service

POWER

ON/OFF

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

Notice: When this water heater is supplying general
purpose hot water requirements for use by individuals,
a thermostatically controlled mixing valve for reducing

Higher (Hotter) Lower (Cooler)

125 130 140

52 54 60

°F

°C

85

100 102 104 106 108 110 112 114 116 118 120*

38 39 40 41 42 43 44 46 47 48 49*

29

* Temperatures 85°F(29°C) and up to 140°F (60°C) can be

achieved with the Main (UMC-117) remote control. See page
34 & 35 for minimum and maximum temperature adjustment.

point of use water temperature is recommended to reduce
the risk of scald injury. Contact a licensed plumber or the
local plumbing authority for further information.

4

DANGER!

NATURAL GAS AND LIQUEFIED PETROLEUM MODELS

Both LP and natural gas 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 LP or natural gas, 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 utilizing LP gas are different

from natural gas models. A natural gas
water heater will not function safely on LP
gas and vice versa.

 No attempt should ever be made to

convert the water heater from natural gas
to LP gas. To avoid possible equipment
damage, personal injury or fire, do not
connect the water heater to a fuel type not
in accordance with the unit data plate;
propane for propane units and natural gas
for natural gas units. These units are not
certified for any other fuel type.

 LP appliances should not be installed below

grade (for example, in a basement) if such
installation is prohibited by federal, state
and/or local laws, rules, regulations or
customs.

Notice: If a gas leak is present or suspected:

 Do not attempt to find the cause yourself.
 Do not try to light any appliance.
 Do not touch any electrical switch.
 Do not use any phone in your building.
 Leave the building immediately and make

sure your family and pets leave also.

 Leave the doors open for ventilation and

contact the gas supplier, a qualified service
agency or the fire department.

 Stay away from the building until the

service call has been made, the leak is
corrected and a qualified agency has
determined the area to be safe.

 Propane or LP gas 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 sniff near the floor also.

 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.

 It is recommended that more than one

method, such as soapy solution, gas
detectors, etc., be used to detect leaks
in gas applications.

5

IMPORTANT SAFETY INFORMATION
READ ALL INSTRUCTIONS BEFORE USING.

!

WARNING!

For your safety, the information in this manual must be followed to minimize the risk
of fire or explosion, electric shock, or to prevent property damage, personal injury or
loss of life.

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 PRECAUTIONS

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.

 Read this manual entirely before installing

or operating the water heater.

 Use this appliance only for its intended

purpose as described in this Use and Care
Manual.

 Be sure your appliance 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 technician.

READ AND FOLLOW THIS SAFETY INFORMATION CAREFULLY.

SAVE THESE INSTRUCTIONS

6

Installing the water heater :

!

0” (Zero)

(0 cm)

1/2” (min)

(1.3 cm)

1/2” (min)

(1.3 cm)

12” (min)

(30 cm)

(24” (61cm) minimum is
recommended for service)

0” (Zero)

(0 cm)

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. A copy 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 Park, Quincy, MA 02269 as NFPA 54. In Canada, the latest edition of the CSA
B149.1 Natural Gas and Propane Installation, and the Canadian Electrical Code, CSA C22.1 Part 1, in the
absence of local codes.

Location of Water Heater

WARNING:
Combustible construction
refers to adjacent walls
and ceilings and should not
be confused with
combustible or flammable
products and materials.
Combustible and/or
flammable products and
materials should never be
stored in the vicinity of this
or any gas appliance.

Minimum Clearance from

Combustible and

Non-Combustible

Construction.

Top = 12" (30 cm) Bottom = 12" (30 cm)
Front = 12" (30 cm) Back = 0"*
Side = 1/2" (1.3 cm) Concentric Vent = 0"
* (with support bracket)

The water heater should not be located in
an area where leakage of the heat exchanger
or connections will result in damage to the
area adjacent to it or to lower floors of the
structure.

When such areas cannot be avoided, it is
recommended that a suitable catch pan,
adequately drained to a safe location be
installed under the water heater.

A gas fired water heater or any other appliance
should not be installed in a space where liquids
which give off flammable vapors are
to be used or stored. Such liquids include
gasoline, LP gas (butane or propane), paint
or adhesives and their thinners, solvents
or removers.

Because of natural air movement in a room or
other enclosed space, flammable vapors can be
carried some distance from where their liquids
are being used or stored. The open flame of
the water heater’s main burner can ignite these
vapors causing an explosion or fire which
may result in severe burns, death or property
damage.

The water heater must be located so it is not
subject to physical damage, for example, by
moving vehicles, area flooding, freezing, etc.

If the water heater is installed in a garage, it
should be installed so that the direct ignition
system and main burner are no less than 18
inches (45 cm) above the garage floor.

Raising the gas fired water heater will reduce
BUT NOT eliminate the possibility of lighting
the vapor of any flammable liquids which may

be improperly stored or accidentally spilled.

 The water heater should be installed as

close as practical to the vent termination
to minimize vent length and the number of
elbows required for venting.

 The water heater should be installed with

the proper venting materials and termination
suitable for Category III venting or Rheem
approved venting.

 A fire stop plate should be installed at every

penetration of a floor or ceiling if the vent is
not running in a fire rated shaft.

 Failure to install and properly vent the water

heater to the outdoors as outlined
in the Venting Section of this manual
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.

 Do not install the water heater in

bathrooms, bedrooms, any occupied rooms
normally kept closed, or in outdoor areas.

 Do not install water heater where subject

to vibrations.

 Do not install the water heater in

Recreational Vehicles, Mobile Homes,
Boats and other Watercrafts.

 Do not install the water heater near vents

for heating or cooling. A minimum of 4 feet
(1.2 m) should be maintained.

 Minimum water heater clearance from

combustible and non-combustible
construction is 1/2” (1.3 cm) sides, 0” rear
(with support bracket); 12” (30 cm) from
the bottom; 12” (30 cm) from the front of
the water heater; and 12” (30 cm) from
the top (24” [61 cm] from front and top is
recommended for servicing purposes).

 Maintain a minimum clearance of

0” (0 cm) around the concentric

vent

pipe to combustible or non-combustible
construction, unless otherwise specified
by vent manufacturer or installed in an
enclosed space. If the clearances stated on
the Instruction/Warning Label, located on
the front panel of the heater differ, install
the water heater according
to the clearances stated on the label.

7

Installing the water heater:

NOTICE: The water heater
should not be installed near
an air supply containing
halogenated hydrocarbons
and/or other corrosives.

Corrosive Atmospheres

The air in beauty shops, dry cleaning
establishments, photo processing labs,
and storage areas for liquid and powdered
bleaches or swimming pool chemicals
often contains such halogenated
hydrocarbons and/or corrosives.

An air supply containing halogenated
hydrocarbons may be safe to breathe,
but when it passes 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.

The water heater warranty is voided when
failure of the heater is due to operation in
a corrosive atmosphere.

Inspect Shipment

Inspect the water heater for possible damage. Check the markings on the rating plate of
the water heater to be certain the type of gas supplied corresponds to the water heater
requirements. Verify all included parts are present (see below).

Drain Tubing

PRIORITY

°F

POWER

ON/OFF

Remote Control

Assembly Kit

Remote Control Cable

Wood Screw x 5pcs.

Washer x 4 pcs.

Manual Appliance

Gas Shut-off Valve

Use & Care Manual

With Installation Instructions for the Installer

Residential Gas

Tankless

Water Heaters

Warning: This waterheateris not suitable for

use in manufactured (mobile) homes!

The purpose of this manual is twofold: one, to provide the installerwith
the basic directions and recommendations forthe properinstallation and
adjustment of the waterheater; and two, to the owner–operator, to
explain the features, operation, safety precautions, maintenance and
troubleshooting of the waterheater. This manual also includes a parts
list.
It is imperative that all persons who are expected to install, operate or
adjust this waterheaterread the instructions carefully so they may
understand how to perform these operations. If you don’t understand
these instructions orany terms within it, seek professional advice.
Any questions regarding the operation, maintenance, service or
warranty of this waterheatershould be directed to the sellerfrom whom
it was purchased. If additional information is required, referto the
section on How to Obtain Service Assistance.
Do not destroy this manual. Please read carefully and keep in a safe
place forfuture reference.

Recognize this symbol as an indication of Important Safety

!

Information!

California Proposition 65 Warning:This product contains

!

chemicals known to the State of California to cause cancer, birth
defects orotherreproductive harm.

WARNING: If the information in these instructions is not followed exactly,

!

a fire orexplosion may result causing property damage, personal injury ordeath.

!

FOR YOUR SAFETY!

l If you cannot reach yourgas supplier, call

—Do not store or use gasoline or other

the fire department.
flammable vapors or liquids or other
combustible materials in the vicinity of this or

l Do not return to yourhome until authorized

any otherappliance. To do so may result in an

by the gas supplierorfire department.
explosion orfire.

— Improperinstallation, adjustment,

alteration, service ormaintenance can cause

—WHATTO DO IFYOU SMELL GAS

property damage, personal injury, ordeath .

lDo not try to light any appliance.

Referto this manual. Installation and service

l Do not touch any electrical switch; do not

must be performed by a qualified installer,

use any phone in yourbuilding.

service agency orthe gas supplier.

l Immediately call yourgas supplierfrom a

neighbor’s phone. Follow the gas
supplier’s instructions.

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Printed in USA

Tankless Unit

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Use & Care Manual

8

The water heater must be installed with a 3”/5” diameter UL approved Category III Concentric Stainless
Steel appliance concentric vent pipe or Rheem approved concentric vent pipe.

DANGER: Failure to
install the appliance vent
adapter and properly vent the
water heater to the outdoors
as outlined in the Venting
section of this manual will
result in unsafe operation of
the water heater, causing death,
serious injury, explosion,
or fire. 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 the
Venting section of this manual.

WARNING: Use only 3”/5”
UL approved Category III
Concentric Stainless Steel vent
material or Rheem approved
concentric vent material. No
other vent material is
permitted.

WARNING: Follow
concentric vent
manufacturer’s installation
instructions and their
recommended clearances to
combustibles.

Venting

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

The water heater must be vented to the
outdoors as described in these instructions.
DO NOT connect this water heater to a
chimney. It must be vented separately from
all other appliances.

All concentric vent components (adapters,
pipe, elbows, terminals, etc.) should be
Rheem approved Stainless Steel Venting
Material
(e.g. AL29-4C).

The specified vent termination must be used.
(Refer to pages 13 and 14 for an example of
the concentric vent.)

Use the screws provided to connect
the concentric vent pipe with the anti­disconnection joint.

The unit can be vented either horizontally
or vertically.

Concentric vent pipe runs must be
adequately supported along both horizontal
and vertical runs.

The maximum recommended unsupported
span should be no more than five (5) feet
(1.5 m). Support isolation hanging bands
should be used. DO NOT use wire. (See
diagram)

Notes on pre-existing vent:

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 detailed in this Use and Care
Manual have been met. Carefully inspect the
entire venting and air intake system for any
signs of cracks or fractures, particularly at
the joints 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.

See the back page of this manual
for additional requirements for the
Commonwealth of Massachusetts.

NO!

YES!

Number of

90° elbows

(bends)

1 39’

2 37' 6"

3 36"

4 34' 6"

5 33'

6 31'6"

Maximum

Length of

Straight Pipe

(12.0 m)

(11.5 m)

(11.0 m)

(10.5 m)

(10.0 m)

(9.5 m)

Venting Lengths

MAXIMUM VENT LENGTH:

The system will not operate if there is
excessive restriction (pressure drop) in the
venting system. A maximum 39’

(12.0 m)
vent pipe may be used provided there is only
one 90° elbow in the system. If additional
elbows are required: two elbows can be used
with 37’ 6"
with
with 34

(11.5 m)

36’ (11.0 m)

’ 6 "

(10.5 m) of vent pipe. (See table)

, three elbows can be used

or four elbows can be used

A 94° elbow is equivalent to 1’6” (.5 m) of
straight pipe. A 45° elbow is equivalent to
9” (.25 m) of straight pipe.

The vent termination does not count
in equivalent to pipe calculation when
determining total vent lengths.

The vent should be installed with a slight
downward slope of 1/4” per foot of
horizontal run toward the vent terminal (see
diagram). This ensures that any condensate
formed during operation of the unit is
evacuated from the appliance and to prevent
rain from entering the appliance.

An upward slope toward the vent terminal is
not acceptable for horizontal venting without

of

installing the drain tube to the condensation
trap. For horizontal installation with less
than 10’ (3.1m), a 94° elbow is required.

MINIMUM VENT LENGTH: The venting
may be as short as 12” (30cm), in addition
to installation of one 94° elbow and one
vent termination to the outdoors through a
side wall (Total equivalent vent length: 30”
(76cm)).

Notice: Make sure that the seam of the inner
vent pipe in horizontal runs is toward the top
of the installation (see diagram).

Vent Seam

9

Installing the water heater:

Venting Through Closed Spaces

94° Elbow

12” (min)

(30 cm)

Fire
Stop

1/4" per foot

downward slope

Inspection

Access Panel #1

(optional)

Wall Plates

Follow local codes and vent manufacturer’s installation instructions.
For maintenance and inspection purposes

panels large enough to allow access for venting inspection

. One (1) of these access panels should be close to where the

required

Vent Pipe

concentric vent pipe enters the ceiling. The other access panel should
be near the vent termination.

Ceiling

Board

Inspection

Access

Panel #2
(optional)

Appliance Vent Adapter

Metal Fab Inc., standard concentric vent pipe
can be installed into the water heater collar
without an appliance vent adapter. However,
other Rheem approved vent manufacturer pipe
cannot be installed without a UL approved
Category III Stainless Steel appliance
concentric vent adapter.

two (2) inspection access

may be

Notice: To install the appliance vent adapter,
please follow the appliance vent adapter
manufacturer’s instructions.

CAUTION: Condensate
is known to be acidic; refer
to local, state (provincial)
or federal codes for proper
handling and discharge
methods.

CAUTION: Condensate

must drain away from the
water heater and should
not be allowed to enter the
water heater.

WARNING: Failure to
provide a vent condensate
drain close to the appliance
could allow acidic flue gas
condensate to enter into
appliance flueways, causing
premature failure of the
water heater.

WARNING: If the

condensate collector is not
used, the drain fitting must
be capped to prevent
exhaust gases and
condensate from entering
the building. The cap is
supplied on the water
heater.

Draining the Condensate

Provision should be made to collect and
dispose of condensate from venting systems.

When a water heater is vented horizontally,
the vent pipe can have a DOWNWARD or
UPWARD slope towards the termination. If an
UPWARD slope is used, always attach a drain
hose to the drain fitting and plumb the hose to
a sanitary sewer drain.

See Examples A and B on pages 13 and 14
for DOWNWARD and UPWARD slope for
horizontally vented water heaters.

When a water heater is vented vertically, an
UPWARD slope must always be used. See the
diagram on page 14 showing UPWARD slope
for vertically vented water heaters.

Always attach a drain hose to the drain fitting
and plumb the hose to a sanitary sewer drain.

A high temperature silicone tubing suitable for
use with acidic condensate and appropriate for
the temperature range should be used.

The drain tube is fashioned into a “pigtail” trap
and must be filled with water to prevent flue
gases from emitting into the building prior to
operating the appliance. (see diagram)

Must be fi lled with water to prevent
gasses from backing into building

Condensate Drain Line

(to suitable drain)

10

G

v

A

D

E

V

B

V

L

C

ED

IX

F

v

OSED

L

C

R

E

P

O

v

F

B

B

v

B

E

ABL

B

FIXE

S

LE

CLO

B

RA

E

P

O

v

J

B

A

H

X

D

v

ED

X

I

v

K

M

VENT TERMINAL

V

AIR SUPPLY INLET

X

AREA WHERE TERMINAL IS NOT PERMITTED

Horizontal Vent Terminal Location

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

Canadian Installations

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 corner.

H = Clearance to each side of center line

extended meter/regulator assembly.

above

I = Clearance to service regulator

concentric vent outlet.

J = Clearance to nonmechanical air

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

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.

1 In accordance with current 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.
* For clearances not specified in ANSI 223.1/NFPA 54 or CSA-B149.12, one of the following shall be indicated:
a) A minmum clearance value determined by testing in accordance with section 2.20, or;
b) A reference to the following footnote: "Clearance in accordance with local installtion codes and the require­ ments of the gas supplier."

12 inches (30 cm) above anticipated

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).

snow level.

* *

* *

* *

* *

* *

3 feet (91 cm) within a height 15 feet

(4.57 m) above the meter/regulator

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

assembly.

3 feet (91 cm) *

(30kW).

6 feet (1.83 m)

7 feet (2.13 m)† *

Not Allowed Not Allowed

1

US Installations

12 inches (30 cm) above anticipated

10,000 Btuh (3 kW), 9 inches (23 cm)

for appliances > 10,000 Btuh (3kW)

and < 50,000 Btuh (15kW), 12 inches

(30 cm) for appliances > 50,000 Btuh

snow level.

6 inches (15 cm) for appliances <

(15kW).

*

6 inches (15 cm) for appliances < 10,000

Btuh (3 kW), 9 inches (23 cm) for

appliances > 10,000 Btuh (3kW) and <

50,000 Btuh (15kW), 12 inches (30 cm)

for appliances > 50,000 Btuh (15kW).

3 feet (91 cm) above if within 10 feet

(3 m)

horizontally.

2

11

Installing the water heater:

Additional Considerations

Indoor Water Heater

Caulk

Rising moisture will
collect under eaves.

If soffit vent is too close,
block off and install new
vent at another location.

Inside

Caulk

Corner

6’ (1.8 m)

Caulk Zone

(1.2 m)

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

WARNING

: For multiple unit installation, a minimum
distance between vent terminations must be maintained to
prevent recirculation of vent gases. Maintain a center-to-center
distance between vent terminations of 19 inches (48 cm) for two
unit installation. Maintain a center-to-center distance between
vent terminations of 21 inches (53 cm) for three or more unit
installation.

6’

(1.8 m)

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

1 ft. sq. (30 x 30 cm) sheet metal plate on

4’

brick or masonry surface, recommended.

Caulk

RTV silicone caulk

Do NOT install vent terminal under any patio or deck.

To help prevent moisture from freezing on walls and under

eaves, do not locate vent terminal on the side of a build ing with
prevailing winter winds.

To help prevent water lines from freezing, do not locate vent

terminal on the side of a building with prevailing winter winds.

Do NOT terminate vent directly on brick or masonary surfaces. A

rust resistant sheet metal backing plate (1x1 foot) (30x30 cm) is
recommended behind vent. See figure on left.

Do Not locate vent terminal too close to shrubbery, as flue gases

may damage them.

Caulk all cracks, seams and joints within six (6) feet (1.8 m) of vent

terminal.
Caulk around wall face plate for weather tight seal.
All painted surfaces should be primed to lessen the chance of

physical damage. Painted surfaces will require maintenance.
Do NOT extend exposed vent pipe of indoor water heaters outside

of building.

Guard vent against accidental contact with people and pets.

12