Rheem PH-25RDVS, ECO-180DV, RUTG-66DV, RTG-66DV, RMTG-66DV User Manual
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Use & Care Manual
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CERTI FIED
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With Installation Instructions for the Installer
Direct Vent Gas
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,
Paloma
PH-25RDVS (N,P)
Rheem/ Ecosense
RTG-66DV (N,P)
ECO-180DV (N,P)
Ruud RUTG-66DV (N,P)
Richmond
RMTG-66DV (N,P)
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!
California Proposition 65 Warning: This product contains
chemicals known to the State of California to cause cancer, birth
defects or other reproductive harm.
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!
gas supplier’s instructions.
— 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.
● 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.
— 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
— 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.
Printed in Japan
31-92683-000
AP14558 (01/08)
Safety Information
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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
Water 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
Water Temperature .... 26, 27
Care and Cleaning
Maintenance ............. 28
Housekeeping ........ 28, 29
Vent Inspection ...........29
Burner Inspection ........ 29
Extended Shut-Down ......29
#
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.
Draining ................ 30
Freeze Protection ..........30
Troubleshooting Tips
Before You 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
2
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
IMPORTANT SAFETY INFORMATION.
DANGER
FLAMMABLES
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.
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
18" above the floor. This will
reduce, but not eliminate, the
risk of vapors being ignited
by the main burner flame.
Read and follow water heater warnings and instructions. If
owners manual is missing, contact the retailer or manufacturer.
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 coaxial 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 coaxial 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.
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IMPORTANT SAFETY INFORMATION
!
°F
PRIORITY
POWER
ON/OFF
Higher (Hotter) Lower (Cooler)
100 102 104 106 108 110 112 114 116 118 120* 125 130 135 140
°F
38 39 40 41 42 43 44 46 47 48 49* 52 54 57 60 °C
85
29
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
Water Temperature Time To Produce a Serious Burn
120°F (49°C) More than 5 minutes
125°F (52°C) 11/2 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 11/2 seconds
155°F (68°C) About 1 second
Table courtesy of Shriners Burn Institute
Notice:
Display
shows
°F only.
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: The factory setting allows operating temperatures
between 100°F (38°C) and 120°F (49°C). Temperatures
of 85°F (29°C) and above 120°F (49°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
personnel should perform this adjustment. Only factory
authorized remote control(s) should be used.
* Temperatures 85°F(29°C) and above 120°F (49°C)
can be achieved with the Main (UMC-117) remote
control. See page 34 & 35 for minimum and
maximum temperature adjustment.
4
Notice: When this water heater is supplying general
purpose hot water requirements for use by individuals,
a thermostatically controlled mixing valve for reducing
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.
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
1” (2.5 cm) min
1” (2.5 cm)
min
1” (2.5 cm)
min
Coaxial Vent Pipe
& Air Intake
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Installing the water heater :
!
min.
1/2 "
min.
1/2 "
min. 12"
(24" (61 cm) minimum is
recommended for service)
min. 1"
min. 1"
(1.3 cm)
(1.3 cm)
(2.5 cm)(2.5 cm)
(30 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"
Front = 12" (30 cm) Back = 0"*
Side = 1/2" CoAxial Vent = 1"
* (with support bracket)
WARNING: Follow vent
manufacturer’s instruction
while installing vent. If
required, provide
additional clearances from
vent to combustibles per
vent manufacturer’s
instruction.
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, must be installed under
the water heater.
The pan must not restrict combustion
air flow.
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, 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.
● 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 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
1” (2.5 cm) around the coaxial 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:
Manual Appliance
Gas Shut-off Valve
Wood Screw x 5pcs.
Wa sher x 4 pcs.
Use & Care Manual
Tankless Unit
FOR YOUR SAFETY!
—Do not store oruse gasoline or other
flammable vapors orliquids orother
combustible materials in the vicinity of this or
any otherappliance. To do so may result in an
explosion orfire.
—WHAT TO DO IFYOU SMELLGAS
�Do not try to light any appliance.
� Do not touch any electrical switch; do not
use any phone in yourbuilding.
� Immediately call yourgas supplierfrom a
neighbor’s phone. Follow the gas
supplier’s instructions.
� If you cannot reach yourgas supplier, call
the fire department.
� Do not return to yourhome until authorized
by the gas supplierorfire department.
— Improperinstallation, adjustment,
alteration, service ormaintenance can cause
property damage, personal injury, ordeath .
Referto this manual. Installation and service
must be performed by a qualified installer,
service agency orthe gas supplier.
!
WARNING: If the information in these instructions is not followed exactly,
a fire orexplosion may result causing property damage, personal injury ordeath.
!
The purpose of this manual is twofold: one, to provide the installerwith
the basic directions and recommendations forthe properinstallation and
adjustment of the water heater; 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 water heater read 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, refer to 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.
!
!
Use & Care Manual
With Installation Instruc tions for the Installer
Printed in USA
Water Heaters
Residential Gas
Warning: This waterheateris not suitable for
use in manufactured (mobile) homes!
Tankless
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Drain Tubing
NOTICE: The water heater
should not be installed near
an air supply containing
halogenated hydrocarbons.
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.
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).
8
The water heater must be installed with a 3”/5” diameter UL approved Category III Coaxial Stainless Steel
NO!
YES!
Vent Seam
downward slope
7/8" per foot
Ceiling
Vent Pipe
Wall Plates
Board
Inspection
Fire
Stop
Access Panel #1
Inspection
Access
Panel #2
2’
(61 cm)
Max.
94° Elbow
appliance coaxial vent pipe and an appropriate adapter.
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 3”/5”
UL approved Category III
Stainless Steel vent
material only. No other
vent material is permitted.
WARNING: Refer to
page 7 for clearances to
combustible material.
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 coaxial vent components (adapters, pipe,
elbows, terminals, etc.) should be UL 1738
Certified 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
coaxial vent pipe with the anti-disconnection
joint.
Follow coaxial vent manufacturer’s
installation instructions and their
recommended clearances to combustibles.
The unit can be vented either horizontally
or vertically.
Coaxial 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 below).
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.
Number
of 90°
elbows
(bends)
1 26’
2 24' 6"’
3 23"
4 21' 6"
Maximum
Length of
Straight
Pipe
(8.0 m)
(7.5 m)
(7.0 m)
(6.5 m)
Venting Lengths
MAXIMUM VENT LENGTH: The
system will not operate if there is excessive
restriction (pressure drop) in the venting
system. A maximum 26’
may be used provided there is only one 90°
elbow in the system. If additional elbows are
required: two elbows can be used with 24’
6"
(7.5 m)
, three elbows can be used with
(7.0 m)
or four elbows can be used with 21
6"
(6.5 m) of vent pipe.
A 90° 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 as
straight pipe when determining total vent
lengths.
The 94° elbow is equivalent to a 90° elbow.
The vent should be installed with a slight
downward slope of 7/8” per foot of
horizontal run toward the vent terminal (see
diagram below). This ensures that any
(8.0 m)
of vent pipe
23’
’
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.
MINIMUM VENT LENGTH: The venting
may be as short as 12” (30 cm), provided
one vent termination is installed to the
outdoors through a sidewall, one 94° elbow
is included in the installation and the wall
plates are installed.
Notice: Make sure that the seam of the inner
vent pipe in horizontal runs is toward the
top of the installation (see diagram to the far
left).
9
Installing the water heater:
downward slope
7/8" per foot
Ceiling
Vent Pipe
Wall Plates
Board
Inspection
Fire
Stop
Access Panel #1
Inspection
Access
Panel #2
2’
(61 cm)
Max.
94° Elbow
Appliance
Vent Adapter
Water Heater
Exhaust
Flow
B
Collar
A
Venting Through Closed Spaces
If the coaxial vent piping passes through a closed space, a minimum
clearance of 1” (2.5 cm) when installed horizontally or 6”
installed vertically should be maintained between the coaxial vent pipe
and combustibles and noncombustibles. Be sure to follow local codes
and vent manufacturer’s installation instructions.
For maintenance and inspection purposes, the following access panels
are required.
● Two (2) inspection access panels large enough to allow access for
venting inspection. One (1) of these access panels should be close
to where the coaxial vent pipe enters the ceiling. The other access
panel should be near the vent termination.
● A ventilation access panel with a 16 in2 (103 cm2) opening should
be provided every 10 ft (3 m).
(15 cm)
when
CAUTION: Ensure that
the appliance vent adapter is
securely attached to the water
heater collar.
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 drain
back into any part of the
vent system.
WARNING: Failure to
provide a vent condensate
drain close to the appliance
could allow acidic flue gas
condensate to enter into
appliance flueways, causing
10
premature failure of the
appliance.
Appliance Vent Adapter
The water heater must be installed
with a UL 1738 approved Category III
Stainless Steel appliance coaxial vent
adapter.
Read the following instructions before
installation.
● Test fit the adapter over the water heater
collar before proceeding.
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, a condensate trap
must be installed as close as practical to the
water heater in order to prevent condensate
from draining back into the water heater.
See Examples A and B on page 13 and 14
for DOWNWARD and UPWARD slope for
horizontally vented water heaters.
● Slide adapter end “A” down over heater
collar “B” as far as it will go.
● Use the screws provided with the vent
adapter to attach the adaptor to the heater
collar.
NOTICE: Follow the appliance coaxial vent
adapter manufacturer’s instructions.
When a water heater is vented vertically,
an UPWARD slope must always be used.
A condensate trap must be installed in the
horizontal section of the vent and as close
as practical to the water heater in order to
prevent condensate from draining back into
the water heater. 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.
D
V
V
E
FIXED
CLOSED
O
P
ERA
BL
E
O
PE
R
A
BL
E
FIXE
D
CLOSED
v
v
B
L
F
C
B
v
v
v
X
B
B
B
A
J
B
I
H
X
v
M
K
v
G
A
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
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.
12 inches (30 cm) above anticipated
snow level.
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) above anticipated
snow level.
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).
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
3 feet (91 cm) within a height 15 feet
(4.57 m) above the meter/regulator
I = Clearance to service regulator
coaxial vent outlet.
J = Clearance to nonmechanical air
supply inlet to the combustion
air inlet to any building or other
appliance.
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
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."
* *
* *
* *
*
assembly.
3 feet (91 cm) *
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)
(30kW).
6 feet (1.83 m)
7 feet (2.13 m)† *
for appliances > 50,000 Btuh (15kW).
3 feet (91 cm) above if within 10 feet
(3 m) horizontally.
Not Allowed Not Allowed
11
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