Use & Care Manual
With Installation Instructions for the Installer
136,000 BTU Max Input
Residential Indoor 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 owneroperator, to explain the
features, operation, safety precautions,maintenance and
troubleshooting of the water heater. 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 or
any terms within it, seek professional advice.
Output Temp
F
Set Temp
Error Code
Any questions regarding the operation, maintenance,
DOWN
UP
ON/OFF
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 SafetyInformation!
California Proposition 65 Warning: This product contains chemicals known to the State of
California to cause cancer, birthdefects or other reproductive harm.
WARNING: If the in formation 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.
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.
WHAT TO DO IF YOU SMELL GAS
-
Improper installation, adjustment,
-
Do not try to light any appliance.
Do not touch any electrical switch; do not
use any phone in your building.
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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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 properly install the water heater outdoors as outlined in 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 installed properly and has an adequate air supply for proper
operation. Be sure to inspect the flue terminal 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 flue terminal inspection.
WARNING!
Gasoline, as well as other flammable materials and liquids (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
any where 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.
3
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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 . Water temperatures above 125oF 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
120oF
125oF
130oF
135oF
140oF
More than 5 minutes
11/2to 2 minutes
About 30 seconds
About 10 seconds
Less than 5 seconds
145oF
Less than 3 seconds
About 1 1/ 2seconds
About 1 second
150oF
155oF
Table courtesy of Shriners Burn Institute
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 120oF.
Or lower temperature setting to prevent contact
with HOT water.
Water temperature over 125°F can
cause severe burns instantly or
death from scalds.
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.
Children, disabled and elderly are
at highest risk of being scalded.
See instruction manual before
setting temperature at water
heater.
The temperature of the water at the outlet of the
water heater can be regulated by setting the
temperature on control panel . The control panel was
set at 110oF before it was shipped from the factory.
Feel water before bathing or
showering.
Temperature limiting valves are
available, see manual.
The illustration to the bottom left illustrates the
control panel and how to adjust the water
temperature.
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.
Output Temp
F
Set Temp
Error Code
Notice: The factory setting allows operating
temperatures between 90oF and 140oF.
DOWN
UP
ON/OFF
4
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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
Notice: If a gas leak is present or suspected:
safely on LP gas and vice versa.
Do not attempt to find the cause yourself.
No attempt should ever be made to
Do not try to light any appliance.
convert the water heater from natural
Do not touch any electrical switch.
gas to LP gas. To avoid possible
Do not use any phone in your building.
equipment damage, personal injury or
Leave the house immediately and make
f ire, do not connect the water heater to a
sure your family and pets leave also.
fuel type not in accordance with the unit
Leave the doors open for ventilation and
data plate; propane for propane units
contact the gas supplier, a qualified
and natural gas for natural gas units.
service agency or the fire department.
These units are not certified for any
Stay away from the house (or building)
other fuel type.
until the service call has been made, the
leak is corrected and a qualified agency
LP appliances should not be installed
below grade (for example, in a basement)
has determined the area to be safe.
if such installation is prohibited by
federal, state and/or local laws, rules,
regulations or customs.
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
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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 residential water heaters must be braced, anchored or
strapped to resist falling or horizontal displacement due to earthquake motions. For
residential water heaters up to 52 gallon capacity, a brochure with generic earthquake
bracing instructions can be obtained from: Office of the State Architect, 400 P Street,
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.
Part of your water heater unless it is
specifically recommended in this
manual. All other servicing should be
referred to a qualified technician.
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.
READ AND FOLLOW THIS SAFETY INFORMATION
CAREFULLY.
SAVE THESE INSTRUCTIONS
6
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Installing the water heater.
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
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 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.
The water heater should be installed
with the proper venting materials and
termination suitable for Category III
venting.
When such areas cannot be avoided it is
recommended that a suitable catch pan,
adequately drained, must be installed
under the water heater.
Failure to install and properly venting
the water heater to the outdoors as
outlined in the Venting Section of this
manual can result in unsafe operation.
The pan must not restrict combustion
air flow.
Long hot water lines should be insulated
to conserve water and energy.
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.
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.
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.
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.
Do not install the water heater in small,
poorly ventilated rooms, or in air tight
rooms with air-conditioning.
Do not install water heater where
subject to vibrations.
The water heater must be located so it is
not subject to physical damage, for example,
by moving vehicles, area flooding, etc.
Do not install the water heater in
Recreational Vehicles, Mobile Homes,
Boats and other Watercrafts.
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 above the garage floor.
Do not install the water heater near
vents for heating or cooling. A
minimum of 4 feet should be
maintained.
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.
Minimum clearance from combustible
construction is 1/2 sides, 0 rear (with
support bracket); 12 from the bottom;
12 from the front of the water heater;
and 12 from the top (24 from front
and top is recommended for servicing
purposes). 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
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Installing the water heater.
Proper operation of the water heater requires air for combustion and ventilation. Provisions for
combustion and ventilation air must comply with referenced codes and standards.
Combustion and Ventilation Air
If air is supplied from outdoors, directly or
through vertical ducts, there must be two
openings located as specified above and
each must have a minimum net free area
of not less than one square inch per 4000
Btuh of the total input rating of all the
appliances in the enclosure.
NOTICE: If the water heater is installed in
an unconfined space within a building of
conventional frame, masonry or metal
construction, infiltration air is normally
adequate for proper combustion and
ventilation. If the water heater is installed in
a confined space, provisions for combustion
and ventilation air must be made.
If horizontal ducts are used to
A confined space is one having a volume
of less than 50 cubic feet per 1000 Btuh of
the aggregate input of all appliances
within that space.
communicate with the outdoors, each
opening must have a minimum net free
area of not less than one square inch per
2000 Btuh of the total input rating of all
the appliances in the enclosure. If ducts
are used, the minimum dimensions of
rectangular air ducts shall not be less than
The air must be supplied through two
permanent openings of equal area. One
is to be located within 12 above the floor
and the other is to be located within 12
below the ceiling.
3
.
NOTICE: If the duct openings which supply
combustion and ventilation air are to be
covered with a protective screen or grill, the
net free area (openings in the material) of
the covering material must be used in
determining the size of the openings.
Protective screening for the openings MUST
NOT be smaller than 1/4 esh to prevent
clogging by lint or other debris.
The minimum net free area of each opening
must not be less than one square inch per
1000 Btuh of the total input rating of all
the appliances in the enclosure (but not
less than 100 square inches), if each
opening communicates with other
unconfined areas inside the building.
Buildings of unusually tight construction
shall have the combustion and ventilation
air supplied from outdoors, or a freely
ventilated attic or crawl space.
Corrosive Atmospheres
NOTICE: The water heater
The air in beauty shops, dry cleaning
establishments, photo processing labs,
and storage areas for liquid and powdered equipment are highly corrosive after
Propellants from common spray cans
or gas leaks from A/C and refrigeration
should not be installed near
an air supply containing
halogenated hydrocarbons.
bleaches or swimming pool chemicals
often contain such halogenated
hydrocarbons.
passing through a flame.
The water heater warranty is voided
when failure of the heater is due to
operation in a corrosive atmosphere.
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.
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).
Wood Serew x 4pcs
Washer x 4pcs
Exposive screw 2pcs
Use & Care Manual
8
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Mounting the Water Heater
The brackets can be adjusted to change
the distance between the back of the
appliance and the wall within the range of
3/8 to 1 1/2
Make sure the location of the appliance
allows for easy access and operation.
CAUTION:
Reinforcement of the wall is
required in case the wall is
not strong enough to hold
the appliance.
Wall studs should be utilized when
mounting the water heater to the wall.
In case of dry wall or concrete wall use
dry wall anchors or lag bolts.
Loosen the adjustment screws of both the
top and the bottom brackets to adjust the
distance. (See diagram below)
The water heater requires 120VAC/60Hz.
Have a receptacle with ground terminal
near the water heater. The length of the
power supply cord is 10 feet.
Install a wood screw for the upper bracket
with a clearance of 1/8 between the wall
and the screw head. Hang the center of the
upper bracket on the screw.
Using a wood screw and a washer, affix
the lower bracket to the wall (Left and
Right). Repeat to affix the top bracket.
Water Supply Connections
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.
Plumbing should be carried out by a
qualified plumber in accordance with local
codes.
To supply hot water to upper floors,
additional water pressure (0.44 psi/ft)
must be ensured. The measurement
should be calculated by the distance
between the water inlet of the water
heater (ground level) to the hot water
faucet (upper floor level).
Use approved plumbing materials only.
All material between the water supply and
the water heater must be metal.
Well water systems should be set at
a range of 50-60 psi.
The diameter of the pipe lines should be a
minimum of 3/4
.
When the water is supplied from a
water supply tank, the height of the
tank and the diameter of the pipes and
their relation to water pressure, should
be taken into consideration. Gravity
water pressure is not recommended.
To conserve energy and to prevent
freezing, insulate both cold and hot water
supply lines. DO NOT cover the drain
valves.
CAUTION: This water
heater must only be used
with the following water
supply system conditions:
To ensure proper operation of the water
heater, the following water pressure
guidelines should be followed:
Notice: If the water flow resistance of
a shower head is too high, the burner
in the water heater will fail to ignite.
Keep the shower head clean from
debris that could cause additional
pressure drop.
With clean, potable water
free of corrosive
chemicals, sand, dirt, or
other contaminates.
Operation of the water heater requires
the minimum water pressure of 14 psi
and a minimum water flow rate of
0.66 gpm.
With inlet water
temperatures above 32oF,
but not exceeding 120oF.
Notice: If using mixing valves on the
outlet, choose one which prevents cold
water pressure from overcoming hot
water line pressure.
Additional water pressure is required
for long pipe runs and outlet fitting(s)
water pressure drops.
Free of lime and scale
deposits.
DO NOT reverse the hot
and cold water
connections. The water
heater will not operate.
To maintain proper performance, ensure
sufficient water supply pressure. The
Required Water Pressure = Min.
Operating Water Pressure (14 psi) +
Pipe Pressure Loss + Faucet and
Shower Pressure Loss + Safety Margin
(more than 5 psi).
9
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Installing the water heater.
Water Supply Connections Continued.
Install a shutoff valve near the inlet of the
water heater for service and draining
purposes.
Install a Check Valve between the water
heater and the water shutoff valve. (See
illustration the top left).
DO NOT use pipes with smaller diameters The following should be addressed in
than the water supply connection of the
water heater.
regards to the HOT WATER OUTLET:
Connections between the water heater
and point(s) of use should be as short
and direct as possible.
Before connecting the water supply pipe
to the water heater, open the shutoff valve
and clean out sand, debris, air, caulking
material, etc. inside the pipe. Connect to
the water inlet, then check water flow.
DO NOT use lead or plastic pipe.
To conserve energy and minimize heat
loss, insulation of hot water piping is
recommended.
Close the shutoff valve and clean the
water filter.
Be sure to connect the water inlet and the
hot water outlet as shown on the water
heater. If reversed, the water heater will
not function.
Notice: The flow rate of hot water may
vary when more than two faucets
(appliances, fixtures, etc.) are being used
simultaneously.
Installation of unions or flexible copper
connections are recommended on the
HOT and COLD water lines, so that the
water heater may disconnect easily for
servicing if necessary.
Notice: 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 (see diagram to the left).
The discharge line must be NO
Relief Valve
SMALLER than the outlet of the valve
and must pitch downward to allow
complete drainage (by gravity) of the
relief valve and discharge line.
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,
must be installed at the hot water outlet
connection of the water heater at the
time of installation. Local codes shall
govern the installation of relief valves.
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.
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DOWN
UP
ON/OFF
For safe operation of the water heater, be
sure that:
Notice: Local codes govern the
installation of relief valves. If local codes
require that a temperature and pressure
relief valve should be installed the
manufacturer recommends a type 40XL
Watts T&P relief valve or an equivalent
model be used.
The pressure rating of the relief valve
must not exceed 150 psi, the maximum
working pressure of the water heater as
Hot Water
Supply
Outlet
Cold Water
marked on the rating plate.
Pressure
Relief
Valve
Supply Line
Shut-off
Valve
Discharge
line
(To Suitable Drain)
The BTUH rating of the relief valve
must equal or exceed the BTUH input
of the water heater as marked on its
rating plate.
6
Air Gap
Notice: Manual operation of relief valves
should be performed at least once a year.
Turn off the electrical power and gas
shutoff valve. Lift and release lever on the
relief valve and check the manual
No valve of any type should be
installed between the relief valve and
the water heater
Notice: The above illustrates a
pressure only relief valve. If local
codes require a combination
temperature and pressure relief
valve be installed, an extension
piece may be needed.
Discharge from the relief valve should
be piped to a suitable drain to eliminate
potential water damage. Piping used
should be of a type approved for the
distribution of hot water.
operation of the relief valve. You should
take precaution to avoid contact with the
hot water coming out of the relief valve
and to prevent water damage.
Hot and cold water lines should be
insulated up to the water heater. Refer
Notice: If the relief valve on the system
discharges periodically, a problem exists
and service to the water system is
required.
10
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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. Such conversion could result in hazardous operating conditions.
Gas Supply
The supplied Manual Gas Appliance
Shutoff Valve must be installed at the gas
connection of the water heater at the time
of installation (see diagram to the left).
Compound used on the threaded joints of
the gas piping must be of the type resistant
to the action of LP gas. Use compound
sparingly on male threads only.
The branch gas supply line to the water
heater should be clean 3/4 black steel
pipe or other approved gas piping
material.
A sediment trap should be installed at the
bottom of the gas line.
Do not use excessive force (over 31.5 ft
lbs.) in tightening the pipe, particularly if
teflon pipe compound is used, as the unit
may be damaged.
A ground joint union or ANSI design
certified semi-rigid or flexible gas
appliance connector should be installed in
the gas line close to the water heater. The
National Fuel Gas Code (NFGC)
The inlet gas pressure to the water heater
must not exceed 10.5 w.c. for natural or
14 wc for LP gas. For purposes of input
adjustment, the minimum inlet gas
mandates a manual gas shut-off valve: See
(NFGC) for complete instructions.
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.
If flexible connectors are used, the
maximum length shall not exceed 36
.
If lever type gas shut offs are used, they
shall be T-Handle type.
Leak Testing
Use a soapy water solution to test for
leaks at all connections and fittings.
Bubbles indicate a gas leak that must
be corrected.
WARNING: Never use
an open flame to test for
gas leaks, as property
damage, personal injury, or
death could result.
The water heater and its gas connections
must be leak tested at normal operating
pressures before it is placed in operation.
The factory connections should also
be leak tested after the water heater
is placed in operation.
Turn on the gas shut-off valve(s) to
the water heater.
WARNING: Install a
gas pressure regulator, in
the gas supply line, which
does not exceed the
Pressure Testing the Gas Supply System
The water heater and its manual gas shutoff
valve must be disconnected from the
gas supply piping system during any
pressure testing of the system at
The water heater must be isolated from
the gas piping system by closing the
manual gas shut-off valve during any
pressure testing of the gas supply
piping at pressures equal to or less than
1/2 psi (14 w.c.) .
maximum supply pressure.
pressures in excess of 1/2 psi (14 w.c.).
DO NOT use an industrial
type gas regulator.
High Altitude
NOTICE: For installations above 3,280
feet, the connector on the PC board
must be replaced for High Altitude
installations. Please contact your local
distributor, dealer, or Rheem for
replacement connector.
Ratings of gas appliances are based on
sea level operation and need not be
changed for installations at elevations up
to 3,000 feet.
11
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Installing the water heater.
The water heater must be installed with a RTG20002B vent adapter or a UL approved Category III
Stainless Steel equivalent.
Venting
The installation of venting must comply
with national codes, local codes, and the
vent manufacturer's instructions
Follow vent manufacturer's installation
instructions.
The unit can be vented either horizontally
or vertically.
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.
Support isolation hanging bands should be
used. DO NOT use wire. (See diagram
below).
DANGER: Failure to
install the 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.
The water heater must be vented to the
outdoors as described in these instructions.
DO NOT connect this water heater to an
existing Vent or Chimney, it must be
vented separately from all other
appliances.
All vent components (adapters, pipe,
elbows, terminals, etc.) should be UL1738
Certified Stainless Steel Venting Material
(e.g. AL29-4C).
The specified vent termination must be
used. The termination should be a 90°
elbow type with screen. (Refer to page 15)
WARNING: Use UL
approved Category III
Stainless Steel vent material
only. No other vent
Use a vent pipe with an anti-disconnection
structure.
material is permitted.
The use of a High Temperature Silicone
(500oF) may be required to seal vent
connections. To prevent accidental gas
exhaust leakage, apply a 1/4 wide bead
approximately 1/4 from the end and
another bead against the joint side of the
stop bead.
WARNING: Refer to
page 7 for clearances to
combustible material.
Venting Lengths
The vent can be installed with a slight
downward slope of 1/4 per foot of
horizontal run toward the vent terminal
(see diagram below). This ensures that
any condensate formed during operation
of the unit is evacuated from the
appliance.
MAXIMUM VENT LENGTH - The
system will not operate if there is
excessive restriction (pressure drop) in the
venting system. A maximum of 47 feet 6
inches of vent pipe may be used provided
there is only one 90o elbow in the system.
If additional elbows are required: two
elbows can be used with 42 feet 6 inches,
and three elbows can be used with 37 feet
6 inches of vent pipe.
A 1/4 per foot upward slope is acceptable
when it is not possible to vent with a
downward slope, however, a UL approved
Category III Stainless Steel condensate
trap MUST be installed at the beginning
of the horizontal run (See page 15
Typical Horizontal Termination
w/ 1/4 per foot UPWARD Slope or
page 16, Standard Vertical Vent
Termination for examples).
A 90o elbow is equivalent to 5 feet to
straight pipe. A 45o elbow is equivalent to
2 feet 6 inches of straight pipe.
The termination elbow does not count as
an elbow when determining total vent
lengths.
MINIMUM VENT LENGTH - The
venting may be as short as 12 , provided
one vent termination is installed to the
outdoors through a sidewall, one 90o
elbow is included in the installation, and
the wall thimble is installed.
Notice: Make sure that the seam of the
vent pipe in horizontal runs is toward the
top of the installation (see illustration to
the far left).
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Venting Through Closed Spaces
If the vent piping passes through a closed space, wrap the vent
pipe with inflammable insulation material that is at least 3/4
thick. DO NOT let the insulation material make contact with
flammable materials. A minimum clearance of 3 between the
vent pipe and ceiling should be maintained. Be sure to follow
local codes.
For maintenance and inspection purposes, the following holes
are required to be made.
Two (2) inspection openings that allow access to venting.
One (1) of these openings should be close to where the
vent pipe enters the ceiling. The other opening should be
near the vent termination.
A ventilation hole with a 16 sq. in. opening should be
made at least every 10 feet.
NOTICE: Vent pipes must be completely insulated with
inflammable material when installed in alcoves, closets, and
garages and must not touch any flammable material.
Vent Adapter
A UL approved vent adapter is required
for vent connection.
Tighten the clamp around the collar.
Read the following instructions before
installation.
Inspect the inside of the adapter to
verify that the collar and adapter are
sealed. If more sealant is required,
apply sealant to a flat tool, then spread
around the collar edge on inside of
adapter.
Test fit the adapter over the water
heater collar before proceeding. Adjust
clamp as needed.
With an alcohol wipe, clean inside
surface "A" of adapter and outside
surface of "B" of heater collar.
Ensure that the clamp does not interfere
with the damper shaft.
NOTICE: Follow the vent adapter
manufacturer's instructions
Apply 1/4" wide bead of high
temperature silicone (500oF) around
outside of heater collar "B".
Slide adapter end "A" down over heater
collar "B" as far as it will go.
Draining the Condensate
Condensate is known to be acidic; refer to
local, state (provincial) or federal codes
for proper handling methods.
In certain conditions, installations in
unconditioned space or having long
horizontal or vertical runs may accumulate
condensate.
In order to prevent condensate from
draining back into the water heater, we
recommend a condensate trap and drain to
be installed in a horizontal vent section as
close as practical to the water heater vent
connection.
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Installing the water heater.
Horizontal Vent Terminal Location
The location of the vent terminal depends on the following
minimum clearances and considerations (see illustration):
Twelve (12) inches above grade level and above normal
snow levels.
Four (4) feet below, or four (4) feet horizontally from any
door, window, soffit, under eave vent or gravity air inlet to
the building or other appliances, or from gas or electric
meters. Do not locate vent above walkways, doors,
windows, air inlets, gas or electric meters or other
equipment.
Ten (10) feet from any forced air inlet to the building.
Any fresh or make-up air inlet such as for a dryer or
furnace area is considered to be a forced air inlet.
Eighteen (18) inches from an inside corner formed by two
exterior walls.
Additional Considerations
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 building
with prevailing winter winds.
Do Not terminate vent pipe directly on brick or masonry
surfaces. Use a rust-resistant sheet metal backing plate
(2 x 2 feet) behind vent. (See illustration.)
Do Not locate vent terminal too close to shrubbery, as flue
gasses may damage them.
Caulk all cracks, seams and joints within six (6) feet of vent
terminal.
All painted surfaces should be primed to lessen the chance of
physical damage. Painted surfaces will require maintenance.
Insulate vent pipe exposed to cold conditions (attics, crawl
spaces, etc.) with inflammable material to help prevent
moisture from accumulating in vent pipe.
Do Not extend exposed vent pipe outside of building.
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