Rheem Water Heater Residential Indoor Gas Tankless Water Heater User Guide

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.  
 
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
 
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
 
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
 
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
 
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
 
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
 
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
 
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.  
O
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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  
 
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  
 
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).  
12  
 
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.  
13  
 
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.  
14  
 

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