Rheem RTGH-95XLP-2 User manual

95% CONDENSING
TANKLESS
WATER HEATER
AP18161-1 (11/16)
Do not destroy manual. Please read
carefully and keep in a safe place
for future reference.
CERTIFIED
R
WARNING:
This water heater is not suitable
for use in manufactured (mobile)
homes.
WARNING:
If the information in these
instructions is not followed
exactly, a fire or explosion may
result, causing death, personal
injury, or property damage.
For Your Safety!
• Do not store or use gasoline
or other flammable vapors and
liquids in the vicinity of this or
any other appliance. To do so
may result in an explosion or
fire.
• Installation and service must
be performed by a qualified
installer, service agency, or the
gas supplier.
What to Do If
You Smell Gas
• Do not try to light any
appliance.
• Do not touch any electrical
switch; do not use any
phone in your building.
• Immediately call your gas
supplier from a neighbor’s
phone. Follow the gas supplier’s
instructions.
• If you cannot reach your
gas supplier, call the fire
department.
• Do not return to your home until
authorized by the gas supplier
or fire department.
D
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®
USE AND CARE MANUAL
With Installation Instructions
for the Installer
Condensing Direct Vent and Outdoor
199,900 Btu/hr, 180,000 Btu/hr and
157,000 Btu/hr Models

Important Safety Information
Safety Precautions ��������������������������������������������������������������������� 2–8
Product Information
Product Information ������������������������������������������������������������������������ 8
Specifications ��������������������������������������������������������������������������� 9, 10
General Descriptions��������������������������������������������������������������� 11, 12
Using Your Water Heater
Setting the Water Temperature������������������������������������������������� 13, 14
Caring for Your Water Heater
Water Heater Inspections������������������������������������������������������� 15, 16
Care and Cleaning ������������������������������������������������������������������ 17, 18
Preventive Maintenance ��������������������������������������������������������������� 19
Draining the Water Heater��������������������������������������������������������20–22
Freeze Protection ������������������������������������������������������������������������� 22
Vacation and Extended Shutdown ����������������������������������������������� 23
Troubleshooting Chart ������������������������������������������������������������ 23, 24
Service Error Code Chart������������������������������������������������������� 25, 26
If You Need Service
Call for Assistance������������������������������������������������������������������������ 26
Safety
Installation Instructions
Standards Compliance ������������������������������������������������������������������ 28
Choosing a Location�����������������������������������������������������������������28, 29
Product Inspection������������������������������������������������������������������������� 30
Water Heater Installation��������������������������������������������������������� 30–33
Venting������������������������������������������������������������������������������������� 34–46
Water Quality/Supply���������������������������������������������������������������� 47-51
Condensate ����������������������������������������������������������������������������������� 51
Gas Supply�������������������������������������������������������������������������������52-57
Electrical Wiring������������������������������������������������������������������������57-61
Remote Control Installation�������������������������������������������������������60-61
Insulation Blankets ������������������������������������������������������������������������ 62
Installation Checklist���������������������������������������������������������������������� 63
Piping for Space Heaters �������������������������������������������������������������� 64
Recirculation Control ���������������������������������������������������������������� 65-67
Activating the Water Heater������������������������������������������������������ 68-69
Setting the Water Temperature��������������������������������������������������70-72
High-Altitude Dip Switch Adjustments�������������������������������������� 72-73
Water Saving Control Option���������������������������������������������������� 74-75
Maintenance Notice Option������������������������������������������������������ 76-77
Parts Replacement������������������������������������������������������������������� 78-79
Warranty Information�����������������������������������������������������������������83-84
2
CONTENTS
READ THE SAFETY INFORMATION
Your safety and the safety of others are very important.
There are many important safety messages in this manual
and on your appliance. Always read and obey all safety
messages.
This is the safety alert symbol. Recognize this
symbol as an indication of Important Safety
Information! This symbol alerts you to potential
hazards that can kill or hurt you and others.
All safety messages will follow the safety alert symbol
and either the word “DANGER,” “WARNING,” “CAUTION,”
or “NOTICE.”
These words mean:
IMPORTANT SAFETY INFORMATION
WARNINGS:
• This water heater is not approved for use in
manufactured (mobile) homes!
• Improper installation, adjustment, alteration, service,
or maintenance can cause death, personal injury, or
property damage. Follow the instructions in this manual.
READ ALL INSTRUCTIONS
BEFORE USING.
Be sure to read and understand the entire Use and Care Manual
before attempting to install or operate this water heater. It
may save you time and money. Pay particular attention to the
Safety Instructions. Failure to follow these warnings could result
in death or serious bodily injury. Should you have problems
understanding the instructions in this manual, or have any
questions, STOP and get help from a qualified service technician
or the local gas utility.
WARNING:
California Proposition 65
This product contains chemicals known to the state of California
to cause cancer, birth defects, or other reproductive harm.
DANGER: An imminently hazardous situation that
will result in death or serious injury.
NOTICE: Attention is called to observe a specified
procedure or maintain a specific condition.
CAUTION: A potentially hazardous situation that
may result in minor or moderate injury.
WARNING: A potentially hazardous situation
that can result in death or serious injury and/or damage to
property.

Safety
3
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.
Water Heater Venting Safety
DANGER:
• Failure to install and properly vent the water heater to
the outdoors as outlined in the “Venting” section of the
Installation Instructions in this manual will result in
death from fire, explosion, or asphyxiation from carbon
monoxide. NEVER operate this water heater unless it is
properly vented and has the air supply piping properly
installed and terminated to the outdoors.
• Be sure to inspect the vent terminal, the air intake,
and the vent system on the water heater for proper
installation at initial start-up and at least annually
thereafter. Refer to the “Care and Cleaning” section
of this manual for more information regarding vent
system inspection.
WARNINGS:
• Gasoline and other flammable liquids, materials,
and vapors (including paint thinners, solvents,
and adhesives) are extremely dangerous. DO NOT
handle, use, or store gasoline or other flammable or
combustible materials anywhere in the vicinity of a
water heater or any other appliance. Be sure to read
and follow the labels on the water heater, as well as the
warnings printed in this manual. Failure to do so can
result in death, bodily injury, or property damage.
• Combustible construction refers to adjacent walls and
ceilings and should not be confused with combustible
or flammable products and materials. Combustible
materials, such as clothing, cleaning materials, or
flammable liquids, should never be stored in the vicinity
of this or any gas appliance. Fire or explosion can occur
causing death, personal injury, and/or property damage.
See page 29 for clearances to combustible materials.
• Follow vent manufacturer’s instructions for venting
installation, including additional clearances from
combustibles, to avoid conditions that can lead to
death, personal injury, and/or property damage.
• Use tankless water heater manufacturer-approved
Schedule 40 PVC (foam core is not permitted at any
time), Schedule 80 PVC, CPVC, ABS, UL 1738-listed
Category III Stainless Steel, or InnoFlue® PP. No other
vent material is permitted. For Canada, installations
must follow ULC S636 for exhaust venting.
• Moisture in the flue gas will condense as it leaves the
vent terminal. In cold weather this condensate can
freeze on the exterior wall, under the eaves, and on
surrounding objects. Some discoloration to the exterior
of the building is to be expected. However, improper
location or installation may result in severe damage to
the structure or exterior finish of the building.
• For multiple-unit installation, a minimum distance
between vent terminations must be maintained to
prevent recirculation of vent gases. See page 39 for
information on venting and clearances to multiple
terminations.
CAUTIONS:
• Ensure that the appliance vent is securely glued and
attached to the vent connection on the top of the water
heater. DO NOT USE SCREWS.
• DO NOT operate without the condensate drain connected
and routed to a proper drain.

4
IMPORTANT SAFETY INFORMATION
Water Supply Safety
DANGER
!
HOT
Water temperature over 125°F (52°C)
can cause severe burns instantly or
death from scalds.
Children,disabled and elderly are
at highest risk of being scalded.
See instruction manual before
setting temperature at water
heater.
Feel water before bathing or
showering.
Temperature limiting valves are
available, see manual.
BURN
Temperature Conversion Chart °F/°C
85 100 102 104 106 108 110 112 114 116 118 120 125 130 140 °F
29 38 39 40 41 42 43 44 46 47 48 49 52 54 60 °C
Time/Temperature Relationship in Scalds
120°F (49°C) More than 5 minutes
125°F (52°C) 1 1/2 to 2 minutes
130°F (54°C) About 30 seconds
135°F (57°C) About 10 seconds
140°F (60°C) Less than 5 seconds
145°F (63°C) Less than 3 seconds
150°F (66°C) About 1 1/2 seconds
155°F (68°C) About 1 second
Table courtesy of Shriners Burn Institute
Water Temperature Time to Produce
a Serious Burn
Safety
!
DANGERS:
• WATER TEMPERATURE SETTINGS
– Safety and energy conservation
are factors to be considered when
selecting the water temperature
setting of a water heater’s remote
control. Water temperatures above
125°F (52°C) can cause death
or severe burns from scalding.
Be sure to read and follow the
warnings outlined on the pictured
label.
• There is a hot water scald potential
if the water temperature is set
too high. Households with small
children, the disabled, or elderly
persons may require a 120°F
(49°C) or lower temperature setting
to prevent contact with “HOT”
water.
• Before manually operating the
relief valve, make certain no one
will be exposed to the danger
of the hot water released by
the valve. The water may be hot
enough to create a scald hazard.
The water should be released into
a suitable drain to prevent injury or
property damage.
• Failure to perform the recommended Routine Preventive
Maintenance can harm the proper operation of this
water heater, which can cause carbon monoxide
dangers, excessive hot water temperatures, and other
potentially hazardous conditions.
!
WARNINGS:
• IMPORTANT: DO NOT apply heat to the HOT or COLD
water connections. If sweat connections are used,
sweat tubing to adapter before fitting adapter to the
water connections on heater. Any heat applied to the
water supply fittings will permanently damage the
internal components of the water heater.
• In case the pipe insulation is not rated for the
appropriate weather conditions, install electric heat
tracing or equivalent to prevent freezing of the pipes.
DO NOT insulate or block the drain valve on the hot
outlet fitting. If the pipes are allowed to freeze, the
water heater and the pipes may malfunction or leak due
to freezing water.
• Failure to drain the water heater as described on page
20 can cause serious personal injuries from scalding
and/or damage the water heater.
CAUTIONS:
•This water heater must only be used
with the following water supply system
conditions:
– With clean, potable water free of corrosive
chemicals, sand, dirt, or other contaminants.
– With inlet water temperatures above 32°F
(0°C), but not exceeding 120°F (49°C).
– DO NOT reverse the hot and cold water
connections. The water heater will not operate.
•Even when drained properly, a small
amount of water will remain in the water
heater. In cold weather conditions, this
water can freeze. If this happens, allow
the defrost protection on the heater
at least 30 minutes to melt the frozen
water or the water heater may not work
properly.
NOTICE:
The factory setting allows operating
temperatures between 100°F (38°C) and 120°F
(49°C). Temperatures of 85°F (29°C) and up to
140°F (60°C) can be achieved with the MAIN
(UMC-117) remote control. Temperatures of
85°F (29°C) can be achieved with the Bath
(USC-117 or USC2-117) remote control. Only
qualified service personnel should perform this
adjustment. Only factory-authorized remote control(s) should be
used.

5
IMPORTANT SAFETY INFORMATION
WARNINGS:
• The installation of gas piping must comply with local
utility company requirements and/or in the absence of
local codes, use the latest edition of National Fuel Gas
Code (NFGC), ANSI Z223.1/NFPA 54, or CAN/CSA B149.1,
Natural Gas and Propane Installation Code.
• If inlet gas pressure is out of allowable range [4.0” w.c.
(1.0kPa) – 10.5” w.c. (2.6kPa)] for Natural Gas, or [8.0”
w.c. (2.0kPa) – 13.0” w.c. (3.2kPa)] for LP gas, a gas
pressure regulator must be installed to maintain the
allowable inlet gas pressure.
• Should overheating occur or the gas supply fail to shut
off, turn off the manual gas control valve to the water
heater.
CAUTIONS:
• DO NOT attempt repair of electrical wiring, gas piping,
remote control, burners, vent connectors, or other safety
devices. Refer repairs to qualified service personnel.
• Turn off the manual gas shut-off valve if the water
heater has been subjected to overheating, fire, flood,
physical damage, or if the gas supply fails to shut off.
• DO NOT turn on the water heater unless the water and
gas supplies are completely opened.
Natural Gas and Liquefied Petroleum Safety
DANGERS:
• Never attempt to convert the water heater from natural
gas to LP or vice versa. The water heater must only use
the fuel type in accordance with listing on data plate—
natural gas for natural gas units and LP for LP units.
Any other fuel usage will result in death or serious
personal injury from fire and/or explosion. This water
heater is not certified for any other fuel type.
• Both natural gas and propane (LP) have an odorant
added to aid in detecting a gas leak. Some people
may not physically be able to smell or recognize this
odorant. If you are unsure or unfamiliar with the
smell of natural gas or LP, ask the gas supplier. Other
conditions, such as “odorant fade,” which causes
the odorant to diminish in intensity, can also hide or
camouflage a gas leak.
• Water heaters using LP gas are different from natural
gas models. A natural gas water heater will not
function safely on LP and vice versa.
• LP must be used with great caution. It is heavier than
air and will collect first in lower areas, making it hard
to detect at nose level.
• Before attempting to light the water heater, make sure
to look and smell for gas leaks. Use a soapy solution
to check all gas fittings and connections. Bubbling at
a connection indicates a leak that must be corrected.
When smelling to detect a gas leak, be sure to also sniff
near the floor.
• Gas detectors are recommended in LP and natural
gas applications and their installation should be
in accordance with the detector manufacturer’s
recommendations and/or local laws, rules, regulations,
or customs.
• Combustible materials, such as clothing, solvents,
cleaning materials, or flammable liquids, must not be
placed in the vicinity of the water heater.
• If a gas leak is present or suspected:
– DO NOT attempt to find the cause yourself.
– Never use an open flame to test for gas leaks. The gas can
ignite resulting in death, personal injury, or property damage.
– Follow the steps listed under “What to Do If You Smell Gas”
found on the front cover of this manual.
Safety

6
IMPORTANT SAFETY INFORMATION
Before operating this water heater, be sure to read and
follow the instructions on the label pictured below and all
other labels on the water heater, as well as the warnings
printed in this manual.
Failure to do so can result in unsafe operation of the water
heater, resulting in death, personal injury, or property
damage. Should you have any problems reading or
following the instructions in this manual, STOP and get
help from a qualified service technician.
WARNING : If you do not follow these instructions exactly, a fire or explosion may result
causing property damage, personal injury or loss of life.
FOR YOUR SAFETY READ BEFORE OPERATING
1.STOP! Read the safety information above on this label.
2.Turn off all electric power to the appliance.
3.Do not attempt to light the burner by hand.
4.Turn the Gas Shutoff Valve located on the outside of the unit
clockwise to the "OFF" position.
5.Wait five (5) minutes to clear out any gas. If you then smell gas, STOP! Follow "B" in
the safety information above on this label. If you don't smell gas, go to the next step.
6.Turn the Gas Shutoff Valve located on the outside of the unit counterclockwise to
the "ON" position.
7.Turn on all electric power to the appliance.
8.If the appliance will not operate, follow the instructions "To Turn Off Gas To Appliance"
and call your service technician or gas supplier.
TO TURN OFF GAS TO APPLIANCE
1 . Turn off all electric power to the appliance if service is to be performed.
2 . Turn the Gas Shutoff Valve located on the outside of the unit clockwise to the "OFF" position.
GAS SHUTOFF
VALVE
OPEN CLOSE
OPERATING INSTRUCTIONS
Safety

7
IMPORTANT SAFETY INFORMATION
Electrical Safety
DANGER:
• Shock Hazard – Make sure the electrical power to the
water heater is off to avoid electric shock that will
result in death or serious personal injury.
WARNINGS:
• For your safety, the information in this manual must
be followed to minimize the risk of fire, explosion, or
electric shock that can result in death, personal injury,
and/or property damage.
• Field wiring connections and electrical grounding must
comply with local codes or, in the absence of local
codes, with the latest edition of the National Electrical
Code, ANSI/NFPA 70, or in Canada, Canadian Electrical
Code, CAN/CSA C22.1, Part 1.
CAUTIONS:
• Label all wires prior to disconnecting for service. Wiring
errors can cause dangerous and improper operation.
Verify correct operation after servicing.
• For your safety, burner inspection and cleaning should
be performed only by qualified service personnel.
• Make certain the power to the water heater is OFF
before removing the unit cover panel. Exposed
electrical components and moving parts can cause
personal injuries.
• For your safety, DO NOT attempt repair of electrical
wiring, gas piping, remote control, burners, vent
connectors, or other safety devices. Refer repairs to
qualified service personnel.
Safety
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.
FOR INSTALLATIONS IN THE STATE OF CALIFORNIA

8
IMPORTANT SAFETY INFORMATION
General Installation and Maintenance Safety
WARNINGS:
• This water heater must be installed in accordance
with these instructions, local codes, utility company
requirements and/or in the absence of local codes,
use the latest edition of the American National
Standard/National Fuel Gas Code (NFGC), ANSI Z223.1
and National Fire Protection Association, NFPA 54, or
in Canada, CAN/CSA B149.1, Natural Gas and Propane
Installation Code, and the latest edition of the
National Electrical Code, ANSI/NFPA 70, or in Canada,
Canadian Electrical Code, CAN/CSA C22.1, Part 1.
• For your safety, DO NOT attempt to disassemble this
water heater for any reason. Improper adjustments,
alterations, service, or maintenance can cause death,
personal injury, or property damage.
SAVE THESE INSTRUCTIONS
SAFETY PRECAUTIONS:
Read this manual entirely before installing and/or operating
the water heater.
Use this water heater only for its intended purpose as
described in this Use and Care Manual.
Have the installer show you the location of the gas shut-
off valve and how to shut it off if necessary. Turn off
the manual shut-off valve if the water heater has been
subjected to overheating, fire, flood, physical damage, or if
the gas supply fails to shut off.
Be sure your water heater is properly installed in
accordance with local codes and the provided installation
instructions.
DO NOT attempt to repair or replace any part of your water
heater unless it is specifically recommended in this manual.
All other servicing should be referred to a qualified service
technician.
PRODUCT INFORMATION
For Your Records
Write down and save the following product information
along with the original sales slip and/or cancelled check.
The model and serial numbers can be found on the top
label on the right side of the water heater.
MODEL NUMBER:
SERIAL NUMBER:
DATE OF INSTALLATION:
INSTALLING COMPANY/PHONE NUMBER:
PLUMBING CONTRACTOR/PHONE NUMBER:
See page 26 for additional service information.
Read This Manual
Inside you will find many helpful hints on how to use and
maintain your water heater properly. A little preventive care on
your part can save you time and money over the life of your
water heater.
You’ll find many answers to common problems in the
Troubleshooting Chart on pages 23 and 24. Always refer to
this chart before calling for service. Referring to this chart
before calling may answer your question(s) and eliminate the
need for service.
Preoperating Checklist
Is the main gas valve to the water heater turned on?
Is the fuse in place or is the breaker turned on?
Does the water heater’s electronic ignition light?
Is the water temperature set to a safe temperature?
Is the water heater connected to a floor drain?
Is the water heater properly vented to the outside?
Is the water heater installed in a safe location away
from flammable materials and/or freezing conditions?
Product Information Safety

9
PRODUCT INFORMATION
Product Information
303/8"
(772 mm)
275/8"
(702 mm)
33/8"
(86 mm)
51/2"
(140 mm)
61/4"
(159 mm)
177/8"
(454 mm)
185/8"
(473 mm)
93/4"
(248 mm)
21/4"
(59 mm)
51/2"
(140 mm)
61/8"
(156 mm)
21/8"
(54 mm)
37/8"
(98 mm)
27/8"
(73 mm)
41/8"
(105 mm)
91/2"
(241 mm)
11/2"
(38 mm)
Specifications – Direct-Vent Models
17 7/8"
(454 mm)
18 5/8"
(473 mm)
27 5/8"
(702 mm)
93/4"
(248 mm)
21/4"
(59 mm)
51/2"
(140 mm)
61/8"
(156 mm)
21/8"
(54 mm)
37/8"
(98 mm)
27/8"
(73 mm)
41/8"
(105 mm)
91/2"
(241 mm)
11/2"
(38 mm)
Specifications – Outdoor Models

10
PRODUCT INFORMATION
Specifications
Product Information
The following product informa-
tion can be found from the rating
label on this water heater.
A. Model Number
B. Serial Number
C. Data Bar Code
D. Heater Type
E. Installation Type
F. Type of Gas
G. Max. Inlet Gas Pressure
H. Min. Inlet Gas Pressure
J. Recovery Rating
K. Max. BTU Input Rating
L. Min. BTU Input Rating
M. Manifold Gas Pressure
N. Certification Stamp
P. Alternate Approval Stamp
Q. Clearances
English Rating Label
English/French Rating Label

11
PRODUCT INFORMATION
General Descriptions
Typical Direct-Vent Water Heater
(Shown Without Venting)
Product Information
Remote Control
With Power Switch
To Hot Water
Faucet(s)
Drain Valve
Water
Filter
Cold Water Supply
Shut-O Valve
*Note: A exible drain tube can be used
To Suitable
Drain
To Suitable
Drain
Power
Supply
Cord
Union
Union
Manual Gas
Supply Line
Shut-O Valve
Manual Gas
Shut-O Valve
(Supplied)
Condensate
Pipe*
Cap
Sediment Trap
Service
Valve
Relief
Valve
Relief
Valve

12
PRODUCT INFORMATION
Typical Outdoor Water Heater
(No Venting Required)
Remote Control
With Power Switch
To Hot Water
Faucet(s)
Drain Valve
Cold Water Supply
Shut-O Valve
*Note: A exible drain tube can be used
To Suitable
Drain
To Suitable
Drain
Power
Supply
Cord
Union
Union
Manual Gas
Supply Line
Shut-O Valve
Manual Gas
Shut-O Valve
(Supplied)
Condensate
Pipe*
Cap
Sediment Trap
Service
Valve
Relief
Valve
Relief
Valve
Hard-Wire
Water
Filter
Flue
Terminal
This water heater is for OUTDOOR installation only.
DANGER:
DO NOT install this water heater indoors or in a confined space. It is designed for outdoor installation only. Any other type of
installation will result in death or serious personal injury.
Product Information

13
Use Instructions
USING YOUR WATER HEATER
WARNING:
• Flammable vapors can be drawn by air currents
from surrounding areas to the water heater. Vapors
can ignite causing death, personal injury, or product
damage.
• DO NOT store or use flammable or combustible
materials (gasoline, paint thinner, adhesives,
solvents, newspapers, rags, mops, etc.) in the
vicinity of the water heater or any other gas
appliance. If they must be used, open doors and
windows for ventilation, and shut off all gas-
burning appliances, including their pilot lights.
• DO turn off manual gas shut-off valve if water
heater has been subjected to overheating, fire, flood,
physical damage, or if the gas supply fails to shut
off.
• DO NOT turn on water heater unless water and gas
supplies are completely opened.
• DO NOT turn on water heater if cold water supply
shut-off valve is closed.
• If there is any difficulty in understanding or
following the operating and care instructions in
this manual, it is recommended that you contact a
qualified service technician to perform the work.
Safety Precautions
Setting the Water Temperature
DANGER
!
HOT
Water temperature over 125°F (52°C)
can cause severe burns instantly or
death from scalds.
Children,disabled and elderly are
at highest risk of being scalded.
See instruction manual before
setting temperature at water
heater.
Feel water before bathing or
showering.
Temperature limiting valves are
available, see manual.
BURN
Time/Temperature Relationship in Scalds
Water Temperature Time to Produce a Serious Burn
120°F (49°C) More than 5 minutes
125°F (52°C) 1 1/2 to 2 minutes
130°F (54°C) About 30 seconds
135°F (57°C) About 10 seconds
140°F (60°C) Less than 5 seconds
145°F (63°C) Less than 3 seconds
150°F (66°C) About 1 1/2 seconds
155°F (68°C) About 1 second
Table courtesy of Shriners Burn Institute
DANGER:
Water temperatures above 125°F (52°C) will result in death and/or
severe burns from scalding.
Safety and energy conservation are factors to be considered when
selecting the water temperature setting. The temperature of the water in
the water heater can be regulated by setting the temperature on the front
of the remote control. Be sure to read and follow the warnings outlined
on the pictured label.
The recommended setting for the water temperature is 100°F (38°C).
The remote control has been preset and shipped at the recommended
temperature setting.
Safety factors should be considered whenever altering the water
temperature setting. The chart below may be used as a guide in
determining the proper water temperature for your home.

14
Use Instructions
USING YOUR WATER HEATER
Maximum water temperature occurs while the
water heater burner is ON. To determine the water
temperature:
Turn on the hot water faucet and place a thermometer
in the water stream.
NOTICE:
Water temperature at the faucet may vary depending on the
season and the length of pipe from the water heater.
The remote control temperature range is between
100°F (38°C) and 120°F (49°C). To adjust the
temperature to a desired setting, press the UP or
DOWN adjustment button on the face of the remote
control. The new temperature set point will show on the
LED display.
NOTICE:
The temperature set point on the standard remote control
cannot be increased above 112°F (44°C) when a hot water
faucet is in the open position. To achieve temperatures
above 120°F (49°C) or 85°F (29°C), contact a qualified
service technician. Only factory-authorized remote control(s)
should be used.
The water heater may not operate with a small water
flow. Increase the water flow and recheck. If it still does
not operate with the hot water faucet completely open,
increase the temperature setting on the remote control.
Water Heater Facts
DANGER:
Water temperatures above 125°F (52°C) will result in death
and/or severe burns from scalding.
• The hottest temperature water will be at the faucet
closest to the water heater.
• Always remember to test the water temperature
with your hand before use.
• Always supervise young children or others who are
incapacitated.
• The water heater is equipped with a device that will
shut off the gas supply to the burner if the water
heater exceeds normal operating temperatures.
• Any water heater that has been subjected to fire,
flood, physical damage, or been under water should
be turned off at the manual gas shut-off valve and
not used until it has been checked by qualified
service personnel.
Temperature
Adjustment
Buttons
Power On/Off
Button and
Indicator
LED Temperature
and Error Code
Display
In-Use Indicator
(Lit during operation)
Priority
Indicator
Setting the Water Temperature (cont.)

15
Venting System (Direct Vent Only)
The venting system should be inspected annually to
ensure all of the vent sections are secure and airtight.
Qualified service personnel are familiar with vent
system inspections and may be contacted for advice.
WARNING:
DO NOT operate the water heater if the vent system shows
signs of leaking exhaust. Leaking exhaust could lead to
death, personal injury, and/or product failure.
For outdoor models, check the air intake and vent
outlet for blockage and/or debris.
DANGER:
Shock Hazard – Make sure the electrical power to the water
heater is OFF before removing protective cover. Electric
shock will cause death or serious personal injury.
Condensate Collector
CAUTIONS:
• Condensate is known to be acidic; refer to federal, state
(provincial), and local codes for proper handling and
discharge methods.
• DO NOT operate without the condensate collector
drain connected and routed to a proper drain that can
handle corrosive condensate. This could cause the
system to malfunction or fail.
On a regular basis, inspect the condensate drain line to
ensure the condensate is draining properly.
The condensate coming from the water heater is
known to be acidic. The heater features a built-in
condensate neutralizer that uses CaCO3 (calcium
carbonate) in rock form as a medium.
Periodically check the medium visually to ensure that it
is not depleted and refill accordingly. It is recommended
that you contact a qualified service technician to
perform the work.
CARING FOR YOUR WATER HEATER
Water Heater Inspections
Condensate Drain
Care Instructions
Vent Outlet
Air Intake
Outdoor models

16
CARING FOR YOUR WATER HEATER
Burner
It is recommended the burner be annually inspected by
a qualified service technician.
DANGER:
Shock Hazard – Removing the front cover panel
exposes you to live electricity. Electric shock will
cause death or serious personal injury.
Remove 6 screws and the unit cover panel.
Turn on a hot water faucet.
While the water heater is operating, inspect the main
burner flames through the burner sight glass. The
flames should be blue when the main burner is firing.
NOTICE:
If the flames are not blue or you observe unusual
burner operation, shut off the water heater and
contact a qualified service technician.
Turn off the hot water faucet and reinstall the unit cover
panel.
4
2
1
Burner
Sight
Glass
3
Water Heater Inspections (cont.)
Care Instructions

17
CARING FOR YOUR WATER HEATER
Care and Cleaning
DANGER:
Shock Hazard – Make certain power to the water
heater is OFF before removing protective cover
for any reason. Electric shock will cause death or
serious personal injury.
WARNING:
Combustible materials, such as clothing, cleaning
materials, or flammable liquids, must not be
placed against or next to the water heater. Fire or
explosion can occur causing death, personal injury,
and/or product damage.
All care and cleaning to and around the water heater
should only be performed with the water heater turned
off and the electrical power supply disconnected.
Vacuum around the water heater to remove any dust,
dirt, and/or lint buildup.
Clean the water heater and the remote control with a
damp soft cloth and mild detergent. Gently wipe and
completely dry all surfaces.
Check the air intake and vent outlet for blockage and/
or debris.
NOTICE:
The air intake requires a minimum of 12 in. (30 cm)
of clearance between the air intake opening and
any obstruction.
Clean the water filter monthly, as described below and
on page 18.
Water Filter Cleaning
Turn off the water heater and disconnect the electrical
power supply.
Turn off the water supply to the water heater.
Drain the water heater. See page 20.
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2
1
Drain Valve
3
Cold Water Supply
Shut-O Valve
2
3
Outdoor models
Care Instructions
Air Intake
Vent Outlet

18
CARING FOR YOUR WATER HEATER
CAUTION:
DO NOT tap or force the filter during removal. This can
deform and/or damage the filter.
Unscrew the water filter from the base of the cold water
inlet line and carefully slide it out of the line.
Clean the water filter under running water. To remove
severe sediment and dirt, use a soft brush.
CAUTION:
DO NOT overtighten the water filter. Overtightening can
deform and/or damage the filter.
Replace the filter in the cold water inlet line and tighten
until it is snug.
Turn on the water supply, reconnect the electrical
supply, and turn on the water heater.
4
7
5
6
Care and Cleaning (cont.)
Care Instructions

19
CARING FOR YOUR WATER HEATER
Preventive Maintenance
WARNING:
Failure to perform routine preventive maintenance can
prevent the water heater from operating properly. Improper
operation can cause carbon monoxide dangers, excessive
water temperatures, and other potentially hazardous
conditions resulting in death, personal injury, and/or
product damage.
Properly maintaining your water heater will ensure
dependable, trouble-free service.
User Preventive Maintenance
Establish and follow a routine preventive maintenance
program. The following suggested items should be
included in your program.
Check and clean the water filter monthly. See “Water
Filter Cleaning” on page 17.
WARNING:
Hot water is released during manual operation of the relief
valve. Make sure all people and animals are clear from
the area before performing this check to prevent death,
personal injury, and/or property damage from hot drain
water.
• Annually check the operation of the pressure relief valve
annually. Lifting the lever handle on the pressure-relief
valve opens the valve to flush hot water through the
discharge line to the drain. After several gallons have
drained, release the lever handle to close the valve and
stop draining.
NOTICE:
If the pressure relief valve on the hot water heater
discharges periodically, this may indicate a problem in the
water system. Contact the water supplier or a plumbing
contractor to correct the problem. DO NOT plug the relief
valve outlet.
• Inspect and keep the area around the water heater clear
and free of flammable materials, such as gasoline and
other flammable vapors and liquids.
• Visually inspect the water heater for damage and/or
denting. If present, contact a service personnel to verify
proper operation.
• Check for abnormal sound during normal operation (e.g.,
hissing or banging noises). Contact a qualified service
technician or plumbing contractor if abnormal sounds are
noted.
• Check all gas and water pipes for leaks. See page 56.
NOTICE:
– DO NOT operate the water heater if you feel
something is wrong with the unit.
– DO NOT allow children to operate or handle
the unit.
• After inspections, maintenance, and/or cleaning, ensure
proper operation by turning on a hot water faucet.
Professional Preventive
Maintenance
It is recommended that a periodic inspection of the water
heater burner, relief valve, air intake filter, water filter, and
venting system be made by a qualified service technician.
WARNING:
Certain water conditions can damage the water heater and
may cause defects, malfunctions or failures of the water
heater that are not covered by the limited warranty. See
page 47 for more detail.
Relief Valve
Care Instructions

20
Care Instructions
CARING FOR YOUR WATER HEATER
Draining the Water Heater
WARNING:
Failure to follow these draining instructions can cause
serious personal injury from scalding and/or product
damage.
Turn off the water heater by pressing the POWER ON/
OFF button on the remote control.
Close the gas shut-off valve(s).
At least 10 seconds after Step 1, unplug the water
heater or disconnect the power supply at the circuit
breaker box.
Open all hot water faucets. Run the water until it is
COLD; then shut off the faucet.
Close the water shut-off valve.
Using a suitable container to catch the water, remove
the water drain plug located at bottom of the water
heater, the water drain valve from the base of the hot
water outlet line, and the water filter from the base of
the cold water inlet line.
Connect a garden hose to the drain valve in the hot
water outlet line and place the other end in a suitable
drain. Open the drain valve until all the water has
drained from the water heater. Leave water heater as is
until placed back in service.
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Cold Water Supply
Shut-O Valve
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