Rheem Tankless Water Heater User Manual
This water heater is certified for installations up to 3,280
feet (1000 m) above sea level. The input rating of this
water heater is based on sea level operation. At higher
elevations, the actual input rate may be lower than the
value listed on the rating label.
feet (1000 m) above sea level. The input rating of this
water heater is based on sea level operation. At higher
elevations, the actual input rate may be lower than the
value listed on the rating label.
NOTICE: Select High Altitude models are available.
One model is available for use at elevations above
3,280 feet (1,000 m) up to 6,560 feet (2,000 m), and
an additional model is available for use at elevations
above 6,560 feet (2,000 m) up to 9,840 feet (3,000 m).
One model is available for use at elevations above
3,280 feet (1,000 m) up to 6,560 feet (2,000 m), and
an additional model is available for use at elevations
above 6,560 feet (2,000 m) up to 9,840 feet (3,000 m).
NOTICE: For installations above 3,280 feet (1,000 m)
elevation, the Altitude Chip on the PC board must be
replaced. Do not install this water heater at elevations
above 3,280 feet (1,000 m) without installing the
proper Altitude Chip. Please contact your installer,
local gas supplier, place of purchase or the Customer
Service phone number as listed in this Use & Care
Manual for more information.
elevation, the Altitude Chip on the PC board must be
replaced. Do not install this water heater at elevations
above 3,280 feet (1,000 m) without installing the
proper Altitude Chip. Please contact your installer,
local gas supplier, place of purchase or the Customer
Service phone number as listed in this Use & Care
Manual for more information.
High Altitude
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).
Valve must be installed at the gas connection of
the water heater at the time of installation (see
diagram to the left).
The branch gas supply line to the water heater
should be a minimum of 3/4” black steel pipe
or other approved gas piping material.
should be a minimum of 3/4” black steel pipe
or other approved gas piping material.
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) ANSI Z223.1 and CAN B149 code
mandates a manual gas shut-off valve: See
NFGC & B149 for complete instructions.
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) ANSI Z223.1 and CAN B149 code
mandates a manual gas shut-off valve: See
NFGC & B149 for complete instructions.
If flexible connectors are used, the maximum
length shall not exceed 36” (91 cm).
length shall not exceed 36” (91 cm).
If lever type gas shut offs are used, they shall be
T-Handle type.
T-Handle type.
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.
gas piping must be of the type resistant to the
action of LP gas. Use compound sparingly on
male threads only.
A sediment trap should be installed at the
bottom of the gas line.
bottom of the gas line.
Do not use excessive force (over 31.5 ft lbs.
[42.7 Nm]) in tightening the pipe, particularly if
teflon pipe compound is used, as the unit may
be damaged.
[42.7 Nm]) in tightening the pipe, particularly if
teflon pipe compound is used, as the unit may
be damaged.
The inlet gas pressure to the water heater must
not exceed 10.5” w.c. (2.6 kPa) for natural or
14” w.c. (3.5 kPa) for LP gas. For purposes
of input adjustment, the minimum inlet gas
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.
not exceed 10.5” w.c. (2.6 kPa) for natural or
14” w.c. (3.5 kPa) for LP gas. For purposes
of input adjustment, the minimum inlet gas
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.
NOTICE: To ensure proper operation of the
heater the gas pipe and gas meter must be
sized correctly.
heater the gas pipe and gas meter must be
sized correctly.
Gas piping shall be in accordance with local,
utility company requirement and/or in the
absence of local codes, use the latest edition
of the National Fuel Gas Code. In Canada, the
latest edition of CSA B149.1 Natural Gas and
Propane installation code.
utility company requirement and/or in the
absence of local codes, use the latest edition
of the National Fuel Gas Code. In Canada, the
latest edition of CSA B149.1 Natural Gas and
Propane installation code.
Manual
Gas
Supply
Line
Shutoff
Manual Gas
Appliance
Shutoff
Union
Sediment Trap
Cap
(Valve)
(Supplied)
Leak Testing
The water heater and its gas connections must
be leak tested at normal operating pressures
before it is placed in operation.
be leak tested at normal operating pressures
before it is placed in operation.
Turn on the gas shut-off valve(s) to the
water heater.
water heater.
Use a soapy water solution to test for
leaks at all connections and fittings.
Bubbles indicate a gas leak that must
be corrected.
leaks at all connections and fittings.
Bubbles indicate a gas leak that must
be corrected.
The factory connections should also be leak
tested after the water heater is placed in
operation.
tested after the water heater is placed in
operation.
Pressure Testing the Gas Supply System
The water heater and its manual gas shut-off
valve must be disconnected from the gas
supply piping system during any pressure
testing of the system at pressures in excess
of 1/2 psi (14” w.c. [3.5 kPa]).
valve must be disconnected from the gas
supply piping system during any pressure
testing of the system at pressures in excess
of 1/2 psi (14” w.c. [3.5 kPa]).
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. [3.5 kPa]).
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. [3.5 kPa]).
WARNING: Never use
an open flame to test for
gas leaks, as property
damage, personal injury,
or death could result.
gas leaks, as property
damage, personal injury,
or death could result.
WARNING: Install a
gas pressure regulator, in
the gas supply line, which
does not exceed the
maximum supply pressure.
the gas supply line, which
does not exceed the
maximum supply pressure.
DO NOT use an industrial
type gas regulator.
type gas regulator.
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