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INSTALLATION
Step 10:
Gas supply and gas pipe sizing
• Check that the type of gas matches the rating plate first.
• Ensure that any and all gas regulators used are operating properly and providing gas pressures within the
specified range shown below. Excess gas inlet pressure may cause serious accidents.
• The water heater is set only for Natural gas at the factory. If your gas type is LP Gas, gas conversion shall be
required with the included gas conversion kit (100320420) by a qualified installer. (Refer to pp. 11 and 33.)
WARNING
• Failure to follow these warnings could result in severe personal injury, carbon monoxide poisoning, or death.
• DO NOT attach the gas line to the water heater until after supply line pressure testing has been completed to avoid any
damage to the water heater.
• The minimum and maximum inlet gas pressures are:
Gas type
Natural Gas
• Inlet gas pressures that fall outside the range of values listed above may adversely affect the performance of the
water heater. These pressures are measured when the water heater and any other gas appliance served by the
same gas line are in full operation.
• Inlet gas pressure must not exceed the above maximum values; gas pressure above the specified range will cause
dangerous operating conditions and damage to the unit.
• If the gas supply pressure to the heater is greater than the specified maximum, a field-supplied regulator is
required. The regulator must lower the gas pressure within the approved range.
• Install the gas regulator according to the manufacturer's instructions. Some manufacturers may require a certain
amount of straight pipe on the outlet prior to any additional fittings.
• The regulator must be sized for the water heater's minimum to maximum input and provide the specified
pressures that are listed on the rating plate.
• In the absence of minimum install distance stated by the regulator manufacturer, it is recommended that there is
at least 3 ft (1 m) of piping between the regulator outlet and the water heater's inlet gas connection.
A Gas Water Heater Hook-Up Kit is available at your local plumbing supplier, it includes a flexible gas connector with
compression fittings to connect the home's gas line to the water heater's gas
control valve. Follow the kit's installation instructions to attach the flexible gas
connector.
1. Use a 1/2" union to connect gas piping to the water heater's 1/2" male NPT
connection.
2. Install a full port manual gas shutoff valve between the water heater and the
gas supply line.
3. When the gas connections are completed, it is necessary to perform a gas
leak test either by applying soapy water to all gas fittings and observing for
bubbles or by using a gas leak detection device.
• The water heater and its individual shutoff valve must be disconnected
from the gas supply piping system during any pressure testing of that
system at test pressures in excess of 1/2 psi (3.5 kPa).
• The water heater must be isolated from the gas supply piping system by
closing its individual manual shutoff valve during any pressure testing of
the gas supply piping system at test pressures equal to or less than 1/2 psi
(3.5 kPa).
4. Always purge the gas line of any debris and/or water before connecting to
the gas inlet.
Size the gas pipe appropriately to supply the necessary volume of gas required for the water heater
NOTICE
using ANSI Z223.1/NFPA 54 in the USA or B149.1 in Canada or local codes. Otherwise, flow capabil-
ities and output temperatures will be limited.
Step 10:
Min 3.5" W.C. (0.87 kPa) – Max. 10.5" W.C. (2.62 kPa)
Propane
Min 8.0" W.C. (1.99 kPa) – Max. 13.0" W.C. (3.24 kPa)
-Gas connections-
On-Demand Water Heater Installation Manual and Owner's Guide
Gas supply and gas pipe sizing
Inlet gas pressure
STANDARD GAS PIPING
CONFIGURATION
Manual Gas
3" (76.2mm)
Shut-off Valve
Minimum
Check with local
Sediment Trap
utility for
minimum height
31
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