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Gas Supply
INSTALLATION INSTRUCTIONS
Gas Supply System
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. Doing so could result in death, personal injury,
explosion or fire, product damage, and/or poor operating
conditions or performance.
NOTICE:
• Gas piping shall be in accordance 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. In Canada, use the latest edition of
CAN/CSA B149.1, Natural Gas and Propane installation
code.
• Apply a thin coat of pipe compound to all threaded male
ends. Compound must be of the type resistant to the
action of LP gas.
• To ensure proper water heater operation, the gas pipe and
gas meter must be sized correctly.
• If flexible connectors are used, the minimum inside
diameter must be 3/4" or greater and the rated capacity
of the connector must be equal to or greater than the
BTU capacity of the water heater. See manufacturer
information for the gas connector. Lengths over 36 inches
are not recommended.
• DO NOT use excessive force when tightening the pipe
sections. Excessive force can damage the water heater,
especially when Teflon pipe compound is used.
Gas Supply
Union
Manual Gas
Supply Line
Shut-O Valve
Cap
Sediment Trap
Manual Gas
Shut-O Valve
Gas Piping
Pipe-Sizing Procedure – The gas supply system
must be properly sized to ensure the proper
operation of this tankless water heater as well as all
the gas appliances on the system. Failure to ensure
the gas system, (meter, regulators, and piping) are
properly sized could result in improper operation
of this or other gas appliances. Insufficient gas
pressure/supply can cause pilot outages, lockouts,
or operating conditions that could lead to an
appliance failure, improper combustion, carbon
monoxide, sooting, or fire. Gas line sizing is based
on gas type, the pressure drop in the system, the
gas pressure supplied, and the gas line type. For
gas pipe sizing in the United States, refer to the
National Fuel Gas Code, (NFPA 54, ANSI Z223.1).
For Canadian gas pipe sizing, refer to the Natural
Gas and Propane Installation Code CAN/CSA
B149.1.
These simplified instructions only address low
pressure gas systems using Schedule 40 Metallic
Pipe (Black Iron). For hybrid gas systems,
high pressure main lines with regulators at the
appliances, gas systems piped with corrugated
stainless steel tubing (CSST), or Propane gas
systems.
Determining the required
regulator and gas meter size.
Find the BTU capacity of each appliance on the
system. This information is located on a rating label
attached to the appliance. Total the BTU of all the
appliances together and divide that by the heating
value of the fuel (for natural gas the average is 1,024
or 2,546 for propane). This will give you the total
cubic feet per hour of gas required for the system.
At your gas meter/regulator there will be a rating
plate that gives the cubic feet per hour capacity
of that equipment. If the total gas required for the
system is greater than the rating of the meter/
regulator then the local gas company will need
to be contacted in order to upgrade the meter/
regulator for the system.
Cubic Feet
Per Hour (CFH) =
Gas Input of
Water Heater (BTU/HR)
Heating Value of Gas (BTU/FT
3
)
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