BASIC INSTALLATION & OPERATION
INSTALLATION OF RESIDENTIAL GAS WATER HEATER
See Labels and Installation Instructions
Exhaust Vent to
Ouside of Building
Water
Valve
Water
Supply- Cold*
and Use & Care Guide for clearances.
Union
To Fixtures - Hot
Union
*Massachusett: Install a vacuum relief in cold water line per section 19 MGL 142.
Expansion Tank 
Pressurize to Equal
Supply Water Pressure* (Relieve water pressure on the expansion tank before adjusting air pressure.)
| Tempered Water |
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Untempered | To Fixtures | Gas Supply | |
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Hot Water |
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| Water |
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| Inlet |
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Hot |
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Water |
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Outlet |
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Mixing Valve |
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(Set to 120°F) |
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Follow the Mixing |
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Valve Manufacturer’s |
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Instructions |
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Union |
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Sediment Trap
(Drip Leg) 3” Minimum.
with discharge piped to an adequate drain. Do not cap or plug.
Manual Gas
Shut-off Valve
Gas Control Valve/Thermostat Recommended setting of 120°F.*
Do not cap or plug.
6” Maximum Air Gap
NOTE: Local codes
may vary.
Drain
Air is drawn in for combustion. 
Keep area clean and free from flammables and flammable vapors.
Metal Drain Pan piped to an adequate drai NOTE: Drain pan diameter must be at leas 2 inches wider than the diameter of the water heater.
The water heater must be installed according to all local and state codes or in the absence of local and state codes, the “National Fuel Gas Code”’ ANSI Z223.1(NFPA 54)- current edition.
*NOTE: If on a well system the expansion tank should be set to the maximum pressure of the pump tank.
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Figure 1
8