BASIC INSTALLATION & OPERATION
INSTALLATION OF RESIDENTIAL GAS WATER HEATER
See Labels and Installation Instructions and Use & Care Guide for clearances.
Use Draft Hood
supplied with unit
Exhaust Vent to
Ouside of Building
Union
Water
Valve
Water
Supply- Cold*
*Massachusett: Install a vacuum relief in cold water line per section 19 MGL 142.
Union
To Fixtures - Hot
Expansion Tank 
Pressurize to Equal
Supply Water Pressure* (Relieve water pressure on the expansion tank before adjusting air
| Tempered Water | |
Untempered | To Fixtures | |
Cold | ||
Hot Water | ||
| Water | |
| Inlet | |
Hot |
| |
Water |
| |
Outlet |
| |
Mixing Valve | ||
(Set to 120°F) | ||
Follow the Mixing Valve | ||
Manufacturer’s Instructions | ||
Gas
Supply
Control
Display
pressure.)
with discharge piped to an adequate drain. Do not cap or plug.
Manual Gas Shut-off Valve
Air Intake Chamber
Air is drawn in for combustion. Keep area clean and free from flammables and flammable vapors.
Gas Control Valve/Thermostat Recommended setting of 120°F.**
Do not cap or plug.
Union
Sediment Trap 
(Drip Leg) 3” Minimum. 
FV Sensor
Bracket
6” Maximum Air Gap NOTE: Local codes
may vary.
Drain
Electrical Plug
Metal Drain Pan piped to an adequate drain. NOTE: Drain pan diameter must be at least 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.
**
Figure 1
6