RESIDENTIAL GAS AND ELECTRIC WATER HEATER
SERVICE HANDBOOK
A.O. Smith Water Products Company
Training Department
©
2002
Ashland City, Tennessee
5
INSTALLATION OF RESIDENTIAL GAS WATER HEATER
Exhaust Vent to
Outside of Building
Union
See Manual and
Labels For Installation
Clearances
Temperature And
Pressure Relief
Valve – Do Not
Reuse Old Valve.
Expansion Tank
Pressurize to Equal
Supply Water
Pressure
Water
Shut Off
Valve
Temperature and
pressure relief valve
tube piped to within 6”
of drain.
Thermostat –
Recommending
setting of 125
°
F.
Safety Pan – Piped to
Drain
Drain
Inner and
Outer Doors –
Reinstall After
Lighting Pilot.
Air Is Drawn In For
Combustion. Keep
Area Clean And Free
From Flammables And
Flammable Vapors
Maximum Gas Supply
13.8” w.c. or ½ PSI
Minimum
4.5” w.c. –Natural Gas
11.0” w.c. Propane Gas
Installation Must Follow Local Codes and Instruction Manual Guidelines
Union
Typical Model
and Rating
Plate Location
