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RESIDENTIAL GAS AND ELECTRIC WATER HEATER
SERVICE HANDBOOK
INSTALLATION OF RESIDENTIAL GAS WATER HEATER
Typical Model
and Rating
Plate Location
Union
Minimum
4.5” w.c. –Natural Gas
11.0” w.c. Propane Gas
Maximum Gas Supply
13.8” w.c. or ½ PSI
Air Is Drawn In For
Combustion. Keep
Area Clean And Free
From Flammables And
Flammable Vapors
Inner and
Outer Doors –
Reinstall After
Lighting Pilot.
Drain
Safety Pan – Piped to
Drain
Thermostat –
Recommending
setting of 125F.
Temperature and
pressure relief valve
tube piped to within 6”
of drain.
Water
Shut Off
V
alve
Temperature And
Pressure Relief
Valve – Do Not
Reuse Old Valve.
Expansion Tank
Pressurize to Equal
Supply Water
Pressure
See Manual and
Labels For Installation
Clearances
Union
Exhaust Vent to
Outside of Building
Installation Must Follow Local Codes and Instruction Manual Guidelines
A.O. Smith Water Products Company Technical Training Department
©2005 Ashland City, TN
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