RESIDENTIAL GAS AND ELECTRIC WATER HEATER
SERVICE HANDBOOK
General Section – continued
%Thermal Efficiency = (GPH X 8.25 X Temp. Rise X 1.0) divided by BTU/H Input
BTU Output = GPH X 8.25 X Temp. Rise X 1.0
GPH = (BTU/H Input X % Eff.) divided by (Temp. Rise X 8.25)
One cubic foot of Natural Gas contains about 1000 BTU of heat.
One “therm” is equal to 100,000 BTU
One cubic foot of Propane Gas contains about 2500 BTU of heat.
One gallon of Propane gas contains about 91,250 BTU of heat.
One pound of Propane gas contains about 21,600 BTU of heat.
One pound of gas pressure is equal to 27.7 inches water column pressure Inches of Water Column X .036091 = PSI
Inches of Water Column X .073483 = Inches of Mercury (Hg.)
Centimeters = Inches X 2.54
MM(millimeters) =Inches X 25.4
Meters = Inches X .0254
Doubling the diameter of a pipe will increase its flow capacity (approximately) 5.3 times.
CONSTRUCTION:
Tank is constructed of steel.
The inside of the tank is constructed of a glass lining bonded to the steel. This prevents water to metal contact and rusting of the tank.
An anode rod will be installed within the tank. The
All water heaters will contain at least one thermostat (to operate the heater) and one high limit (to prevent water temperatures approaching the “steam” level).
A.O. Smith Water Products Company | 4 | Training Department | |
©2002 | Ashland City, Tennessee | ||
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