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Water Facts

One gallon of fresh water = 8.33 Lbs.
One cubic foot of water = 7.48 Gallons
One cubic foot of water = 62.4 Lbs.
One U.S. Gallon = 231 Cubic inches

Formulas for Water Heating Calculations

%Efficiency = GPH x 8.33 x Temp. Rise
BTU/Hr. Input
   
BTU Input = GPH x 8.33 x Temp. Rise
%Efficiency*
  *%Efficiency for gas is 76%
(as of January 1, 1994)
Electric is 100%
BTU Output = GPH x 8.33 Lbs/Gal. x Temp. Rise    
kW = GPH x 8.33 x Temp. Rise
3413
or GPH x Temp. Rise
410
GPH = kW x 3413
Temp. Rise x 8.33
or kW x 410
Temp. Rise
Rise (°F) = kW x 3413
GPH x 8.33
or kW x 410
GPH
1 kW = 3413 BTU = 4.1 GPH at 100° Temp. Rise
1 kW = 1000 Watts   BTU x 0.293 = Watts
1 BTU = Amount of heat required to raise the temperature of 1Lb of water 1°