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Appendices
Reference Guide for Water Heating
BTU/Output = GPH x 8.33 lbs./Gal. x Temp. Rise
BTU/Input = GPH x 8.33 x Temp. Rise
% Efficiency
KW = GPH x 8.33 x Temp. Rise
3413
Temperatures
To convert from degrees Centigrade (C) to degrees Fahrenheit (F)
multiply the number of degrees C by 9/5 (or 1.8) and add 32.
To convert from degrees Fahrenheit (F) to degrees Centigrade (C) first
subtract 32 from the number of degrees F then multiply the remainder
by 5/9 (or 0.556).
Gas/Oil
Gas BTUs
1 lb. of Butane = 21,300
1 Gal. of Butane = 102,600
1 Cu. Ft. of Butane = 3,260
1 Cu. Ft. of Manufactured = 530
1 Cu. Ft. of Mixed = 850
1 Cu. Ft. of Natural = 1,075
1 lb. of Propane = 21,600
1 Gal. of Propane = 91,700
1 Cu. Ft. of Propane = 2,570
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