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° | ||