Fuel Comparison Chart
Physical Properties | LP Vapor | Natural |
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| Gas |
Normal Atmospheric State | Gas | Gas |
Boiling Point (in °F): |
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Initial | ||
End | ||
Heating Value: | 83,340 | 63,310 |
BTU per gallon (Net LHV*) | ||
BTU per gallon (gross**) | 91,547 |
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Cubic feet (gas) | 2,500 | 1,000 |
Density*** | 36.39 | 57.75 |
Weight† | 4.24 | 2.65 |
Octane Number: |
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Research | 110+ | 110+ |
Motor | 97 |
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* LHV (Low Heat Value) is the more realistic rating.
** Gross heat value does not consider heat lost in the form of water during combustion.
*** Density is given in “Cubic Feet of Gas per Gallon of Liquid”.
† Weight is given in “Pounds per Gallon of Liquid”.
Required Propane Tank Size
The required size of the propane tank at various temperatures when kept at least half full is shown below in the chart. Given the gas withdrawal rate and the lowest average winter temperature, an installer can specify the required LP storage tank size.
Withdrawal Rate | 32° F | 20° F | 10° F | 0° F |
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50 CFH | 115 | 115 | 115 | 250 | 250 | 400 | 600 |
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100 CFH | 250 | 250 | 250 | 400 | 500 | 1000 | 1500 |
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150 CFH | 300 | 400 | 500 | 500 | 1000 | 1500 | 2500 |
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200 CFH | 400 | 500 | 750 | 1000 | 1200 | 2000 | 2500 |
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300 CFH | 750 | 1000 | 1500 | 2000 | 2500 | 4000 | 5000 |
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14 | BRIGGSandSTRATTON.COM |
