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Briggs & Stratton Power Products Standby Generator
Installation, Start-Up and Owner’s Manual
Fuel Comparison Chart
* 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".
Size of Propane Tank Required at Various Temperatures When Kept at Least
Half Full
Given the gas withdrawal rate and the lowest average winter temperature, an installer can specify the required LP storage
tank size:
Physical Properties
Propane
Natural Gas
Normal Atmospheric State
Gas
Gas
Boiling Point (in °F):
Initial
-44
-259
End
-44
-259
Heating Value:
BTU per gallon (Net LHV*)
83,340
63,310
BTU per Gallon (Gross**)
91,547
Cubic Feet (Gas)
2,516
1,000
Density***
36.39
57.75
Weight†
4.24
2.65
Octane Number:
Research
110+
110+
Motor
97
Fuel Comparison Chart
Withdrawal Rate
32°F
20°F
10°F
0°F
-10°F
-30°F
-40°F
50 CFH
115
115
115
250
250
400
600
100 CFH
250
250
250
400
500
1000
1500
150 CFH
300
400
500
500
1000
1500
2500
200 CFH
400
500
750
1000
1200
2000
2500
300 CFH
750
1000
1500
2000
2500
4000
5000
Required Propane Tank Size (Lowest Average Winter Temperature), in Gallons