Fuel comparison chart, Cuadro de comparación de com, Charte de comparaison des co – Rheem RESIDENTIAL GENERATOR SYSTEM GEN12S User Manual

Page 13

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11

Fuel Comparison Chart

The fuel comparison chart shown below is provided for your
reference.

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. The table below provides guidance on tank size
selection.

Required Propane Tank Size (Lowest Average Winter Temperature), in Gallons

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

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)

2,500

1,000

Density***

36.39

57.75

Weight†

4.24

2.65

Octane Number:

Research

110+

110+

Motor

97

*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".

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