Guide To Pool Heating

Page 35 of 51

How To Calculate Pool Heating Costs
When You Use Liquid Propane Gas

This is a cost estimating template. Simply fill in the appropriate numbers and perform the
simple calculations shown. This template will help you to determine the cost of operating a
swimming pool heater fueled with liquid propane gas.

A.

Cost Per Gallon of Propane Gas
Note: Call your gas company for your cost
Example: $1.69 per gallon

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B.

Cost Per Therm = 1.0833 x A
100,000 ÷ 92,210 Btus/per gallon = 1.0833 factor

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C.

BTU/Hour Rating of Propane Gas Heater
Note: Look on Gas Heater Name Plate
Or, call the pool dealer who installed heater.
Example: 150,000 Btus/hour rating.

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D.

Efficiency Rating of Heater
Note: Look on Heater Name plate oruse .7(70%)

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E.

Therms per hour used = ((C ÷ D) ÷100,000)
Note: Input btus xefficiency = Output btus (rating)
Example: 150,000 output rating ÷ .7 = 214,285
214,285 input required ÷ 100,000 = 2.14 therms/hr

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F.

Hours per day heater is used

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G.

Daily Operating Cost = (B x E x F)

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Example:
1.69x 2.14 x 6 hrs/day = $21.70/day

H.

Days in the month heater is used

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I.

Monthly Operating Cost = (G x H)

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Example:
21.70x 20 days per month = $434.00.