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Gas Pool Heater Sizing


Proper heater size is based on the time required to heat pool or spa to the desired temperature.

  • If water is heated for each intended use and rapid heating is desired, a larger unit is required.
  • If water is gradually heated to the desired temperature and then maintained at that temperature, a smaller heater may be acceptable.

First determine desired temperature rise per hour using the chart below:



Temperature rise per hour formula:
_____ desired water temperature (F)
minus
_____ average air temperature (F)
equals
_____ required temperature rise (F)
divided
_____ required hours to heat to desired water temp.
equals
_____ required temperature rise per hour (F)


Gas Pool Heater sizes are determined by their BTU* output. Use the chart below to determine BTU required to raise the water temperature depending on the pool size.


POOL SIZE - SQUARE FEET
sq. ft. >>
300
400
500
600
700
800
1000
BTUs
Desired Temperature Rise in F per hour
200,000
1-1/2
1-1/4
1
1
3/4
-
-
250,000
2
1-3/4
1-1/2
1-1/2
1
3/4
-
300,000
3
2
2
1-3/4
1-1/4
1
3/4
400,000
3-1/2
2-3/4
2-1/2
2
1-1/2
1-1/4
1
SPA/TUB SIZE - GALLONS
gallons >>
300
400
500
600
500
800
1000
BTUs
Desired Temperature Rise in F per hour
200,000
59
45
36
30
25
22
18
250,000
84
63
51
42
36
32
25
300,000
104
78
63
52
45
40
32
400,000
128
96
77
64
55
48
38


* BTU stands for British Thermal Unit. A BTU is defined as the amount of heat required to raise the temperature of one pound of water by one degree Fahrenheit.

Gas Heaters for
Inground Pools

RayPak R Series
RayPak LowNOx
Pentair Minimax
Hayward H-Series
Jandy Laars Lite2
Jandy Laars Hi-E2
Jandy Laars LX/LT

Gas Heaters for AboveGrnd Pools

Pentair Minimax
Hayward H-Series



Compare Solar, Electric and Gas:

Comparison Chart

Learn How To:

Extend your swimming season


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