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Source Code: WYAARUNK | September 23, 2014
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Now that you have selected the most suitable type of heater for you pool, the next step is to figure what is the best size. Although calculating an exact size is not always easy, you can make your selection based on some basic criteria. The first step is to calculate your pool surface area (Length X Width). The second step is to decide how warm you want your pool water and how fast you want to raise the temperature.

The sizing guides below show the maximum pool surface area that can be heated based on the temperature difference between the air temperature during the coldest month the pool is used and the desired temperature. Figures are based on average wind conditions and average pool depth.

Keep in mind that if you don't find your exact size or have trouble measuring your free form pool, it is always best to go with the next biggest pool heater. The larger the heater is, the faster you can heat the pool, and the heater will last longer too!

Pool Gas Heater
Model 125K BTU 175K BTU 250K BTU 325K BTU 400K BTU
Temp. Difference Minimum Area Heater (length x width)
0 wind 3.5 wind 0 wind 3.5 wind 0 wind 3.5 wind 0 wind 3.5 wind 0 wind 3.5 wind
15 Degrees F 875 675 1,250 925 1,775 1,325 2,300 1,725 2,850 2,125
20 Degrees F 675 500 925 700 1,325 1,000 1,725 1,300 2,125 1,600
25 Degrees F 525 400 750 550 800 1,400 1,400 1,050 1,700 1,300
30 Degrees F 450 325 625 475 700 1,250 1,250 875 1,425 1,075
35 Degrees F 400 300 550 400 575 1,000 1,000 750 1,225 900

Spa Gas Heater
Model 125K BTU 175K BTU 250K BTU 325K BTU 400K BTU
Spa Size Time Required to Raise 30 Degrees
200 Gallons 30 Minutes 25 Minutes 20 Minutes 15 Minutes 10 Minutes
400 Gallons 60 Minutes 45 Minutes 30 Minutes 25 Minutes 20 Minutes
600 Gallons 90 Minutes 65 Minutes 45 Minutes 35 Minutes 30 Minutes
800 Gallons 120 Minutes 90 Minutes 60 Minutes 50 Minutes 40 Minutes
1,000 Gallons 150 Minutes 110 Minutes 75 Minutes 60 Minutes 50 Minutes

In-Ground Heat Pump
Pool Size Square Feet BTU's
12' x 20' 240 100,000+
12' x 24' 288 100,000+
14' x 28' 392 110,000+
15' x 30' 450 110,000+
16' x 32' 512 110,000+
18' x 36' 648 125,000+
20' x 40' 800 125,000+
24' x 44' 1,056 130,000+

Above Ground Heat Pump
Pool Size Square Feet BTU's
18' Round 254 70,000+
21' Round 346 70,000+
24' Round 346 110,000+
28' Round 452 110,000+
12' x 24' Oval 615 70,000+
15' x 24' Oval 226 100,000+
16' x 32' Oval 402 110,000+
18' x 33' Oval 466 110,000+

In-Ground Heat Pump
Pool Size Square Feet 2' x 10' Panels 4' x 20' Panels
12' x 20' 240 2 1
12' x 24' 288 2 1
14' x 28' 392 2 1
15' x 30' 450 4 2
16' x 24' 384 2 1
16' x 32' 512 4 2
18' x 36' 648 4 2
20' x 40' 800 4 2

Above Ground Heat Pump
Pool Size Square Feet 2' x 10' Panels 4' x 20' Panels
18' Round 254 2 1
21' Round 346 2 1
24' Round 346 2 1
28' Round 452 4 2
12' x 24' Oval 615 4 2
15' x 24' Oval 226 2 1
16' x 32' Oval 402 4 1
18' x 33' Oval 466 4 2
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