Heat pump sizing

Heat Pump Sizing

Sizing of a heat pump pool heater is based on the pool's surface area, geographic location, environmental conditions such as shading, wind, blanketing against night time heat losses, and more. Below are general sizing guidelines assuming the pool is in full sun and a solar pool blanket is in use. The existence of shade over the pool will suggest a larger size heat pump


If your pool is...

Aboveground Round Pool: 12 feet up to 15 feet
Aboveground Oval Pool: 10 x 15 feet up to 12 x 18 feet

consider this choice:

If your pool size is...

Aboveground Round Pool: 18 feet up to 21 feet
Aboveground Oval Pool: 12 x 14 feet up to 15 x 14 feet
Inground Pool: UP TO 10 x 20 feet

consider these choices:

If your pool size is...

Aboveground Round Pool: 24 feet
Aboveground Oval Pool: 15 x 30 feet
Inground Pool: UP TO 12 x 24 feet

consider these choices:

If your pool size is...

Aboveground Round Pool: 28 feet to 30 feet
Aboveground Oval Pool: 18 x 33 feet to 20 x 40 feet
Inground Pool: 14 x 28 feet to 16 x 32 feet

consider these choices:

If your pool size is: 16 x 32 feet to 18 x 36 feet;
consider these choices:

If your pool size is: 18 x 36 feet to 20 x 40 feet;
consider these choices:

If your pool size is: 20 x 50 feet;
consider these choices:


FS = Full Season
LS = Limited Season

Model BTU COP FS/LS Pool Size Sq Ft
Aquatherm Titanium
AT700 109,000 5.7 FS 12 x 24 - 16 x 32 288 - 512
LS 18 x 36 - 20 x 40 648 - 800
AT1200 126,000 5.7 FS 18 x 36 - 20 x 40 648 - 800
LS 20 x 50 1000
Aquatherm CuproNickel
AT500 102,000 4.6 FS 12 x 24 - 16 x 32 288 - 512
LS 18 x 36 - 20 x 40 648 - 800
HeatWave
H110 102,500 5.8 FS 12 x 24 or smaller 288 or less
LS 12 x 24 - 16 x 32 288 - 512
H120 110,000 5.6 FS 12 x 24 - 16 x 32 288 - 512
LS 14 x 28 - 16 x 32 392 - 512
H135 120,500 5.7 FS 14 x 28 - 16 x 32 392 - 512
LS 18 x 36 - 20 x 40 648 - 800
H155 132,000 6.0 FS 18 x 36 - 20 x 40 648 - 800
LS 20 x 50 1000
HeatWave Icebreaker
H100R 88,000 5.6 FS 12 x 24 - 16 x 32 288 - 512
LS 18 x 36 - 20 x 40 648 - 800
H120R 103,000 5.4 FS 12 x 24 - 16 x 32 288 - 512
LS 18 x 36 - 20 x 40 648 - 800
H155R 120,000 6.1 FS 16 x 32 - 18 x 36 512 - 648
LS 18 x 36 - 20 x 40 648 - 800
Tropical
T115 104,000 4.3 FS 12 x 24 - 16 x 32 288 - 512
LS 18 x 36 - 20 x 40 648 - 800
T135 126,000 5.7 FS 18 x 36 - 20 x 40 648 - 800
LS 20 x 50 1000
SunTech
ST450 100,000 4.6 FS 12 x 24 - 16 x 32 288 - 512
LS 18 x 36 - 20 x 40 648 - 800
Raypak
6300ti 115,000 5.5 FS 16 x 32 - 18 x 36 512 - 648
LS 18 x 36 - 20 x 40 648 - 800
8300ti 137,000 6.1 FS 20 x 50 1000
LS 20 x 50 or larger 1000 +
GulfStream
GS1000 113,000 5.0 FS 16 x 32 - 18 x 36 512 - 648
LS 18 x 36 - 20 x 40 648 - 800
GS1500 130,000 5.4 FS 18 x 36 - 20 x 40 648 - 800
LS 20 x 50 1000
GulfBreeze
GB1000 112,000 5.2 FS 16 x 32 - 18 x 36 512 - 648
LS 18 x 36 - 20 x 40 648 - 800
Heat Siphon
HS2.25 50,000 5.0 FS 10 x 20 200
LS 12 x 24 or smaller 288
HS3.25 72,000 5.0 FS 10 x 20 or smaller 200 or less
LS 10 x 20 - 12 x 24 200 - 288
HSSX3.25 70,000 6.2 FS 10 x 20 or smaller 200 or less
LS 10 x 20 - 12 x 24 200 - 288
HS5.0 100,000 5.0 FS 12 x 24 - 16 x 32 288 - 512
LS 18 x 36 - 20 x 40 648 - 800
HSSX5.0 95,000 6.8 FS 12 x 24 or smaller 288
LS 12 x 24 - 16 x 32 288 - 512

For specific Heat Pump sizing, please complete the sizing form and fax to 800-897-6527 and we will prepare a free cost of operation and pool heater sizing analysis.

BTU: British thermal unit. A BTU is the measured amount of heat output the unit will produce. The BTU output will fluctuate with the outside air temperature and humidity levels

COP: The coefficient of performance of a heat pump is the measured ratio of kilowatt usage compared to the kilowatt output. The greatest value a heat pump provides a pool owner is to deliver a warm pool or hot spa at the lowest possible cost of operation.

FS: Full Season: All months where daytime temperatures are 50 degrees or above – generally this is twice the normal or traditional swim season, i.e. in northeast the traditional season is late May to the first week in September – full season is May 1st through November 1st (6 months) – our solar sizing map shows the full season capability nationwide

LS: Limited Season: Months where swimming may be possible without heat or with little heat needed.

The samples above show one heat pump for two different size pools: the smaller pool can be heated with the heat pump for the entire swimming season, the larger pool can be heated with the same heat pump but only during the hotter months of the year.