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 24 hour solar pool blanket in use. The existence of shade over the pool will suggest a larger size heat pump. See all heat pumps


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
AT400
84,000
5.5
FS
12 x 24 or smaller
288 or less
LS
12 x 24 - 16 x 32
288 - 512
AT600
114,000
5.6
FS
16 x 32 - 18 x 36
512 - 648
LS
18 x 36 - 20 x 40
648 - 800
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
H100
90,000
5.8
FS
12 x 24 or smaller
288 or less
LS
12 x 24 - 16 x 32
288 - 512
H120
109,000
5.6
FS
12 x 24 - 16 x 32
288 - 512
LS
18 x 36 - 20 x 40
648 - 800
H155
127,000
6.3
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
Sun Power
TH4A
75,000
5.6
FS
10 x 20 or smaller
200 or less
LS
10 x 20 - 12 x 24
200- 288
TH6RR
91,000
5.0
FS
12 x 24 or smaller
288 or less
LS
12 x 24 - 16 x 32
288 - 512
TH6A
97,000
5.0
FS
12 x 24 or smaller
288 or less
LS
12 x 24 - 16 x 32
288 - 512
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 +
Minimax Plus
PLUS400
99,000
4.6
FS
12 x 24 or smaller
288 or less
LS
12 x 24 - 16 x 32
288 - 512
PLUS600
115,000
4.5
FS
16 x 32 - 18 x 36
512 - 648
LS
18 x 36 - 20 x 40
648 - 800
PLUS800
127,000
4.7
FS
18 x 36 - 20 x 40
648 - 800
LS
20 x 50
1000
PLUS1000
145,000
4.5
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.