| |
How to Pick the Right Size Heater
Proper heater size is based on the time required to heat the pool or
spa. If water is heated for each intended use, energy-saving rapid
heating may be appropriate.
If water is gradually heated to the desired temperature and then
maintained at that temperature, a smaller heater may be acceptable. To
determine proper heater
size, use the following formula.
|
|
|
______ |
Desired water
temperature (°F) |
|
(minus) –
|
______ |
Average air
temperature (°F) |
|
(equals) =
|
______ |
Required
temperature rise (°F) |
|
(divided) ÷
|
______ |
Required time
to heat pool/spa to desired water temp. (hours) |
|
(equals) =
|
______ |
Required
temperature rise per hour (°F) |
|
|
| |
|
|
Pool Size
- Square Feet
|
|
300 |
400 |
500 |
600 |
700 |
800 |
1000 |
| |
|
|
|
|
|
|
|
Model |
Desired
temperature rise in °F per hour |
|
206
|
1-1/2
|
1-1/4
|
1
|
1
|
3/4
|
-
|
- |
|
266
|
2
|
1-3/4
|
1-1/2
|
1-1/2
|
1
|
3/4
|
|
|
336
|
3
|
2
|
2
|
1-3/4
|
1-1/4
|
1
|
3/4 |
|
406
|
3-1/2
|
2-3/4
|
2-1/2
|
2
|
1-1/2
|
1-1/4
|
1 |
|
| |
|
|
Model
|
Spa Size -
Gallons
|
|
300
|
400
|
500
|
600
|
700
|
800
|
1000
|
|
Desired
temperature rise in °F per hour
|
|
206
|
65
|
49
|
39
|
33
|
28
|
25
|
20
|
|
266
|
87
|
65
|
52
|
44
|
37
|
33
|
26
|
|
336
|
109
|
82
|
65
|
55
|
47
|
41
|
33
|
|
406
|
131
|
98
|
79
|
65
|
56
|
49
|
39
|
|
