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It is very important to get the right size heater for your pool. Buying a heater too small will not heat your pool quickly or efficiently.
To properly determine the correct size heater for your swimming pool or hot tub, you need to know the following:

The Surface Area of your Pool

This can be done simply by measuring the exterior of your pool (Length X Width = square feet surface area of your water)
A round pool surface area = (Radius x Radius X 3.143)
But also keep in mind if your pool is a little shallower than a normal pool you may not need a large heater, the opposite goes for a deeper pool.

Volume of your Pool in U.S. Gallons = (Surface area X average depth X 7.5)

Knowing the volume(gallons) of your pool will allow for the best estimate of what size heater you need.

Click here to use our Pool Volume Calculator


Small: Up to 10,000 Gallons

Stainless Steel Heat Exchanger (60 total feet of pipe, handles up to 65-70 GPM)

Comes with a 24" long, 8" diameter chimney pipe, cap & magnetic thermometer.

Average BTU output 70,000 to 80,000

Measures 21" high x 20" wide x 33" long and weighs 265 lbs. (Heater Stands 4' 6" At Top Of Chimney Cap)

Inside of fire box measures 28" deep
17" wide and 14.5" tall.

Can heat an 8,000 gallon pool by 1.0 full
degree per hour, with a solar cover and air temps over 65.

Capable of increasing the water temp from 60 to 85 degrees in 2-3 days in a 8,000 gallon pool while covered with a solar blanket.

 

 


Large: 10-40,000 Gallons

Stainless steel Heat Exchanger    (75 total feet of pipe, handles up to 60-65 GPM)

Comes with a 24" long, 8" diameter chimney pipe, cap & magnetic thermometer.

Average BTU output 150,000   

Measures 32" high x 27" wide x 33" long and weighs 440 lbs.    (Heater Stands 5' 6" At Top Of Chimney Cap)

Inside of fire box measures 27" deep 17.5" wide and 21" tall.

Can heat a 20,000 gallon pool by 1.0 of a degree per hour with a good fire, solar blanket and air temps above 65.

Capable of increasing the water temp from 60 to 85 degrees in 3 days on a 20,000 to 30,000 gallon pool while covered with a solar blanket.

 

 

X-Large: 40,000 Gallons+

Stainless steel Heat Exchanger  (120 total feet of pipe, handles up to 55-60 GPM)

Comes with a 24" long, 8" diameter chimney pipe, cap & magnetic thermometer.

Average BTU output 180,000 to 200,000 

Measures 42" high x 27" wide x 33" long and weighs 520 lbs. (Heater Stands 6' 4" At Top Of Chimney Cap)

Inside of fire box measures 27" deep 17.5" wide and 21" tall.

Can heat a 25,000 gallon pool by 1.0 of a degree per hour with a good fire, solar blanket and air temps above 65.

Capable of increasing the water temp from 60 to 85 degrees in 3 days on a 25,000 to 35,000 gallon pool while covered with a solar blanket.

 

 


Compare
Choose a category below. To compare heaters to which is right for you

Choosing a Heater
Heater Sizing
Heating Charts
Ask our Opinion




Useful Resources
Additional Information related to pools and pool heating.

Pool Volume Calculator
Energy Saving
Heater Setup
Wood Info





 


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