What Size Swimming Pool Heat Pump Do I Need?

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It is still warm outside but in another couple of months temperatures will start to drop. Now is the time to consider purchasing a pool heater if you don’t already own one.

A common question that consumers ask us when shopping for swimming pool heat pumps is: “How big does my heat pump need to be?” You should have a trained swimming pool professional size your swimming pool heat pump, as its size will depend on many factors. There are, however, general formulas we provide to our customers to approximate heat pump size. We explain how to use these formulas in this article.

Heat pumps are sized according to required BTU (British Thermal Unit) per hour of the swimming pool. Consumer often make the mistake of purchasing under-sized units – units with insufficient BTU output per hour. Under-sized units must run longer in order to heat swimming pools. These longer run times translate to decreased efficiency and higher operating costs. Use the following instructions to approximate the BTUs per hour your heat pump will require.

  1. Determine your desired water temperature in °F.
  2. Determine the average air temperature of the coldest month during which you plan to use your swimming pool in °F.
  3. Subtract the average air temperature from your desired water temperature to calculate the required temperature rise.
  4. Calculate the surface area of your swimming pool in ft2:
    1. Circular pools: radius x radius x 3.14
    2. Kidney-shaped pools: length x width x 0.75
    3. Oval-shaped pools: (0.50 x length) x (0.50 width) x 3.14
    4. Rectangular pools: length x width
  5. Calculate the required BTU output per hour: surface area x temperature rise x 12

 

By following these steps, you can quickly and easily approximate your required heater size. Remember, however, that only a licensed swimming pool professional such as Brother’s Pools can perform a proper sizing analysis!

Information in this article was taken from AquaCal – makers of fine Swimming Pool / Spa Heat Pumps.

 

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250 Main Street. (RT 150)
Wallingford Connecticut 06492
P: (203) 265-5980
F: (203) 294-1601
E: info@brotherspool.com

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In Connecticut take I-91 North or South to exit 15. Take Route 68 West towards Wallingford and Cheshire. Turn left at the intersection of 68 and 150 (Main Street). Brothers Pool is about 1 mile on the left.

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