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Feb 28, 2013
Pool Heater Calculation
by: Anonymous

I just purchased a home with a 65,000 indoor pool.

I am wondering how many BTUs I will need to heat the pool comfortably.

Thanks for the question

It's difficult to say with a degree of accuracy how many BTUs you'll need because I don't know the shape of the pool. The square footage is needed but I can give you the calculations.

  • You need to know the desired temperature for the pool
  • Average temperature for the coldest month of pool use
  • Next, you need to know the temperature rise needed. You'll subtract the average temperature from the coldest month FROM the desired pool temperature.
  • Now you need to know the surface area for the pool

    The calculation is:

    Pool area x temperature rise x 12

  • Rectangular - L X W

  • Round - 3.14 X (Diameter/2) x (Diameter/2)

  • Kidney - .45 X (A + B) L

    For a kidney shaped pool, the "A" is the width in the shallow end and "B" is the width in the deep end, or the widest point.

    I'll do a simple dry run.

    Let's say you have a rectangle pool. Length is 50' and width is 15'. L x W = 750 sq. ft.

  • Desired pool temp. is 80 degrees.
  • Coldest average month is 60 degrees.
    80 - 60 = 20 degrees. This is the temperature rise.
  • Pool surface area is 750 sq. ft.

    So it's 750 x 20 x 12 = 180,000 BTUs.

    Remember to go a little bit over, say about 200,000 BTUs. It's easy to dial it down than have it constantly running.

    Hope this helps.


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