Swimming Pool Spa and Hot Tub Heater Output Per Hour

There is a formula for anything that you need to accomplish with regards to swimming pools, spas and hot tubs. Whether it’s a chemical adjustment or a piece of equipment that you need to replace and you want to be sure it’s the right size.

This article, as stated in the title, is about choosing the right heater to bring your pool, spa or hot tub water to the desired temperature.

Formula: Heater Output:

            Pool Volume (gal.) x Temp Diff. X 8.33

Ex: 20,000 gal. pool that is 77 degrees and you want to                                 

       heat it to 83. It would be; 20,000 x 6 x 8.33 = 999,600. Thiss means that you would require a 1,000,000 BTU heater to get the pool up to temp in one hour.

Note: 1 BTU = 1 lb of water raised 1 degree F.

Note: 1 gal of water = 8.34 lbs.

To find heater input: Heater Output / Heater Efficiency

Ex: Heater output = 1,000,000 BTUs

Heater Efficiency = 80%

1,000,000 / .8 = 1,250,000BTUs (Heater Input)

Article by: Jef Kirchmaier, CPO, CPT, AEA, WQM

                 

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