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SWIMMING POOL HEATER
AND SPA HEATER SIZING

Follow these guidelines to be certain that your heater
will be the correct one for your pool and/or spa.

Be sure that the heater you choose will be capable of raising the water temperature from ambiant to 80 degrees in a 24 hour period. It is a good idea to base sizing on the coldest ambiant temperature because "ambiant" is variable.

Generally speaking, you should install the largest size heater that will fit within your space and budget. This will provide more rapid heating and reduces operation time, extending the life of the unit.

For each degree of difference between the air and water, an uncovered pool loses about 10 BTU's per hour per square foot of surface. For example, a 500 square foot pool with an 80 degree water temperature on a 70 degree day requires 50,000 BTU's per hour simply to maintain the temperature. Since most heaters are actually in the 80-85% efficiency range, the actual requirement would be more in the neighborhood of around 63,000 BTU's.


Manufacturer Sizing Charts

RAYPAK

TELEDYNE LAARS LITE

TELEDYNE LAARS Hi-E 2

HAYWARD

 

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