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The necessary size (or horsepower) of the pump can be determined by the following general rule-for above ground pools up to 24 ft round, use a 1 HP pump and for above ground pools over 24 ft round, use a 1.5 HP pump.
Pool Heat Pump Sizing. Pool heat pumps range in size from 50K BTUâs to over 150K BTUâs â the size that will work best for you depends on the size of your pool, whether or not you cover the pool, how windy the pool area is, and how hot you want to keep the pool water.