The heat pump should be able to heat the water by approx. 0.20 - 0.25 degrees per hour.
How big does the heat pump for my pool have to be?
Calculating the amount of BTUs required will help you determine the size of the heater for your pool.
To calculate the size heatpump required, as well as running costs, provide the following parameters
What to get for your pool? Find the volume of your pool, and pick a heat pump model with heating increase of 0.25 and above.
That said, heat pumps are designed to provide resilient and reliable heating in a wide range of climates, so a standard-sized heat pump should
Rules For Sizing Your Heat Pump Pool Heater · Size at 4 BTU's per gallon or 1 BTU per litre of water.
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According to the above example, a heat pump size of at least 108,000 BTUs or more would be a good choice.