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How do you calculate the heat pump for a swimming pool?

Published in Pool Heating Calculation 2 mins read

To calculate the power needed for a swimming pool heat pump based on pool volume, you typically divide the pool's volume by a specific conversion factor.

Calculating Required Pool Heat Pump Size

Determining the correct size (usually measured in kilowatts or kW) for your swimming pool heat pump is crucial for efficient heating. An undersized pump will struggle to reach or maintain the desired temperature, while an oversized one costs more upfront and might cycle inefficiently.

Based on standard methods and the provided reference, a common approach involves using your pool's volume.

The Calculation Method

The reference states a direct calculation using the pool volume:

  • Step 1: Find your pool's volume. This is usually measured in litres (L) or gallons.
  • Step 2: Divide your pool volume by a conversion factor. The provided reference uses a conversion factor of 2500.

The formula is:

Required Heat Pump Power (kW) = Pool Volume (L) / 2500

Example Calculation

Let's use the example provided in the reference to illustrate this:

  • Pool Volume: 36,000 litres
  • Calculation: 36,000 L / 2,500
  • Result: 14 kW

Therefore, for a pool volume of 36,000 litres, the calculated required heat pump power is 14 kW.

Practical Considerations (Based on this method)

This calculation provides a baseline figure for the required heat pump size in kilowatts. While this method is straightforward and presented in the reference, actual heat pump sizing can also be influenced by other factors such as:

  • Desired temperature increase
  • Ambient air temperature and climate zone
  • Whether the pool is covered (pool covers significantly reduce heat loss)
  • Wind exposure

However, using the volume and the conversion factor of 2500 as described in the reference gives you a primary estimate of the power needed.

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