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Pool Heating Energy Calculator

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Estimate ideal thermal energy and heating time before environmental losses.

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Enter your values and select calculate.

On this page How it works & practical examples

How to use the Pool Heating Energy Calculator

The power input is electrical consumption. COP converts it into delivered heat; a heat pump can have a COP above one under suitable conditions. Use a justified average COP for the scenario.

The calculation

Thermal kWh = volume × 1,000 × 4.1868 × temperature rise / 3,600; hours = thermal kWh/(input kW × COP)

Worked example

20 m³ warmed by 5°C needs about 116.3 kWh of thermal energy. A 5 kW electrical heater at COP 1 takes 23.26 ideal hours without losses.

Assumptions and limits

Assumes water density 1,000 kg/m³ and constant heat capacity. Heat loss, evaporation, circulation and temperature-dependent efficiency are omitted, so real heating can take longer.

Common questions

Is heater thermal output the same as electrical input?

Only at COP 1 in this model. If using thermal output directly, set COP to one and label the assumption accordingly.

Does this set a safe pool temperature?

No. Start and target temperatures are inputs, not recommendations.