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Pool heat pump electricity use: calculation with COP

Heating output, electrical input and kWh are different quantities. A realistic estimate uses operating conditions, cover use and the applicable tariff.

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Ali SAVAŞ

Çilek Havuz

2 min read

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Heating output, electrical input and kWh are different quantities. A realistic estimate uses operating conditions, cover use and the applicable tariff.

Heating output in kW is heat delivered to the water. Electrical input in kW is power drawn from the supply. Energy consumption in kWh includes how long the equipment operates. These values are not interchangeable.

COP relates heating output to input at a stated operating point. It changes with conditions and load, so the highest published COP is not a full-season average.

At an illustrative operating point of 10 kW heating output and COP 5, electrical input is approximately 2 kW. Four hours at exactly that operating point would consume about 8 kWh. Multiply measured energy by the applicable tariff for the relevant energy cost.

This example does not mean the pool warms up in four hours or uses 8 kWh every day. Initial heating and maintaining temperature are different loads. Air temperature, wind, surface area, target temperature and cover schedule change the result.

Filtration and auxiliary equipment can add consumption beyond the heat pump itself. State whether they are included rather than equating the heater calculation with the entire electricity bill.

For an inverter unit, one instantaneous reading is not a monthly total. Compare recorded kWh under similar weather and use. Prepare location, dimensions, swimming months, cover use and your current tariff before requesting an assessment.

Quantities used in the calculation
QuantityExampleLimit
Heating output10 kWOnly at the stated operating point
COP5Not a fixed seasonal average.
Electrical input10 ÷ 5 = 2 kWCalculated under the same test condition.
Energy over four hours2 × 4 = 8 kWhAssumes the input stays unchanged for four hours.
CostkWh × the applicable tariffOther consumption and tariff structure are assessed separately.

A useful assessment starts from the pool dimensions, location and existing equipment. Where the question depends on them, recent water test results, the product label or the exact device model are also needed.

With these details, the Çilek Havuz team assesses the appropriate product, maintenance or technical work. A specific recommendation is only reliable when it matches the installation and its documented operating conditions.

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References

  1. 1.Energy efficiency in water and pool heatingU.S. Department of Energy

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