When to use this calculator
Estimate heat-pump electricity from delivered heat and an assumed COP. A constant COP scenario; seasonal conditions, defrost and auxiliary loads can change actual consumption.
Explore the electricity use & bills calculators for other questions in this topic. For a related calculation, use the Heating Energy Calculator: Estimate ideal energy required to raise water temperature.
PUTTING IT INTO PRACTICE
Heat Pump Electricity: a worked example
The values below are an illustrative example, not a recommendation. Replace them with measurements or assumptions that match your question.
| Input | Example value |
|---|---|
| Useful heat demand (kWh) | 100 |
| Assumed heating COP | 4 |
| Result | 25 kWh |
- Check the input labels and enter the example values above.
- Apply the relationship: Electricity = delivered heat/COP.
- The result is 25 kWh, rounded for display.
How to interpret your result
A constant COP scenario; seasonal conditions, defrost and auxiliary loads can change actual consumption.
Watts describe power and kilowatt-hours describe energy. Fixed charges do not vary directly with consumption. Devices with thermostats or cycling loads need measured average energy or realistic operating time.
Frequently asked questions
Can I multiply rated watts by 24 hours for every appliance?
Only if it actually draws that power continuously. Cycling and variable-power appliances require a better average-use estimate.
When is the heat pump electricity calculator useful?
Estimate heat-pump electricity from delivered heat and an assumed COP. A constant COP scenario; seasonal conditions, defrost and auxiliary loads can change actual consumption.
How do I use the heat pump electricity calculator?
Enter useful heat demand (kwh), assumed heating cop. The result updates automatically. Use the units shown beside each input; the example values illustrate the method.
Which formula does this calculator use?
Electricity = delivered heat/COP.
What should I check before using the result?
A constant COP scenario; seasonal conditions, defrost and auxiliary loads can change actual consumption.
How are results rounded?
Scalar numbers display up to six decimal places, with scientific notation for very large or small values. Text, fraction, date and schedule outputs use the format described on the tool. Intermediate calculations use JavaScript floating-point arithmetic. Keep sensible precision for your measurements.
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