Verify the inputs
Measure or document each input. If a value is only an estimate, record its source and test a conservative alternative.
Heating/ CALCULATOR
Cost per useful heat delivered
Compare input energy and cost for a useful heating demand and seasonal performance factor.
FROM ESTIMATE TO ACTION
Use the result, not just the number.
Keep the calculation traceable
Save the input link or copied result together with the date, units and assumptions. A number without its inputs cannot be checked later.
Confirm the decision
Compare the estimate with the related guide, current product data and requirements that apply at your location before buying or building.
Inputs to verify
- Useful heat demand (kWh)
- Heat that must reach the conditioned space.
- Seasonal performance factor (ratio)
- COP for a heat pump, or delivered efficiency as a decimal for another system.
- Energy price (currency units/kWh)
- Price per kWh of purchased input energy.