HTHOMETALLYTHE PRACTICAL HOME GUIDE

Heating/ CALCULATOR

Heat-pump daily electricity

Convert useful heat from the heat pump and auxiliary heater into an ideal daily electricity estimate.

Thermal energy delivered by the heat pump during the day.
Use performance for the relevant temperatures and operating conditions.
Useful backup heat, assumed one kWh electric per kWh heat.
Ideal electricity use

17.00 kWh/day

Average electrical demand

0.71 kW

Average COP applies to the stated heat-pump contribution and auxiliary heat is electric resistance at COP 1. Standby, pumps, defrost detail and distribution loss are excluded.

FROM ESTIMATE TO ACTION

Use the result, not just the number.

01

Verify the inputs

Measure or document each input. If a value is only an estimate, record its source and test a conservative alternative.

02

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.

03

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 from heat pump (kWh/day)
Thermal energy delivered by the heat pump during the day.
Average COP for the period (ratio)
Use performance for the relevant temperatures and operating conditions.
Useful electric-resistance heat (kWh/day)
Useful backup heat, assumed one kWh electric per kWh heat.

Continue your calculation

Heating

Heat-pump design-load coverage

Compare building heat loss with heat-pump and auxiliary capacity at the same outdoor design condition.

Heating

Cost per useful heat delivered

Compare input energy and cost for a useful heating demand and seasonal performance factor.