Calculate annual electricity use, running cost and CO₂ of a heat pump from heat demand, flow temperature, SCOP and electricity tariff.
This calculator answers: how much electricity does the heat pump use each year, what does that energy cost, and what CO₂ emissions result?
Complete the inputs and calculate.
Combine useful heat demand, SCOP, flow temperature, tariff and CO₂ factor.
Useful heat demand, matching SCOP, flow temperature, direct backup share, electricity price and emissions factor.
SCOP is a seasonal average for a specific heat source and flow temperature. Higher flow temperature often lowers heat-pump efficiency; a SCOP from another temperature level is not comparable.
Heat-pump electricity = useful heat/SCOP; direct backup is added. Cost and CO₂ equal electricity times tariff or emissions factor.
12,000 kWh heat at SCOP 4 needs 3,000 kWh electricity; at €0.30/kWh that is €900 before backup heating.
Sources and limits: Use manufacturer SCOP under EN 14825 conditions; flow temperature must match the SCOP rating.
Combine useful heat demand, SCOP, flow temperature, tariff and CO₂ factor.
Energy calculators balance quantities over time and separate useful energy, losses and grid import. This matters because power is instantaneous while energy is its time integral.
Heat-pump electricity = useful heat/SCOP; direct backup is added. Cost and CO₂ equal electricity times tariff or emissions factor.
Useful heat demand, matching SCOP, flow temperature, direct backup share, electricity price and emissions factor. SCOP is a seasonal average for a specific heat source and flow temperature. Higher flow temperature often lowers heat-pump efficiency; a SCOP from another temperature level is not comparable.
Enter annual useful heat demand, the SCOP value matching your flow temperature, any direct-electric backup share, and electricity price and CO₂ emissions factor. The calculator returns the heat pump's electricity use, annual cost and CO₂ output.
12,000 kWh heat at SCOP 4 needs 3,000 kWh electricity; at €0.30/kWh that is €900 before backup heating.
SCOP is a seasonal average for a specific heat source and flow temperature. Higher flow temperature often lowers heat-pump efficiency; a SCOP from another temperature level is not comparable. An annual value describes a scenario, not a guarantee for every day. Efficiency, coincidence, temperature, driving profile and tariff assumptions can change practical results more than rounding.
Heat and electricity in kWh, price in €/kWh, CO₂ factor in g/kWh, result in € and kg CO₂.
Comparing expected annual cost of different heat pumps or flow temperatures, or estimating the CO₂ balance of a planned heat-pump system versus an existing heating type.
Use manufacturer SCOP under EN 14825 conditions; flow temperature must match the SCOP rating.
Common mistake: Don't use a SCOP tied to a different flow temperature than the one actually needed – many heat pumps lose noticeable efficiency at higher flow temperature, and too favorable a SCOP substantially underestimates electricity use and cost. Don't confuse heat demand with the heat pump's installed heating capacity; annual cost depends on the actual heat quantity needed, not the unit's rated power.
SCOP values apply only to the conditions under which they were measured; a higher actual flow temperature (e.g. radiators instead of underfloor heating) often noticeably lowers real efficiency below the stated SCOP.
COP describes efficiency at a single operating point, while SCOP is a seasonal average over a typical climate year per EN 14825, making it the more suitable metric for annual cost.
On very cold days the heat pump alone is often insufficient; the direct-electric backup operates at a COP of 1 and raises electricity use and cost disproportionately to its share of heat delivered.
Electricity is derived from useful building heat, SCOP and an optional direct electric backup share. Flow temperature documents the temperature level to which the SCOP applies.
Use a manufacturer SCOP for the matching heat source and flow-temperature range; this is a preliminary estimate, not an efficiency certificate.
Inputs, units and assumptions remain traceable in the result. Planning and approval require measured data, manufacturer documentation and a time-series simulation.