Heat pump vs gas boiler
Estimate annual space-heating demand from floor area and insulation class, then compare heat-pump electricity cost (by SCOP) against a gas boiler.
Open calculatorDomestic hot water
Thermal energy is litres per day × days × 0.001163 kWh/(L·K) × temperature rise from cold inlet to tap. Electricity consumption is that thermal energy divided by your heater’s COP (1.0 for an electric immersion heater, 2.0–3.5 for a heat-pump water cylinder). Standing tank losses and circulation loops are not included.
L
Cold mains water temperature entering the heater — typically 8–12 °C.
°C
Hot water temperature at the cylinder or tap — typically 45–55 °C.
°C
Heat delivered divided by electricity consumed — enter 1 for standard electric resistance or 2–3.5 for a heat-pump cylinder.
Running cost
669 zł
Thermal energy required
2,229 kWh
Electricity consumed
743 kWh
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0.001163 kWh/(L·K) is the specific heat capacity of water. Heating 150 L/day by 35 K requires roughly 6.1 kWh of thermal energy per day before tank losses.
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