From Gas Consumption to Heat Pump Capacity

Formula: Heat pump capacity (kW) = (Annual gas consumption in kWh) / (Full load hours of heat pump)

Tip: A heat pump typically runs 1500–2000 full load hours per year. More running hours means a smaller required capacity.

Gas Consumption Input

Heat Pump Operating Hours

(typical: 1500–2000)

Required heat pump capacity:

- kW

Explanation

This calculation uses the following formula:

Capacity (kW) = (Annual gas consumption in kWh) / (Full load hours)

The gas consumption (in kWh, m³, liters, or kg) is first converted to kWh. Then we divide by the number of hours the heat pump runs at full capacity to deliver the same amount of heat.

Example: 12,000 kWh/year gas / 1500 hours = 8 kW heat pump.

Fuel conversion factors

Fuel type kWh per unit
G20 (Natural gas) 9.77 kWh/m³
G25 (Low-calorific gas) 8.81 kWh/m³
LNG (by mass) 13.0 kWh/kg
LNG (by volume) 6.5 kWh/liter
LPG (by volume) 6.8 kWh/liter
LPG (by mass) 12.8 kWh/kg