Heating power estimate
Type the floor area, the ceiling height and the insulation level: you get a rough idea of the heating power needed on a very cold day.
Result
7.8 kWHeating power (order of magnitude)
- In watts
- 7,800 W
- Per m²
- 78 W/m²
- Heated volume
- 250 m³
- G coefficient used
- 1.2 W/(m³·K)
- Temperature difference
- 26 °C
Inputs
- Heated floor area
- 100
- Ceiling height
- 2.5
- Home insulation
- Average (older insulation)
- Wanted indoor temperature
- 19
- Outdoor temperature on a very cold day
- -7
How it is calculated
Volume = floor area × ceiling height.
Result
Heating power (order of magnitude)
- In watts
- 7,800 W
- Per m²
- 78 W/m²
- Heated volume
- 250 m³
How it is calculated
- Volume = floor area × ceiling height.
- Power = volume × G × (indoor temperature − outdoor temperature).
- G comes from the insulation level: 0.6 (very good), 0.8, 1.2, 1.6, 2 (none), in W/(m³·°C).
Example
100 m² with 2.5 m ceilings, average insulation (G = 1.2), 19 °C inside and −7 °C outside: 250 × 1.2 × 26 = 7,800 W, about 7.8 kW.
Good to know
- This is only an order of magnitude, not a sizing study.
- Windows, ventilation, orientation and thermal bridges are not taken into account.
- Before buying a boiler or heat pump, ask a professional for a heat loss study.
Frequently asked questions
What is this tool used for?
Type the floor area, the ceiling height and the insulation level: you get a rough idea of the heating power needed on a very cold day.
How is the result calculated?
Volume = floor area × ceiling height.
What should I check before using the result?
This is only an order of magnitude, not a sizing study.