Step 1

Calculate your room’s volume (m3). Measure your room width, length and height. Multiply those figures with each other to get your room volume.

Length (m): Width (m): Height (m):

Step 2

Multiply the cubic metres (volume) by the relevant insulation factor below:

Insulation Level: Poor Good Calculate kW Output

* The result, measured in kilowatts, is the minimum heat output required.