Fireplace Calculator

You should never choose a stove solely for it looks and design – there are many other considerations that you need to take into account. It is important that the stove’s output capacity matches your actual heating needs.

All closed combustion fireplaces carry a KiloWatt (kW) rating and we calculate how much area can be heated by applying a common formula used throughout the fireplace industry.

As an approximation, 1 kilowatt will heat 30 cubic meters.

However, a number of factors need to be considered to determine how to adjust this basic formula. Where this becomes tricky is that this calculation is very subjective to variables such as

  • the insulation of the room and house
  • the number of windows
  • the average outside temperature.
  • the number of inter-leading rooms.
  • the type of fuel used and type of fireplace (pellet and gas fires give a more consistent heat output)

The desired room temperature should also be considered as well. What can we say, some people like it hot!

Improve the effectiveness of your fireplace

There are many ways you can get the most out of the heat provided by your fireplace.

  • The kW output of your fireplace and the heat distribution can always be complemented with a ceiling fan to circulate the hot air down and stop the thermal cap that develops especially in vaulted ceilings
  • you could purchase one of our Stovepro heat powered stove top fans.
  • Keep the flue pipes in the room (as opposed to flueing to the outside) as this will give you approximately 1kW of additional heat for every 1.2m of flue (based on 150mm diameter pipe).
  • Always burn dry (less than 20% moisture) seasoned wood

We recommend

Stove output ratings are sometimes provided as nominal (average) or maximum or a range. While you stove may provide 10kW output at a maximum it is not a good idea to burn it at maximum for long periods. We think of it like this: Just because your car can go 180km/hour you don’t drive at that speed constantly. We recommend that you buy slightly bigger kilowatt output than required. You can always burn less wood, damp down your fire or open a window but when it is freezing and you can’t make a low output stove burn any hotter than its maximum output.