How do I calculate how big an output stove I need?

This simple calculation will give you a good indication of which size stove would be suitable. Measure your room, in metres: 

Width x Length x Height = A

Divide ‘A’ by 14

For example -

4m x 5m x 2.4m = 48

48 ÷ 14 = 3.42

This room requires 3.42kw of heat to keep the temperature in the room at approx 20˚C when the outside temperature is at approx 1˚C. In real terms, this means you should be looking for a stove with a maximum output of 4-5kw. A stove of this size will produce the extra heat when you need it, but its normal steady rolling (and efficient) burn will be producing an output of approx 3-4kw – just what you need.

Of course, these figures are only an indication - you also need to take into account factors like cold draughts, north facing walls, bad insulation......and if you have 2 or 3 internal doorways which can be left open, or stairs in the room, you may wish to choose a larger stove so that you heat other parts of the house. We are happy to talk through all options in more detail.