This is a very simple calculation you can do, to work out the size of stove you need for the area you wish to heat.
Step1 – Measure the area you wish to heat i.e. your lounge. Measure in metres the width, length and height.
Step 2 – Calculate the measurements together (W X L X H) this is will give you the room volume in cubic metres. (If the room is L shaped measure in sections then add together, if the room has a pitched ceiling then use the height of the room as half the height of the pitch).
Step 3 - As a guide, 1kW heating output will approximately heat 25 cubic metres of space, if the room is well insulated, 15 cubic metres if the room is of average insulation, and 10 cubic metres if the room is poorly insulated.
So divide the area of the room (cubic metres) by the insulation figures above (25, 15 or 10 cubic metres) to get the heat out put required in KW.
EXAMPLE
A room measures 8 metres long x 4 metres wide and is 2.2 metres high
8 x 4 x 2.2 = 70.4 cubic metres
There fore a average insulated room would require an appliance with a heat out put of 70.4 divided by 15 = 4.69kw
Therefore you can see that the only item you have to make an assessment on is how well insulated the room is. Things that affect the insulation are: Large window areas; number of outside walls; open staircases in the room; number of doors; un-insulated walls etc
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