To calculate the amount of BTUs needed to heat your room take the following steps:
 Step 1. Multiply length of room x width of room x ceiling height
Step 2. Multiply this figure by a factor of 5 if your room has a standard amount of windows and doors and has a standard amount of insulation.
or
Multiply this figure by a factor of 6 if your room has a greater than average amount of windows and doors and lower than average amount of insulation.
or
Multiply this figure by a factor of 7 if your room is north facing.
Example - Room dimensions
- 14' length x 16' width x 9' ceiling height = 2,016 cubic feet.
- For room with average insulation
- 2,016 x 5 = 10,075.
- Therefore 10,075 BTU is the minimum heat output required to heat this room.
NB: Solid fuel heat output figures in table are based on burning household coal.
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