You need 100W per square meter. 100W equals around 341.3BTU. 1 square meter are around 10.7 square feet. You therefore need around 32 BTU per square foot.
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how many square feet does a 14,000 btu heater heat
A 200,000 BTU wood burning stove will heat 1,000 square feet.
10.000
300
It is a question of cubic feet, not square feet.