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It will vary on the room type and construction. However you can assume you want 10-15 watts of energy per square ft. That would mean you want 2500-3750 watts total, which would be 8,500 - 12,750 BTU's (3.4 BTUs/Watt).


References:

How_many_square_feet_does_a_5000_BTU_heater_heat

http://www.diychatroom.com/f18/btus-watts-35066/

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