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about 12,000
to calulate your btu needs,you can use this link: http://hearth.com/calc/btucalc.html
check out www.energyefficientnation.org. has the answer to tons of questions like this.
80,000 btus (british thermal units) should heat up 3,500 square feet
Standard practice holds that it takes 5000 BTUs to heat a room 100 to 150 sq ft Figure on adding another 1000 BTUs for every 50 or so sq ft added. Hence , 400 to 450 sq ft would need about 10,000 BTUs