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for the shop two 220vac 4800 kw construction heaters will do the trick. 4800kw = apx 16000 btu each. in my 26'x26' 10'wall (walls r20 attic r 40 ) shop i have 3 of these. 2 work and the third is a extra for the faster warm ups at -30 and colder. with the electric heat the chance of a explosion (gas fumes) is all but eliminated. i am getting to old for close calls.