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10-20 W/m2 is modern warm house, 30-40 - modernish house or well insulated old house, 60 - barely insulated, 100 - no insulation. Roughly.

Assuming they mean kbtu/h continuous and not kbtu, 12kbtu/h is ~3.5kW. So, 7, 10, 14 KW units.




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