/ BTU Calculator BTU Calculator The British Thermal Unit (BTU) is a standard measurement of heat energy. Knowing your required BTU to heat your space is an important part of choosing the right heater. RESULT You will need BTU/hour or watt. To shop all heaters, click here Room Size (Sq. Ft.) x Temperature to Increase (F°) Ceiling Height (Ft.) Insulation Condition No insulation / Outside Poor insulation / Loose leakage Average insulation / Average leakage Good insulation / Tight leakage
