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How many square feet does a 5000 BTU heater heat?

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There is a lot more to it than square footage. To find out the heat load on any room or home you need to have a load calculation performed. This is a process that takes into account location, construction features, etc.

With a portable heater (which is what you're talking about if it's 5,000 BTU), you can estimate heating ability with the 10 - 15 watt per square foot rule of thumb. So, 1,500 watts (5,120 BTU) will heat about 150 - 225 square feet. To go from watts to BTU, multiply watts by 3.4.

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First answer by Sdresh. Last edit by Sdresh. Contributor trust: 874 [recommend contributor]. Question popularity: 21 [recommend question]

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