Q:

What size room is a large room space heater designed to heat?

A:

Quick Answer

Standard space heaters with 5,100 Btus of output are able to heat a standard-size room of 144 square feet. Larger space heaters heat larger rooms. To calculate the power needs of a living space, a safe estimate is that each square foot of space requires an additional 10 watts.

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Full Answer

Rooms may need more than 10 watts of power per square foot if the room has a lot of windows, is poorly insulated, or has a tile or cement floor, high ceilings or a staircase. Rooms with few windows, those that have low ceilings, are well insulated or that are used several people at a time may require fewer Btus than other rooms.

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