Wattage and British Thermal Units (Btu) indicate how large of a space a heater can effectively warm up. Watts indicate the energy transfer rate, while Btu indicate the amount of energy used. 1 watt is ...

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Large rooms (300 square feet or more) are uniquely challenging to keep warm in the winter. Further, high ceilings, hard-to-reach corners and drafts greatly factor into which heating method is most ...