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

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 ...