BTU - British Thermal Unit

This is the amount of heat required to increase the temperature of one pound of water by one degree Fahrenheit (F). Most heating appliances are rated in BTUs: furnaces, stoves and even the burners on your cooktop. But just BTUs is not the whole story. For example, a low efficiency heating appliance can produce lots of BTUs but not be adequate for the needs of the space to be heated. A space with very even heat can feel more much comfortable at a lower temperature then one with a high BTU heater on one side and cold surfaces on the other.

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