What is BTU? BTU is short for British Thermal Unit. It is defined as how much heat it takes to raise one pound of liquid water by one degree Farehnheit. How much is a BTU? A single BTU is very small. So small, in fact, that you could only notice the heat if you were directly near its source. The United States Department of Energy states the following: A single Btu is very small in terms of the amount of energy a single household or an entire country uses. In 2020, the United States used about 92.94 quadrillion Btu of […]