  BTU is short for British Thermal Unit. 1 BTU is the heat required to raise 1 lb of water by 1 degF. So it is a quantity of heat, which is equivalent to a quantity of ene â¦ rgy, in fact 1 BTu = 1.055 kilojoules, so 1 BTU/second = 1.055 kilowatts. This is called the mechanical equivalent of heat.nswer:    A BTU is the amount of heat energy required to raise 1 pound of  water by 1 degree Fahrenheit. So a 30,000 BTU burner can heat  30,000 pounds of water by 1 â¦ degree Fahrenheit.
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