A BTU is a unit of measure invented by Thomas Tredgold from England in the early 1800's. It stands for a "British Thermal Unit". He defined it as the energy it takes to increase 1 pound of water 1 degree Fahrenheit. For example he took 62F water and heated it to 63F.* The energy exerted to heat that scenario was one BTU.
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*This information was taken from an article called "Coming to terms with common hydronic TERMS" written by George Carey in the May 2012 edition of ICM.
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