BTU per Hour Conversions
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A British thermal unit is the amount of energy required to heat a pound of water by 1 degree Fahrenheit. This can vary slightly depending on the temperature of the water, therefore different estimates for the BTU exist.
A BTU/hour is about 2.93 watts.
Mechanical horsepower is commonly used to measure the maximum power of a car's engine in the United States or the UK. It is approximately equal to 746 watts.