Quote:
Originally Posted by gtojohn
in imperial terms is takes 1 btu to raise 1 pound (pint) of water1 degree. resistance heat like electric hot water produces 4.13 btu per watt. not very efficient in terms heat per watt. if you are producing your heat with a heat pump you might expect to produce 12 btu or higher per watt of electricity input.
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Nope, the few previous posts state the correct conversion rate of 3.412 btu per watt. However, many gas heated units are Inefficient enough that they run at or above this rate. But electrical heated units generally stay below 3 1/2.
The 4.13 value is very close to the conversion rate of btu to kilocalories. Kind of like rounding the value of pi off to 3.14.