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How Many Watts to Heat 1 Gallon of Water

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165 x 2 x 45 14850 Watts. Et 4186 2257 26756kJ. How Many Kilowatts Needed To Heat Water Heres a formula to figure out how many watts your heat pump uses. . From above heating a gallon of water by 1F takes 833 BTU. Heating from 68F to 104F would by a 36F rise or 36 x 833 300 BTU to heat 1 gallon of water. 100 x 4 x 30 3412 352. 4186 is the constant for the heat capacity of water and means that it takes 4186 joules of energy to increase the temperature of 1 kilogram of water by 1 degree Celsius. E2 mCvap 1 x 2257 2257kJ. Change requires 58359 BTU. So a heat pump with a CoP of 3 would need around 4000 kW of power per year to achieve this. Meaning that the water would be heated in 1 hour by 35kW of applied heat. As such if the water heater requires 100000 BTUs to heat the water you can say its power requirement is one 1 therm. 4 divide that by your heating power in watts and the result is the ...
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