Keeping your food cold

At a duty cycle of 30%, this amounts to a steady 750 Btu pumped away as waste each hour or, in a 24-hour period, some 18,000 Btu. If the water in the tank housing the HDC is initially at 60 degrees F, we'd need 480 Btu for each gallon of water raised to the temperature of 120 degrees F. Assuming only 50% efficiency, we'd get 15-20 gallons of ... ................
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