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  • rmaangus commented on amalkhan's instructable How to Distill Water10 months ago
    How to Distill Water

    The calculations for energy useage are as follows:Heat of vaporization of water is 970 BTU/pound. To raise the water from 42 degrees to 212 will require an additional 170 BTU. 1140 BTUs is equal to 0.33 KWh, so to boil a gallon of water (i.e. about 10 pounds) requires about 3.3 KWh.This is assuming 100% efficiency. The device described would probably be only about 10% efficient, but a properly designed still would probably be about 80% efficient. (Start with an immersion heater in an insulated container, and use air or a water filled heat sink for condensing).

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