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I have a natral gas fernice, what would it take to convert it to run on biogas, and how big of a dijester would I need to heat a 1000 square home.
The calculations for the amaount of gas from food are available on the solar cities website, and i guess elsewhere. I've done some. and at optimum Temperature, with the right microbes, and food, an IBC could produce 6 to 11 kWh of heat. this is not enough to heat a house, but will bang a hole in your hot water heating. I worked out you could have two bursts of about 2 kW for about 3 hours per burst. It all depends on your digester temperature control and your gas storage volume.
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