This simple system uses a thermopile to generate all the power that is needed to operate the gas valve. The thermopile puts out millivolts. This type gas valve is used for floor furnaces,deep fryers, roofing equipment, etc. A fuse is tied into the jumper wire to safety magnet to kill the equipment should the thermostat for some reason not shut down at the desired temp.
typical thermopile
generator
This thermophile/pilot assembly when lit powers the valve. All that is needed to regulate the heat is a cheap wall thermostat
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