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I use one of these seedling heat mats as my heat source inside a freezer. They're built to have stuff sitting on top of them, they're water resistant, and they heat gently. Seems pretty safe to me. That said, you can make any of these options much safer by plugging your temperature controller into a GFCI outlet.


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Depending on the type of temperature probe, you could use 2 of them in parallel, one in the middle of the wort and one taped to the side of the vessel to get a rough "average" of the reading of the two probes. Use the same probe type, wire, and wire length to help eliminate any difference in resistance that would affect the reading. Mathematically it won't ...


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The temperature will vary, but as fermentation proceeds we will be generating CO2 which aids convection within the fermenter. As such you should not see a large difference, but if you see any then measure 1/2 way.



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