Indirect heating via water seal
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Are there any companies that use indirect heating for their water seals? What method is being used? Heating tube winding? Still an electric heating tape? Are there any other methods?
I’ve never seen a water-seal heating system; there’s a picture of one from before
It seems there isn’t any more. What you’ve mentioned covers almost everything I’ve seen; there might be another type of jacketed heating, but its effectiveness is not as good as that of coiled tubes