I just moved into a new home. It has a natural gas supplied ventless 30,000 BTU wall heater. It is in the basement which is unfinished, but does have a 4'x8 piece of sheetrock behind it. The black pipe supply line runs 6" parallel to the side of the unit up and to the ceiling, which is exposed i-joist. It then T's and travels away from the wall and across the bottom of the i-joist to supply the furnace which is about 12' away. Here is the problem...the supply pipe is more or less directly above the heater (about 54" above the heater), and the pipe gets so hot when the heater runs that it burns my hand to touch it. I noticed it immediately the first time I ran it, and I have not run it since. Is this a code or safety hazard? Can this pipe burst or explode if it gets too hot? There is only one plumbing contractor in my town, and he is the one that installed it. I have had to have a few of his errors corrected already, so I don't think he'd be honest if I asked him. Any advice?
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