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Brown PVC water heater flue


Jerry Simon
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Got the manuals? I found American's install instructions pretty quickly online, fourth hit when I searched 'power vented water heater'. They call for 3" pipe with long sweep fittings (pdf page 9), I see 2" pipe and standard fittings. That would build up some extra heat.

http://www.americanwaterheater.com/supp ... ervent.pdf

Tom

That sounds good, Tom. I actually mistaked the water heater flues for furnace flues 'cause of their size ('till I went in the house). I'll bet you're right.

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Ok, I'll venture another WAG. My water heater has a faulty low limit switch so the tank temp gets very close to ambient, then it fires and runs balls out to raise the temp and over shoots the high limit. A differential between the low limits from one tank to another will create a differential in run times, and a fault like mine would explain the cooked exhaust. With parallel tanks no one would notice the temp variations that I have, which led to my conclusion.

Tom

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