Quote:
Originally Posted by rexxfan
Interesting thought but beyond my capabilities to test. My duct theory seems possible, but I'll admit, a bit unlikely. It seems there ought to be a simpler explanation, but I just can't come up with one. As an aside, how are gas hot water heaters supposed to be vented, anyway? Is it even possible that it what the duct is for?
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bc
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Electric HW heaters are not vented. Natural Gas HW heaters are generally vented by a rigid vent pipe through the roof. It depends on the layout of your house, but as a rule, this is the norm. Tankless HW heaters require a larger diameter vent than standard tanks.