View single post by GSlahor
 Posted: Tue Oct 20th, 2009 01:07 pm
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GSlahor



Joined: Tue Oct 20th, 2009
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 I'm new to the forum, so please forgive if the question has been asked before.

My gas hot water heater flue piping is constantly rusting. New piping lasts no more than 3 years before it's rusted completely through.  I don't think it's normal ( OR IS IT ?)

House was built new in 1997. Vent piping is 4" galvanized. Hot water heater flue is approx 6' long and is routed uphill and over to combine with gas furnace flue (8" double wall pipe), which runs vertical to roof. It's open (not blocked) all the way to the roof, and has a good natural draft.

I'm on my 2nd hot water heater (both professionally installed), and both units experienced the same accellerated flue vent pipe rusting, so I assume it's not a problem with the heater or it's burner, but rather something corrosive in the flue gas(?)

Any help would be appreciated. The corrosion is spreading to the main flue pipe running up through the house, which could get dangerous if it rusts through (as well as expensive to replace)

Gary