Originally Posted By: kmcmahon
This post was automatically imported from our archived forum.


Anyone ever seen this substance build up in the burner area?
Just trying to figure out what it is.
A.O. Smith says it may be something coming back down the flue, which made sense since the flue had no vent cap on the chimney. Could this be from rainwater?
Sorry, the first pic is upsidedown.
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