I'm not real sure what the name of the area is that I am trying to describe, so will try my best.
When the hot water heater is heating, the flame is blowing out of a pipe about 1/2" in diameter, into a pipe about 2" in diameter.
At the end of the 1/2" pipe, there seems to be some buildup that glows like a cigar ash.
Is this "cigar ash" supposed to be there?
Let me know if what I am attempting to ask is making any sense or if there are any clues I can give to try to make sense