I have had my water heater (LP gas) soot up twice. The first time, a bat was spread eagled across the flue at the top of the heater. This time, no bat or any other blockage. I did a thorough cleaning including removing the spiral flue liner and cleaning the flue (in the heater) and the burner etc. The flame is a beautiful blue with a small yellow tip (as the manual says it should be) Any one have an idea on what could have caused the sooting? Oh yes, I did the "smoke test" after cleaning to test for proper draft. TIA, Jim
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LP water heater sooting up