The serviceman, Cliff, who performed the warranty flush and inspection saved our lives by noticing that our flue, shared by our furnace and hot water heater, had a crack in it. We so appreciate him bring this to our attention!
However, the initial installation of the water heater flue last year was not performed correctly. It was tape, upon tape and we paid today to have that corrected and replaced, along with the replacement of the furnace flue.
Again, our deepest gratitude to Cliff for noticing and reporting the crack. It was, as he put it, a "gnarly crack." Thank you. Dana and Doug Bortz