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Does anyone know why this water heater carbonized?
Water heater carbonized. The only info I have is that the water heater was off for a few years. I checked the draft, which was drafting well and there was nothing in the area inside by the flu baffles (birds nest etc.) I lit it up 6 weeks ago and it was fine till 2 days ago when the customer called me. 1) does is pay to clean out? 2) would the same thing happen if I put a brand new unit in? (in my 13 years of doing this, I have never seen one carbonize)