Hello, I installed a new Rheem 50 gallon natural gas water heater to replace my old Rheem 50 gallon. I noticed after it ran for probably a half-hour the plastic trim pieces around the water lines was melting. The vent is very simple just an elbow on about a 45 then straight out the block wall, has plenty of slope. I can't see what would be wrong. Any info would be greatly appreciated.
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