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Can I use exisitng PVC vent piping if I change from power vent to a conventional water heater

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Natural gas water heater.  Current power vent system has pvc piping from top of water tank/blower to the ceiling of the basement and then out through the side of the house.  Approximately 5 feet in total.  How would I connet from top of converntial heater (I assume galvanized pipe) to pvc?
asked in Gas Water Heater by stanlej (120 points)
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1 Answer

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Hi Stanley,
 
Unfortunately you cannot use power vented water heater’s PVC vent pipe to discharge exhaust gases from a natural draft water heater. 
 
The problem is in the exhaust gasses temperature which would result in melting of the PVC vent pipe. Power vent creates a draft which significantly lowers the temperature of the exhaust gases.
 
Natural draft gas water heater requires properly installed galvanized steel B vent (double wall) or some other type of locally approved chimney system. You can find more details at the following post on my website - http://checkthishouse.com/49/water-heater-vent-pipe.html
answered by darekrudy (21,730 points)
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