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I currently have a natural vent gas furnace and water heater, both venting through a b-vent.

If I replace the furnace with a high-efficiency model that vents through the wall, do I also need to replace the water heater with a power vent model?

Or can the water heater continue to vent through the b-vent?

One contractor says no problem, the other did not mention the natural vent as an option.

Price would be 600 more for a power vent Bradford-White heater compared to natural vent.

Thanks.
 

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No you don't have to replace the water heater all you need to do is cap off the pipe the the heater was vented to or remove the Y and replace it with a single vent opening sized for the water heater flue pipe.
 
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