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Hot water heater venting after disconnecting furnace from chimney

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From Luis Gonzales:

I have a old furnace, which is vented up the chimmey with the hot water heater,
( which is not forced vented). I’m going to replace the furnace with a high eff. which is vented out the side of the house. I’m concern that i will have a CO build up during cold weather. from the water heater. Will the water heater vent still work during cold winter days by itself


asked in Gas Water Heater by darekrudy (21,730 points)
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1 Answer

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Hi Louis,
That has been covered already in my posts. The following quote is from one of them (check full article here:  furnace and water heater venting)

#5. If one appliance has been disconnected from the chimney previously serving 2 or more appliances, make sure that a professional re-evaluates your chimney flue. It may need to be down-sized to prevent flue gas condensation and to provide proper draft (typical condition when upgrading to a high efficiency furnace)

And follow to this article: chimney flue sizing for calculations.

Let me know if you need further assistance, just click “ask related question” or “comment” below my answer

answered by darekrudy (21,730 points)