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Old 09-11-2011, 12:05 AM   #1
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Furnace Venting Question


Hi:

I have a 95% Rheem furnace which has a 3" PVC exhaust vent running horizontally across the basement to the outside. The combustion air is from the basement. I have a natural draft gas water heater which is vented into my 12", single flue chimney with no stainless steel liner. My question is: Is there a code-compliant way to vent both the furnace and the water heater up the chimney?

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Old 09-11-2011, 03:11 AM   #2
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Furnace Venting Question


No they must be vented separately.

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Old 09-11-2011, 06:19 AM   #3
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Furnace Venting Question


And your water heater isn't allowed to be vented into a 12" chimney. The chimney needs to be lined for the water heater.
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Old 09-11-2011, 11:47 AM   #4
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OK, thanks. I'll scrap that idea.
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Old 09-14-2011, 10:47 PM   #5
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Can I vent the furnace and water heater through the same chimney flue if I install two 3" stainless steel liners, one for the furnace vent and the other for the water heater?

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Old 09-14-2011, 10:50 PM   #6
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Your furnace is not approved for stainless steel vent pipe. Or At least I've never seen a 90% plus efficient hot air furnace that was approve for it. Many boilers are though.
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Old 09-14-2011, 10:56 PM   #7
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OK, thanks again.

I've seen water heaters which have a PVC vent. If I replace the water heater with that type, would it then be permissible to vent the furnace PVC and water heater PVC in the same flue?
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Old 09-14-2011, 11:00 PM   #8
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They could both have their PVC pipes ran up through the same chimney.
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Old 09-14-2011, 11:04 PM   #9
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OK, Thanks a third time!

I will look into that approach.

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