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Old 02-19-2020, 03:44 AM   #16
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Re: Retrofit Direct-Vent Water Heater to Powered Venting


Your water heater is a high temp vented appliance. It would melt the PVC.
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Old 02-19-2020, 06:34 AM   #17
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Re: Retrofit Direct-Vent Water Heater to Powered Venting


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Your water heater is a high temp vented appliance. It would melt the PVC.
Yes, I'm sorry, I meant if I replaced my whole unit with a power vented water heater (not just retrofit), I thought it would be able to use/share the common PVC vent from my furnace. It seems like there are mixed opinions of this online so I'm not sure I understand.

Power vented water heaters are able to use PVC, correct? Because the speed of venting cools the gases down enough to be safe with that material. Natural draft can't because the gases are slow moving and too hot. But some resources say power vents can share the furnace PVC vents, while others caution against it. Anything I'm not understanding correctly?
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Old 02-19-2020, 09:18 AM   #18
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Re: Retrofit Direct-Vent Water Heater to Powered Venting


You cannot share PVC venting with your furnace. It is forbidden.
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Old 02-19-2020, 04:08 PM   #19
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Re: Retrofit Direct-Vent Water Heater to Powered Venting


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Originally Posted by Stephen N View Post
Yes, I'm sorry, I meant if I replaced my whole unit with a power vented water heater (not just retrofit), I thought it would be able to use/share the common PVC vent from my furnace. It seems like there are mixed opinions of this online so I'm not sure I understand.

Power vented water heaters are able to use PVC, correct? Because the speed of venting cools the gases down enough to be safe with that material. Natural draft can't because the gases are slow moving and too hot. But some resources say power vents can share the furnace PVC vents, while others caution against it. Anything I'm not understanding correctly?



If you were to tie the two exhaust together. When the water heater was running, the furnace would go into lock out because its pressure switch would be closed before the inducer started.


Same for the water heater if the furnace was running when the water tried to start to heat the water.
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Old 02-19-2020, 04:11 PM   #20
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Re: Retrofit Direct-Vent Water Heater to Powered Venting


Thanks gang, appreciate the help and added understanding! I feel better moving into making some decisions, while steering clear of the common vent, etc
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