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Old 08-03-2015, 12:42 PM   #1
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Default Tankless water heater vent material question.

Our shop has come across a weird issue. We have to change out a tankless heater, from a non condensing unit, to a condensing unit. I would think we could use the higher quality metal non condensing vent for the condensing unit as well, but unsure. Have any-of you come across this?
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Old 08-03-2015, 07:23 PM   #2
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What's the manufactures instructions list for materials? Whatever it is ( more than likely plastic) you follow the instructions.
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Old 08-04-2015, 02:35 AM   #3
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PVC.. Should say in the installation manual.
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Old 08-04-2015, 05:29 PM   #4
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Just a mention the PVC pipe manufactures do not allow it to be used as a flue. So if it fails it's on you and the manufacturer.
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Old 08-04-2015, 05:55 PM   #5
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Quote:
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Just a mention the PVC pipe manufactures do not allow it to be used as a flue. So if it fails it's on you and the manufacturer.
One manufacturer does. I think it was IPC? You know that screened 90 that comes with power vented water heaters? They make it and they say it can be used for flues.
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Old 08-05-2015, 11:49 AM   #6
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Some local code enforment officials will not allow me to use pvc. Does not matter what man specs say. Most of the time CPVC is allowed or in one jurisdiction we have to use a duravent material. This seems to be a highly controversial topic on here.
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Old 08-05-2015, 12:03 PM   #7
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Default Tankless water heater vent material question.

Quote:
Originally Posted by paultheplumber1 View Post
Some local code enforment officials will not allow me to use pvc. Does not matter what man specs say. Most of the time CPVC is allowed or in one jurisdiction we have to use a duravent material. This seems to be a highly controversial topic on here.

Unless the city, town or state puts in a ordinance or modification to their adopted gas code , you follow the manufactures instructions. Just because a inspector has an opinion he can't just make up a code. Tell him to show you where to find this code. I think your in RI and I know it's a topic out there and I've asked a plumber where it is written he doesn't know just that's what the inspector wants.
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Old 08-05-2015, 07:29 PM   #8
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Quote:
Originally Posted by plumbdrum

Unless the city, town or state puts in a ordinance or modification to their adopted gas code , you follow the manufactures instructions. Just because a inspector has an opinion he can't just make up a code. Tell him to show you where to find this code. I think your in RI and I know it's a topic out there and I've asked a plumber where it is written he doesn't know just that's what the inspector wants.
Thank you, sir, for posting this!!!!! So many plumbers quake when the mere name of an inspector is mentioned. I have always been of the mindset that the inspector is an enforcer of existing code. They do not have the autonomy to implement their own, without some documented proof from the local jurisdiction. It is very reassuring, to me personally, to hear one of "you" guys acknowledge what their responsibility is. Thanks again, sir.
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Old 08-05-2015, 07:36 PM   #9
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Quote:
Originally Posted by mccmech View Post
Thank you, sir, for posting this!!!!! So many plumbers quake when the mere name of an inspector is mentioned. I have always been of the mindset that the inspector is an enforcer of existing code. They do not have the autonomy to implement their own, without some documented proof from the local jurisdiction. It is very reassuring, to me personally, to hear one of "you" guys acknowledge what their responsibility is. Thanks again, sir.


Why thank you, I always stay between the covers of my code
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Old 08-05-2015, 08:27 PM   #10
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Up here is system 636 PVC, or metal direct vent.
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