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Old 04-01-2012, 02:10 AM   #1
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Nervous about welding drain pipe for water heater t/p valve?


Every time I install a water heater I worry about welding the drain pipe attached to the pt valve. I'm thinking the acid smoke from the heated flux will rise up inside the tube and damage the rubber gasket of the p/t valve. Is my concern groundless?

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Old 04-01-2012, 06:08 AM   #2
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Nervous about welding drain pipe for water heater t/p valve?


I assume you mean soldering not welding. Your concerns are groundless.

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Old 04-01-2012, 07:05 AM   #3
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Nervous about welding drain pipe for water heater t/p valve?


Just buy the pre made one's from HD or Ls. No soldering needed.
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Old 04-02-2012, 12:10 AM   #4
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Nervous about welding drain pipe for water heater t/p valve?


Yes, I mean soldering. I won't worry about it, it looks from the drain pipes I've seen that everyone does it.
Many of the drain pipes have to run a convoluted path to get from the p/t valve to the outside where they are supposed to go. I can't think of a cost effective way to run them except by soldering.
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Old 04-02-2012, 12:23 AM   #5
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Nervous about welding drain pipe for water heater t/p valve?


Quote:
Originally Posted by darsunt View Post
Yes, I mean soldering. I won't worry about it, it looks from the drain pipes I've seen that everyone does it.
Many of the drain pipes have to run a convoluted path to get from the p/t valve to the outside where they are supposed to go. I can't think of a cost effective way to run them except by soldering.

Coldiron gave you a cost effective way. Buy the plastic thin walled PVC pipe from HD (~$6 for a 54" piece). Put some teflon tape, screw in and voila, done.

By the by, the pipe should never be hard piped all the way outside. Pipe down to around 1" or 2" above the rim of the floor pan. That way owner is more likely to notice if there's water coming out of the T&P.
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Old 04-02-2012, 12:29 AM   #6
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Nervous about welding drain pipe for water heater t/p valve?


I agree it seems logical to run it outside, and I've even done it that way my self but it will not meet code to do it that way.
Anytime your soldering any valve it needs to be opened.
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Old 04-03-2012, 05:27 PM   #7
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Nervous about welding drain pipe for water heater t/p valve?


I think code around here (southern California) requires venting the drain of a w/h outside. Otherwise no one would go to the trouble of doing it.
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Old 04-03-2012, 09:37 PM   #8
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Nervous about welding drain pipe for water heater t/p valve?


Just goes to show how codes vary.
I cannot use PVC for a t&p line and it must pipe directly outside or to an approved drain such as FD, Sink, hub drain, etc. (not to the pan)
Pans are required in most applications and must follow the same discharge rules as the t&p.
A lot of homes here have basements and the t&p's are not piped out. In this case we can usually "grandfather" the install of the replacement heater.

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