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-   -   Can I use an MPT fitting on this hot water outlet? (http://www.diychatroom.com/f7/can-i-use-mpt-fitting-hot-water-outlet-187507/)

noone 09-23-2013 05:05 PM

Can I use an MPT fitting on this hot water outlet?
 
2 Attachment(s)
I'm confused. I'm not sure if I should use an MPT fitting on this hot water outlet on a Rheem Marathon water heater. If i'm not supposed to use the MPT fitting, what should I use? The water heater manual says explicitly not to use any pipe sealant on the hot water side.

First pic is fitting. Second pic is hot water outlet on water heater.

TheEplumber 09-23-2013 05:29 PM

The seal appears to be made at the rubber washer in the tank outlet- therefore no sealant needed

Ghostmaker 09-23-2013 05:49 PM

You need to use a dialectic adapter first. Your tank should have 2 stainless steel nipples that would fit the bill. Never screw copper into a galvanized tank the joint is eaten out by electrolysis.

TheEplumber 09-23-2013 06:00 PM

Quote:

Originally Posted by Ghostmaker (Post 1245615)
You need to use a dialectic adapter first. Your tank should have 2 stainless steel nipples that would fit the bill. Never screw copper into a galvanized tank the joint is eaten out by electrolysis.

He's using a Marathon heater. They are plastic tanks with brass connections molded to the poly tank- and I believe they don't have anode rods either.....

noone 09-23-2013 06:34 PM

That's right. It's a plastic marathon. Am I good without the stainless nipples?

Ghostmaker 09-24-2013 06:16 PM

Getting old didn't catch the marathon. There plastic so no problem.


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