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Old 09-23-2013, 05:05 PM   #1
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Can I use an MPT fitting on this hot water outlet?


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.
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Old 09-23-2013, 05:29 PM   #2
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Can I use an MPT fitting on this hot water outlet?


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

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Old 09-23-2013, 05:49 PM   #3
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Can I use an MPT fitting on this hot water outlet?


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.
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Old 09-23-2013, 06:00 PM   #4
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Can I use an MPT fitting on this hot water outlet?


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Originally Posted by Ghostmaker View Post
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.....
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Old 09-23-2013, 06:34 PM   #5
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Can I use an MPT fitting on this hot water outlet?


That's right. It's a plastic marathon. Am I good without the stainless nipples?
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Old 09-24-2013, 06:16 PM   #6
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Can I use an MPT fitting on this hot water outlet?


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

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