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Old 10-14-2013, 08:46 PM   #1
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Corrosion on water heater hot-side nipple


I installed this water heater 9 months ago, and it already has what looks like corrosion on the hot connection. Suggestions on what could be the problem? It almost looks like the teflon tape has actually started to break down (the white residue), but there is surface rust in there too.

I'm not sure why the copper is black, but it's just the surface that does scrape off and this copper was reused so it could've been on there already. The copper was definitely not heated anywhere near this connection.

Insulating foam had been installed all the way down to the water heater (over this connection), which I've just trimmed back. Could that have added to the problem?
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Old 10-14-2013, 09:09 PM   #2
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Corrosion on water heater hot-side nipple


Is that a dielectric nipple on top of the tank?

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Old 10-14-2013, 09:15 PM   #3
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Corrosion on water heater hot-side nipple


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Is that a dielectric nipple on top of the tank?
I believe the groove in the nipple indicates dielectric nipple.
I bet you used only tape, huh.
You've got a reeeeally slow leaker
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Old 10-14-2013, 09:18 PM   #4
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Corrosion on water heater hot-side nipple


Maybe a little sloppy with the flux ; )
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Old 10-14-2013, 09:24 PM   #5
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Corrosion on water heater hot-side nipple


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I believe the groove in the nipple indicates dielectric nipple.
I bet you used only tape, huh.
You've got a reeeeally slow leaker
You're probably right and he probably screwed the female adapter on then sweat everything together.. Instead of pre soldering them..then screwing everything together
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Old 10-14-2013, 09:31 PM   #6
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Corrosion on water heater hot-side nipple


It is a dielectric nipple. The female adapter was soldered piece of copper 12+ inches, allowed to cool, then screwed on.

Only used tape on the threads.
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Old 10-14-2013, 09:33 PM   #7
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Corrosion on water heater hot-side nipple


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It is a dielectric nipple. The female adapter was soldered piece of copper 12+ inches, allowed to cool, then screwed on.

Only used tape on the threads.
Pipe thread paste should be used as well over the tape
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Old 10-14-2013, 09:40 PM   #8
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...he probably screwed the female adapter on then sweat everything together.. Instead of pre soldering them..then screwing everything together
No one told me about that either (until after I screwed up a couple times).
"Some things need to be learned the hard way"
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Old 10-14-2013, 09:44 PM   #9
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Corrosion on water heater hot-side nipple


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Pipe thread paste should be used as well over the tape
I've never heard this before. Guess I have egg on my face. Thanks, guys.
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Old 10-15-2013, 06:14 AM   #10
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I've never heard this before. Guess I have egg on my face. Thanks, guys.
Don't be so hard on yourself, it will be OK for years.

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