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justin68
Connecting Copper to Galvanized

I'm hoping someone can help me.

Last year I had a new hot water heater installed.

They connected the hot water heater to the existing galvanized plumbing (my house was built in 1942).

I understand the use of the dielectric union as seen in this actual picture (Picture One) from my house:
PICTURE ONE

What I don't understand is that the fitting (circled in green) in the next picture (Picture Two)seems to be going directly into the galvanized pipe, but it looks like copper (I thought that was incorrect):
PICTURE TWO

Here's another connection with the same fitting (see Picture Three):
PICTURE THREE

So what type of fitting is in pictures TWO and THREE?

Any help would be appreciated since I'm going to start replacing the galvanized myself with copper.
:)

Dave357
Re: Connecting Copper to Galvanized

Those are male sweat adapters. You're right...dielectric unions should have been used here. Nothe the corrosion that's developing on the threads of the male adapters.

justin68
Re: Connecting Copper to Galvanized

Thanks Dave....
That's why I thought, but then I doubted myself because they used dielectric unions on the stubs connecting to the hot water heater

and to small section they had to replace

but KNOWINGLY did not use them in two places (i.e., pictures two and three from my post)

That's seems capricious and slightly unprofessional.

how should it have been done at those T-fittings?

Ernie_Fergler
Re: Connecting Copper to Galvanized

Adding a galv nipple to the galv tee and then cut back the copper to sweat on the dielectric union, would do it, in my opinion.
But then I'm a sparky:D

justin68
Re: Connecting Copper to Galvanized

Thanks Ernie,

That's what I thought to.....I guess they took the 'easy way out':mad:
which seems unfair since they know it will fail down the line.

I guess I should unsolder the male adapter and then solder a new copper "T-Fitting" and then run the copper so I can avoid a 'future disaster." :)

Here's the "opposite side" of PICTURE THREE from above (note the electrolysis):

......MEMO: I checked my installation records and my hot water heater was replaced in 2003, so what you are seeing
represents electrolysis after only 5 years.

Here's the larger view of the connection (note my comments on the picture):

........ I guess I should start the replacement back at fitting "A"?

Ernie_Fergler
Re: Connecting Copper to Galvanized

Or somewhere along the length of copper marked "B".
Try to judge how much copper to save is part of the fun...:D

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