Dielectric fittings on water heater

dave_mnOctober 31, 2011

I am installing a new Marathon water heater next week. The cold/hot connections coming out of the heater from the factory are brass (or bronze?). Do I need dielectric fittings or just connect up to copper?

Thank you for reporting this comment. Undo

Not needed. They are used when connecting copper to galvanized pipe.

    Bookmark   November 1, 2011 at 7:10AM
Thank you for reporting this comment. Undo

The inlet/outlet on my (now 10+ year old) State heater are steel. The original installer said dielectric fittings weren't needed, but the connections began to corrode over the next few years. I finally went back and installed them myself, plus a fat copper ground jumper between the copper piping.

That reminds me that it's probably time to think about replacing the anode rod again.

Don't most HW tank heaters have some sort of coated steel tank? I'd think that, if you have copper piping, you'd need some sort of break in there somewhere (maybe included by the mfr in the OP's example with brass fittings)

    Bookmark   November 3, 2011 at 3:44PM
Thank you for reporting this comment. Undo

"They are used when connecting copper to galvanized pipe."

Water heaters are normally a glass lined steel tank.

The dielectric fitting may be built into the inlet and outlet of the tank.

Check the instructions.

If the outlets are already brass you should not need another dielectric fitting to connect copper pipes.

    Bookmark   November 3, 2011 at 4:19PM
Thank you for reporting this comment. Undo

It would ultimately depend upon your local code.

Technically speaking, dielectric fittings are only required when connecting copper to a ferrous metal pipe appliance therefore if the connections on your water heater are copper the dielectric fittings would not be required,,,BUT..In some jurisdictions they require the dielectric fittings on all water heaters. Its a case of the code is lagging behind the state of the art technology, but you can't fight city hall.

    Bookmark   November 4, 2011 at 4:41AM
Thank you for reporting this comment. Undo

Marathon's claim to fame is non-metallic tanks. No anode, no dielectrics.
As noted, if you had galvanised piping then connections would require galvanic break.

    Bookmark   November 4, 2011 at 6:11AM
Sign Up to comment
More Discussions
Septic tank and question on the "Sponge"
I have a septic tank that when last pumped out had...
Fleck 5600SXT 64k Setup
Well I recently had a new water softener installed...
Can we bypass old hot water heater?
Any reason we can't bypass and then remove this old...
LaToscana Novello Thermostatic Shower Valve
Trouble with LaToscana Novello Shower Valve- no hot...
Freezeless Hydrant Frozen??
Hi, I have freezeless hydrant that has never given...
People viewed this after searching for:
© 2015 Houzz Inc. Houzz® The new way to design your home™