Return to the Plumbing Forum | Post a Follow-Up

 o
Dielectric fittings on water heater

Posted by dave_mn (My Page) on
Mon, Oct 31, 11 at 14:15

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?


Follow-Up Postings:

 o
RE: Dielectric fittings on water heater

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


 o
RE: Dielectric fittings on water heater

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)


 o
RE: Dielectric fittings on water heater

"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.


 o
RE: Dielectric fittings on water heater

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.


 o
RE: Dielectric fittings on water heater

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.


 o Post a Follow-Up

Please Note: Only registered members are able to post messages to this forum.

    If you are a member, please log in.

    If you aren't yet a member, join now!


Return to the Plumbing Forum

Information about Posting

  • You must be logged in to post a message. Once you are logged in, a posting window will appear at the bottom of the messages. If you are not a member, please register for an account.
  • Posting is a two-step process. Once you have composed your message, you will be taken to the preview page. You will then have a chance to review your post, make changes and upload photos.
  • After posting your message, you may need to refresh the forum page in order to see it.
  • Before posting copyrighted material, please read about Copyright and Fair Use.
  • We have a strict no-advertising policy!
  • If you would like to practice posting or uploading photos, please visit our Test forum.
  • If you need assistance, please Contact Us and we will be happy to help.


Learn more about in-text links on this page here