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Is a Dielectric Union Necessary on EVERY water heater?

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  • Is a Dielectric Union Necessary on EVERY water heater?

    Have been told that going copper right into the top of the tank, a dielectric union is not necessary. Galvanized yes, copper, no.

    True or False?

    thanks!!!!

  • #2
    Re: Is a Dielectric Union Necessary on EVERY water heater?

    Originally posted by batdude View Post
    Have been told that going copper right into the top of the tank, a dielectric union is not necessary. Galvanized yes, copper, no.

    True or False?

    thanks!!!!
    False, you have it mixed up. Copper to the water heater needs either a dielectric union or a brass fitting to make the transition. Galvanized can be hooked directly to the water heater just fine.
    Ron Hasil Lic #058-160417
    Ron's Facebook
    A-Archer Sewer & Plumbing specializing in:
    Tankless Water Heaters | Drain and Sewer Cleaning
    Sump and Ejector Pumps | Backflow RPZ Testing

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    • #3
      Re: Is a Dielectric Union Necessary on EVERY water heater?

      When I did full service plumbing I hooked up water heaters with direct copper connections. The tank will go bad long before the connection will.

      Transition from galvanized to copper in every other case requires a dielectric union, IMO.

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      • #4
        Re: Is a Dielectric Union Necessary on EVERY water heater?

        i've seen a few that leaked, but that was along time ago. none recently. yes on galy to cop.

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        • #5
          Re: Is a Dielectric Union Necessary on EVERY water heater?

          I usually install brass nipples with dielectric unions. The best way, in my opinion, is to use stainless nipples with dielectrics. That's with copper water lines, of course.

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          • #6
            Re: Is a Dielectric Union Necessary on EVERY water heater?

            brass nipple with fip x sweat ground joint union is how i do em..

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