unions and pex

Discussion in 'Water Heater Forum, Tanks' started by ginahoy, Sep 12, 2009.

  1. ginahoy

    ginahoy Building Systems Engineer

    Dec 23, 2006
    Sierra Vista, AZ
    My house is plumbed with pex, but the water heater connections are made with with 18" runs of copper flex. I noticed there are no di-electric unions installed between the flex and the tank nipples. I'm replacing my water heater next week and will add unions if necessary. Was the plumber correct to omit the di-electric unions in this case?
    Last edited: Sep 12, 2009
  2. Master Plumber Mark

    Master Plumber Mark Master Plumber

    Feb 6, 2005
    Sensitivity trainer...to be caring and loving to a
    indianapolis indiana - land of the free, home of
    its ok...

    they are used when dis similar metals are touching

    i your case, its all plastic, so it dont matter...

    no electralysis can happen..

    anymore I install my heaters with quick connects
    from the copper plumbing to the heater,,

    I beleive they extend the lifetime of th heater..

    quick connects are like dialectric unions on .....steroids......
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