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Thread: unions and pex

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  1. #1
    DIY Member ginahoy's Avatar
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    Dec 2006
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    Sierra Vista, AZ
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    Question unions and pex

    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 by ginahoy; 09-12-2009 at 04:37 PM.

  2. #2
    Master Plumber master plumber mark's Avatar
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    Feb 2005
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    indianapolis indiana - land of the free, home of the brave....
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    Talking 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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