Is it compulsory (code required) to put a union between cold/hot connection and flexible hose?

Discussion in 'Water Heater Forum, Tanks' started by curiousv, Jan 28, 2021.

  1. curiousv

    curiousv Member

    Nov 14, 2019
    Tacoma WA
    This is branford white lowboy water heater and instruction manual says should put union between cold water supply line and blue connector on top of tank ....
    I am using connector like this -

    Which steel flexible connector
    My question is .. can I put this connector directly on to top of that blue connector ? or I must have a union ?

    On hot side I did put a union because I had a union spare ..and flexible hose was little short but on cold side is it MUST?

    What will happen if I don't put union and cold side between this flexible hose and blue connector?

    my theory is ..less joints are less chances of leaks. @Terry
  2. breplum

    breplum Member

    Oct 2, 2004
    Plumbing and heating contractor
    San Francisco Bay Area
    Nut x Nut flex is equal to a union and best practice.
    We've been putting flex on water heaters for 40 years, and a requirement in all seismic locales (all of CALIF.)
    curiousv likes this.
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  4. Terry

    Terry Administrator Staff Member

    Aug 17, 2004
    Bothell, Washington
    Flex connectors in Washington State.
    That's Mt. Rainier in the distance. It's earthquake country.


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