1/2 or 3/4 PEX to metering shower

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by plumber69, Apr 19, 2017.

  1. plumber69

    plumber69 Member

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    1 1/4" mixing valve will feed 8 metering showers. Would 1/2" PEX branches after the mix valve be enough
     
    Last edited by a moderator: Apr 19, 2017
  2. Terry

    Terry Administrator Staff Member

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    1/2" PEX per shower should be fine.
    The heads only put out 2.5 gallons or less. I run 1/2" PEX for showers often.
     
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  4. plumber69

    plumber69 Member

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    Even though it's a one pipe system?
     
  5. PumpMd

    PumpMd Active Member

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    8 metering showers

    Are they going to be running all at the same time?
     
  6. Terry

    Terry Administrator Staff Member

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    One line? I have no idea what you have in mind then. Don't undersized it then. I think we need more information.
     
  7. plumber69

    plumber69 Member

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    1 1/4 mixing valve then a 1 1/4 Mainfold with 1/2" take offs to each shower. So the water will be a set temp thru one PEX line to the shower.
     
    Last edited by a moderator: Apr 19, 2017
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  8. Terry

    Terry Administrator Staff Member

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    If you have seperate 1/2" to each shower you should be fine.
    So eight lines to eight showers.
     
  9. PumpMd

    PumpMd Active Member

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    Last edited by a moderator: Apr 21, 2017
  10. plumber69

    plumber69 Member

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  11. PumpMd

    PumpMd Active Member

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    Flow Velocity comes from the amount of pressure you have to push more gpm flow through small pipes.

    example,

    The chart I gave you said it can push about 2.4gpm through 1/2" PEX B at 8ft per sec and you will have some psi loss (friction loss) while the shower is running.

    You could just hook up one line going to the shower and test your gpm flow and pressure while it's running. If you don't like the amount of flow and pressure you have with 1/2" PEX, you can use a bigger pipe size to carry more flow and pressure all the way to the very end before you need to reduce your pipe size to hook up to the shower.

    Remember this "The larger the pipe, the less the friction loss, the greater the volume, the better the pressure".
     
    Last edited by a moderator: Apr 21, 2017
  12. Reach4

    Reach4 Well-Known Member

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    That table is from the fittings, and those paths will total very few inches. The pipe velocities will be much less.
     
  13. PumpMd

    PumpMd Active Member

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