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Thread: 3/4 inch supply line to master bath, but 1/2 inch line at shower valve?

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  1. #1
    DIY Junior Member barbourdg's Avatar
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    Default 3/4 inch supply line to master bath, but 1/2 inch line at shower valve?

    Need some help with our bathroom remodel.

    We have 3/4 supply lines coming into the master bathroom (sink and shower) and about 5 feet of 1/2 inch to the bathtub. We are doing a complete remodel and the bathtub 1/2 line is closest to the new shower location. We are installing a Kohler Water tile Rain Head, 3 body sprays and hand shower.

    So what makes more sense.

    1. Use the 1/2 inch line with a 1/2 inch valve
    2. Use the 1/2 inch line, but with a 3/4 inch valve
    2. Cap off the 1/2 inch line and reroute one of the 3/4 supply lines to the valve?

    The system would never have more then 2 devices running at the same time, plus we have a 60 gallon water heater. So we don't want a 5 minute shower either.

    Thanks for the advice!

  2. #2

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    Whats your water pressure run?

  3. #3
    DIY Junior Member barbourdg's Avatar
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    Default

    From what I hear my city averages about 60 PSI.

  4. #4

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    What kinda volume are we looking at per body spray??? The handheld and the rainhead are suppose to be limited to 2.5 gal per minute at 80 psi I believe. We need to calculate how much water you will be needing with two functions in use.
    Most 1/2" shower valves will run over 7 or 8 gallons a minute.

    Check the specs on the 1/2 valve and see what it will flow with the 60 psi you have compared to the total of the gallons your two functions will use.

  5. #5
    DIY Junior Member barbourdg's Avatar
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    We haven't bought the valves yet, but here are the options:

    Pressure Balancing Valve (Rite-Temp)
    3/4 Valve - 13.0 gpm
    1/2 Valve - 5.0 gpm

    or

    Thermostatic Valves (Master Shower)
    3/4 Valve - 17.2 gpm
    1/2 Valve - 10.9 gpm

  6. #6

    Default

    I would use the 1/2" thermostatic.

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