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Thread: Shower valves run hot only in the last few degrees of rotation

  1. #1
    DIY Junior Member
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    Default Shower valves run hot only in the last few degrees of rotation

    In my house, I have 6 shower/tub valves, all about 15 years old. Each valve, including the kitchen faucet, only gets hot water in the last few (3-5) degrees of handle rotation before full hot. Once hot water is running, moving the handle only a few degrees off full hot gets cold water. Any ideas anybody?

    My theory is there must be a big pressure differential between hot and cold, so that it takes calling for lots of hot water to overcome the cold. However, hot and cold water flow seems about the same.

    Thanks,

    Mark

  2. #2
    Test, Don't Guess! cacher_chick's Avatar
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    Default

    And you have a tankless water heater?

  3. #3
    DIY Junior Member
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    Default

    No, conventional gas, set to about 120 or 130.

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