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Thread: Installing thermostatic mixing valve

  1. #1

    Red face Installing thermostatic mixing valve

    I am installing a thermostatic mixing valve in my shower. Instruction manual says to install water hammer arrestors. The shower that I am replacing had no such arrestors and there was no noise from the pipes. That being said do you think arrestors would be required in this case? Also what is the best way to securse the mixing valve to the 1x4 backing? The valve is fairly heavy.

  2. #2
    Retired Defense Industry Engineer jadnashua's Avatar
    Join Date
    Sep 2004
    New England


    Always follow the manufacturer's instructions - if they say to install arrestors, do it. Use the piston/cylinder type, not just a simple air chamber. Oatley and Sioux City make some, and I'm sure other companies.

    Some of the valves have screw holes to anchor them, some you need to use some straps or clamps. Sometimes, you have to get creative.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  3. #3
    Plumber jimbo's Avatar
    Join Date
    Aug 2004
    San Diego


    I don't have any experience with the thermostatic valves....too pricey, I guess! But I do think they use a wax-type cartridge in the temperature regulating section. I can envision where this type of device would not be happy with any water hammer, so I understand the recommendation. I would try to find a place, near the shower but not in the wall, to put these if at all possible.


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