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Thread: Installing a Thermostatic Mixing Valve

  1. #1
    DIY Junior Member tilleyd's Avatar
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    Default Installing a Thermostatic Mixing Valve

    Hello,

    My whirlpool tub runs out of hot water and I was advised by the water-heater manufacturer(AOSMITH Vertex) to install a thermostatic mixing valve and then set the water heater to the highest setting. They said this would also be more energy-efficient.

    Now, I'm not a plumber but I do like to take on DIY projects. Can you please share a good brand Thermostatic Mixing Valve that is easy to install and does not require complex techiques? I would love to try installing one myself. Also a helpful video of the process would be greatly appreciated. Any help is appreciated!

    Thanks,
    Tilley

  2. #2
    Forum Admin, Expert Plumber Terry's Avatar
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    I like the Honeywell



    http://www.terrylove.com/forums/show...er-tempering-)

    I would not use an Apollo.
    Last edited by Terry; 05-13-2013 at 10:20 AM.

  3. #3
    In the Trades Tom Sawyer's Avatar
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    A lot depends on the size and recovery rate of your water heater and the size of your whirlpool and the flow rate of the faucet.
    [B]No, plumbing ain't rocket science. Unlike rocket science, plumbing requires a license[B]

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    DIY Junior Member essjay's Avatar
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    Are there any limitations to using a thermostatic mixing valve or are they set and forget? Any preventative maint. required?

    The install instructions describe setting a temp strip on the mixed output and adjusting to desired temp. BUT, if there is a big temp swing in cold water supply between winter and summer months (think 30 degrees plus) will this valve be able to handle the swing? Have not found any documentation regarding this point.

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    Forum Admin, Expert Plumber Terry's Avatar
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    It locks in the temperature.

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    DIY Junior Member tilleyd's Avatar
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    According to my conversation with Aquatic Bath & Tub, Terry is correct. These valves lock in the temperature, mixing in the correct amount of cold water, regardless of the initial water's temperature. Supposedly this will save me a lot of $$$ on my energy bill and also provide a longer lasting supply of hot water. I look forward to testing this out!

  7. #7
    Retired Defense Industry Engineer jadnashua's Avatar
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    Where I live, they are required on ALL WH installations/replacements as a safety feature. Running your tank hotter will not save you money for energy, since the hotter the tank, the more standby losses there are. It does not make much of any difference in the actual heating of the water, though, as it takes the same amount of energy to actually heat it. It does provide safety and an effectively larger WH (if you raise the storage temp) delivered volume, since it's mixing some cold into the output which means for each gallon of hot delivered to the fixture, you're using less than a gallon of heated water. It can allow you to get by with a smaller tank, which has some benefits in costs and space, though. It's not magic, though, when your tank cools off below the mixing valve, you'll get essentially straight out of the tank, depleting what little hot water's left faster since it will no longer be mixing in cold to 'temper' the output. These things are often referred to as a tempering valve.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  8. #8

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    Quote Originally Posted by Terry View Post
    I like the Honeywell



    http://www.terrylove.com/forums/show...er-tempering-)

    I would not use an Apollo.
    You strike my curiosity - why not Apollo? My supplier used to stock Cash-Acme, but has switched to Apollo - so I have been using these for about a year now.

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