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Anti-scald mixing valves in showers?

 
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I'm looking to set up an outside shower and it will be solar heated water.  It might get pretty toasty.

I think some shower valves have a mixing function built in so that you can't accidentally burn yourself.  Do all valves have that?  I'd love to get an older valve from the Habitat restore but not if I have to worry about the temp mixing or add another mixing valve.  Is there a reasonable way to look at a valve and see if it has that function?

Both the hot and cold water would be pressurized.  

Thanks!
 
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I believe that anti-scald valves have been around for roughly 50 years but were slow to catch on. Not all valves have an anti-scald so you will have to inspect the valves yourself to tell for sure.
 
Mike Haasl
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Thanks Timothy!  Is there a way for normal person to tell if a valve they're looking at has that function?
 
Timothy Norton
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Mike Haasl wrote:Thanks Timothy!  Is there a way for normal person to tell if a valve they're looking at has that function?



I had a bit of a hard time to find a visual but I think I got one.

https://plumbingtoday.biz/blog/why-am-i-getting-hot-water-everywhere-but-the-shower#:~:text=Locate%20your%20anti%2Dscald%20device,what%20this%20might%20look%20like.&text=Remember%2C%20though%2C%20that%20not%20all%20faucets%20have%20this%20device%20installed.

Look at the picture under Problem #1, Step #2. It gives a visual of what it should look like. An adjustable plastic piece at the front of where the valve would be.

Another thing to look up is a "Thermostatic Mixing Valve".

Look at some google results for both and you will get a feel of what you are looking for.
 
Mike Haasl
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Gotcha, thanks Timothy!  So it looks like the anti-scald device inside the faucets only limits how far the handle goes so if the hot water is coming in at 180F, it may not limit the temp that much...  Sounds like the thermostatic mixing valve may be a solution.  Thx!
 
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Mike, in australia all new homes must have them..
 
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