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Thread: Does Pressure balanced Fixtures make Mixing valves obsolete?

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    DIY Junior Member Young_apprentice's Avatar
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    Default Does Pressure balanced Fixtures make Mixing valves obsolete?

    Now all valves seem to come pressure balanced showers even faucets. are mixing valves even necessary anymore?

    Is their any application that they are useful or needed. The only example i could think of would be being able to divert super hot water to clothse washer or sanitation devices but they would have to have multiple ports one for Tempered water going to fixtures one for cold, one for hot to mix, and one straight hot from the water heater that is piped directly to sanitizing fixtures. I think watts makes one like that.

    For what reason would you install a tempering valve on a hot water system?

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    Plumber jimbo's Avatar
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    Pressure balanced is the "poor man's solution" to anti-scald. It does not allow you to set the WH temp high. If the WH is 140+ you can still jump in and get scalded. You are just protected from "the flush". So I would say NO....tempering or mixing valves are not obsolete.

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    Quote Originally Posted by jimbo View Post
    Pressure balanced is the "poor man's solution" to anti-scald. It does not allow you to set the WH temp high. If the WH is 140+ you can still jump in and get scalded. You are just protected from "the flush". So I would say NO....tempering or mixing valves are not obsolete.
    Do the pressure balanced valves you install have a temp limiting stop???? Mine do. I get service calls all the time with people complaining that they cant get much hot water at the shower but it will burn your hand at the lavatory.

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    Retired Defense Industry Engineer jadnashua's Avatar
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    Quote Originally Posted by Hackney plumbing View Post
    Do the pressure balanced valves you install have a temp limiting stop???? Mine do. I get service calls all the time with people complaining that they cant get much hot water at the shower but it will burn your hand at the lavatory.
    I'm pretty sure all PB shower valves also have some means of setting max temp as do thermostatically controlled valves. That doesn't mean that people realize they are there and adjust them properly.
    Jim DeBruycker
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    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

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    Quote Originally Posted by jadnashua View Post
    I'm pretty sure all PB shower valves also have some means of setting max temp as do thermostatically controlled valves. That doesn't mean that people realize they are there and adjust them properly.
    The same could be said about a thermomixer.

    A thermomixer is a more precise appurtenance. Its a higher level of protection compared to pressure balanced with a temp limiting device. The thermomixer actually reacts to the temp of the water.....a pressure balance valve with temp limiter does not actually react to water temp but only changes in pressure. I'm certain you already know this but maybe some others dont.

    I have a discontinued Symmons 5-200 thermomixing 3/4 inlets and a 3/4 outlet for sale cheap. Its new in the opened box and has never been installed.....all the paperwork included. 165.00 with free UPS shipping if you live in a resonable location....LOL. I think it retailed for around 500.00.
    Last edited by Hackney plumbing; 04-03-2012 at 03:59 PM.

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    DIY Junior Member Young_apprentice's Avatar
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    Once again thanks guys- you all have some much info i have know idea how you all KNOW so much i just bought siggentheilers book on Modern Hydronic heating maybe that will help me out.

    Ok so PB valves do come with Temp limiting stop- i usally just chuck it or set it up so it makes no difference. Do regular LAV faucets have limiting devices that i do not know.... Yeah so the PB Really is just a cheap anti-scald i flush the toilet and saves my skin from the lower volume of cold water thats coming into the shower valve. But the PB valve does little for me IF i have a faulty WH and it creeps up in temperature the PB piston is not going to react to the increase in Water temp. It seems like thermostatic mixing valves do regulate supply temperature which will regulate The temp coming out of say the shower. As they have little thermostats that expand and contract to keep a desired Temperature- Right?

    I guess now im wondering why we don't install thermostatic mixing valeson all WH. they seem to do alot of good stuff kill bad backteria/prevent scalding/ thermal shock/ Yet honestly i only think ive seen them on 2 water heaters in my short short career. IVe seen them all the time feeding Radiant heat which takes cooler water


    But For what reason would you install a thermostatic mixing Valve.
    Last edited by Young_apprentice; 04-05-2012 at 02:38 PM. Reason: bad spelling

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