Delta Shower Valve with Temperature Knob

Discussion in 'Shower & Bathtub Forum & Blog' started by themp, Jan 19, 2013.

  1. themp

    themp Member

    Messages:
    76
    Location:
    NC
    I am replacing a shower valve with the Delta universal valve body. The current shower when turned on full hot takes around 2 minutes for the hot water to make it to the shower. So, I usually turn the current valve to full hot, putts around till the hot is full in the shower and then regulate back to normal temperature when I get in. My concern with the separate temperature knob is that if I leave it at the normal setting for showering it is going to take longer to get the hot water up and use more water while waiting. So, I am leaning to not buying the separate temperature knob, and just get the on/off knob and do as I do now to get the water up to temperature. I like the concept of a separate knob, but is it worth it really?

    Tom
  2. LLigetfa

    LLigetfa DIYer, not in the trades

    Messages:
    4,157
    Location:
    NW Ontario, Canada
    Assuming that the vanity would be on the same branch, can you not just run the hot at the sink first? That is what I do. The temp setting on my Delta shower valve never needs adjusting and I love it. I can turn the water on and off between shampooing and lathering and always get the same temp.

    Maybe you should consider a recirc pump.
  3. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    22,268
    Location:
    New England
    With the shower running 2-minutes, you're wasting around 5-gallons of water. If you don't have a well, (and even if you do, you're wasting electricity to pump it up), and the waste running down the drain (you're paying sewer charges or maybe stressing the leach field), it seems like a really big waste to not consider a recirc system. Keep in mind that you are heating that 5-gallons or so, even though it isn't giving you any benefit in your shower and making the WH look like a smaller one, since you've dumped probably around 10% of it down the drain before you get any hot water to shower with. There are lots of recirc systems. Yes, it's better to have a dedicated return line which might be hard to retrofit, but with the right system, it isn't a really big impact to use the cold water as the return line. I don't have any stock or other interest in this, but nearly 7-years ago now, I installed a RedyTemp unit and I get nearly instant hot water at the shower. I have it set to only get warm at the sink, but the shower is closer. If I flush the toilet, by the time I get to the sink, it has purged the warm water from the cold line, and I have full use of both the hot and the cold. Because it gives you the ability to set how warm the water gets before it shuts off, you can make the system more energy efficient since you have at least warm at the sink all the time, with hot shortly after. In my setup, the shower is closer to the WH than the sink, so it gets hot quicker. Since that hot water has to pass by the rest of the fixtures in my place, I get hot sooner everywhere. Tests have shown, a properly setup system, used during 'normal' hours (shutoff overnight) saves energy. Even if it didn't, the convenience is worth it to me. WHen I remodeled, I ran a drop to put a receptacle under the vanity. Once there, it took all of about 10-minutes to hook up the recirc system. Power is usually easier to obtain at the WH, but then you have to do more plumbing to get it all to work. Both types work well.
  4. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    27,049
    Location:
    Cave Creek, Arizona
    Without the temperature knob, you cannot control the volume, just the temperature by moving the handle. Get the 1700T, thermostatic, core and it will ONLY run "hot" water until the temperature rises to the point where it has to mix cold water to maintain the desired temperature.
    Last edited: Jan 20, 2013
  5. LLigetfa

    LLigetfa DIYer, not in the trades

    Messages:
    4,157
    Location:
    NW Ontario, Canada
    True, but I've never had a desire to run it less than wide open.

    +1
    I contemplated going up to that but cheaped out.
  6. themp

    themp Member

    Messages:
    76
    Location:
    NC
    1700t

    Awesome idea! Thanks...
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