What do I need for 3-way diverting - tub/shower/hand?

ctrenoNovember 24, 2009

I am still trying to figure out this whole pressure balance, thermosattic, diverter stuff. This is for alcove tub with tub spout, showerhead and handshower. I don't need them to run simultaneously, don't care about setting the water temp., and don't care if you have to shut off water to switch from one thing to the other (though it would be great if you could just flip back and forth.) I don't know if it matters as far as this is concerned, but we will have a tankless water heater.

I just need to know what/how many parts I am looking for. Porcelanosa is having a big sale and I am thinking about buying their shower fittings stuff, but I want to make sure that it will work and/or that I get the right pieces. Seems as if it is more common to only divert between tub/shower or shower/handshower but not 3 ways. Any help would be greatly appreciated as I am spending so much time trying to figure this out.

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We did that exact same thing in our bathroom.

I have the water supply going into the Grohe thermostatic controller.

Ours is laid out so that each of the three things, the tub spout, the hand shower and the overhead shower, has their own on/off valve.

This way you can use any of the 3 or all of the three.

Our tankless water heater can only supply 7 GPM so you can't effectively use the the tub spout at the same time as the shower head.

Our master bathroom shower is similar, but has a hand held, rain head, and 4 wall jets. I can use all three at the same time, but the pressure goes down a little.

If that doesn't make sense to you I can post a picture.

I absolutely love this system. My wife set it to 90 degrees, I set it to 100 degrees. No guess work, just set the knob to the temp you want.

With the tankless water heater I can stay in the shower as long as I want.

One thing you need to be aware of with tankless in case you aren't, is that while you will never run out of hot water, you ARE limited to how many people or appliances can use it at the same time. For instance, I can't take a shower while someone else fills the bath tub. The bath tub uses nearly 100% of the water heaters GPM capacity. That will result in my shower being diminished to a trickle.


    Bookmark   November 27, 2009 at 2:12PM
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Thanks Jay. Between your response and what my plumber said about possible issues getting tankless heaters repaired, we have decided to opt for the "old fashioned" tank. I guess we'll go greener in the next house.

    Bookmark   November 30, 2009 at 10:42AM
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From looking at my gas bill I don't see the tankless as "green", the gas usage appears to be about the same as before. But I do enjoy my long luxurious anti-green showers :)


    Bookmark   December 1, 2009 at 2:26PM
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