Plumbing for 2 shower heads

captncarsJune 9, 2014

We are building a house and added a rain shower head in the master bath. Per my request, In our contract it states it will be a delta thermostatic valve with a 3/6 diverter. I thought it would be easier to control the water temp with one valve and then use the diverter to decide witch showers to run.

Our plumber was there yesterday and plumbed two thermo valves (one for each shower) they said they would change it but I was just wondering if there is pros to having it this way? Seems like a lot of extra work to run water lines to each valve when all he had to do is put a diverter valve above

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snoonyb

And should you want to use both heads simultaneously, you fall victim of the 2.5GPM flow restriction built into the valve, and the two valve set-up will afford sufficient volume, from each.

    Bookmark   June 9, 2014 at 5:31PM
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captncars

I just talked to the builder and he said the plumber did it that way because the pressure will be half if you use both shower heads with the diverter. Is that true?
Looking at pictures on houzz and on here I see almost all double shower heads run with one valve and a diverter.

    Bookmark   June 9, 2014 at 6:12PM
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snoonyb

What do you think meant when I said?

"And should you want to use both heads simultaneously, you fall victim of the 2.5GPM flow restriction built into the valve, and the two valve set-up will afford sufficient volume, from each."

    Bookmark   June 9, 2014 at 11:32PM
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captncars

It makes sense to me... I was just wondering why people plumb it with diverters if there is such a great difference in the pressure?

    Bookmark   June 10, 2014 at 2:22AM
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snoonyb

There is only a reduction in the pressure when both heads are operating, at the same time, from a single valve.

You could have 10M lbs. of pressure on the supply side of the valve.

The valve restricts the flow to a max. of 2.5gpm, divide that volume in half, and thats all you get using a single valve.

    Bookmark   June 10, 2014 at 10:10PM
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