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Old 09-17-2017, 12:18 PM   #1
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Walk - In Shower with Multiple heads


I just demo'ed an existing bathroom tub shower combo and want to install a new walk-in type shower with multiple heads.....maybe 3 one rain overhead and 2 side mounts.

Plumbing is not my background and someone said I may need to add a pump to provide sufficient water pressure.

Can anyone point me in the right direction please.
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Old 09-17-2017, 01:09 PM   #2
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Re: Walk - In Shower with Multiple heads


There is no need for a pump, increasing the supply line size all the way back to where you can tie into at least a 3/4 will be.
The issue will be flow not pressure, not enough flow then the pressure goes down.
A 3/4 line has almost double the available flow of a 1/2" line.
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Old 09-17-2017, 01:22 PM   #3
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Re: Walk - In Shower with Multiple heads


If the space is a standard 32" x 60" tub size, then you may not have room for a "walk in" unit with multiple heads. I built one in our weekend rental cabin, but it is 4' x 8' with the heads on the walk in wall, hitting the outside wall. No door or curtain necessary.

As Joe said, it is volume, not pressure. In addition (and I believe Delta includes this in their brochures) rainheads will need to be piped with copper so the friction will be reduced. CPVC and PEX, both have thicker walls and the volume will be reduced by the narrower necking down of the pipes. Just something to think about.
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Old 09-17-2017, 02:51 PM   #4
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Re: Walk - In Shower with Multiple heads


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Originally Posted by chandler48 View Post
If the space is a standard 32" x 60" tub size, then you may not have room for a "walk in" unit with multiple heads. I built one in our weekend rental cabin, but it is 4' x 8' with the heads on the walk in wall, hitting the outside wall. No door or curtain necessary.

As Joe said, it is volume, not pressure. In addition (and I believe Delta includes this in their brochures) rainheads will need to be piped with copper so the friction will be reduced. CPVC and PEX, both have thicker walls and the volume will be reduced by the narrower necking down of the pipes. Just something to think about.

The walk-in will be 77" wide 48" deep. A

re you saying all the new supply piping should be copper?
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Old 09-17-2017, 02:54 PM   #5
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Re: Walk - In Shower with Multiple heads


Good size. No, just the riser pipe to the rain head. The others don't require a lift like the rain head and should be OK. I'd just use PEX.
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Old 09-17-2017, 03:05 PM   #6
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Re: Walk - In Shower with Multiple heads


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Good size. No, just the riser pipe to the rain head. The others don't require a lift like the rain head and should be OK. I'd just use PEX.
PEX instead of CPVC......never used it but ok.
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Old 09-17-2017, 03:46 PM   #7
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Re: Walk - In Shower with Multiple heads


You can use whichever you feel comfortable with. CPVC requires no tools, and is a good product. If that is what you have, continue with it. PEX is just "gooder"
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Old 10-10-2017, 05:01 PM   #8
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Re: Walk - In Shower with Multiple heads


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Originally Posted by joecaption View Post
There is no need for a pump, increasing the supply line size all the way back to where you can tie into at least a 3/4 will be.
The issue will be flow not pressure, not enough flow then the pressure goes down.
A 3/4 line has almost double the available flow of a 1/2" line.
To be clear for a rain head you need to tie into a 3/4" line all the way to the Diverter Valve and then back out of the Diverter Valve from 1/2 to 3/4" to the rain head?

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Old 10-10-2017, 08:21 PM   #9
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Re: Walk - In Shower with Multiple heads


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3/4" line all the way to the Diverter Valve
Why? You won't be getting but 1/2" of volume through the diverter. The 3/4" pipe will be under supplied. I believe Delta does recommend copper riser pipes to the rain head with their units. Thinner walls then pex or CPVC and less friction.
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Old 10-11-2017, 06:04 AM   #10
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Re: Walk - In Shower with Multiple heads


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Why? You won't be getting but 1/2" of volume through the diverter. The 3/4" pipe will be under supplied. I believe Delta does recommend copper riser pipes to the rain head with their units. Thinner walls then pex or CPVC and less friction.
That was my understanding also from the advice received on this thread.
There is no need for a pump, increasing the supply line size all the way back to where you can tie into at least a 3/4 will be.
The issue will be flow not pressure, not enough flow then the pressure goes down.
A 3/4 line has almost double the available flow of a 1/2" line.

Does the diverter need to have 3/4" outlets and inlets?
Please explain...
I apologize for my lack of knowledge as plumbing is not my back ground.

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Old 10-11-2017, 06:11 AM   #11
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Re: Walk - In Shower with Multiple heads


If you can find a diverter with 3/4" fittings, yes, that would help, but with only 1/2" it becomes a choke point.
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Old 10-11-2017, 05:31 PM   #12
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Re: Walk - In Shower with Multiple heads


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Originally Posted by chandler48 View Post
If you can find a diverter with 3/4" fittings, yes, that would help, but with only 1/2" it becomes a choke point.
All the diverters I've looked at "online" are 1/2".....

I'm installing (2) similar to this except delta valve and trim and kohler hand held


I'm assuming no need for the 3/4" copper pipe run without a valve with 3/4" outlets and inlets
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Old 10-12-2017, 11:35 AM   #13
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Re: Walk - In Shower with Multiple heads


I'm looking at a Delta valve with 1/2" inlets and outlets that will operate (2) heads (rain and body sprayers) at the same time and per the Delta rep 1/2" inch water pipe will supply enough pressure for a shower head and body sprayers as long as you use copper or galvanized for the piping.

Last edited by PappyO; 10-12-2017 at 11:41 AM.
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Old 10-12-2017, 01:21 PM   #14
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Re: Walk - In Shower with Multiple heads


You might want to look at the rain shower head too. We put in a Hans Grohe rain head that only uses 1.5gpm but feels like 3x that volume because it has a valve in it that uses the water pressure to suck in air and make the water drops feel bigger. It's AMAZING!! But as with most amazing things, it also cost more...$300 just for the rain head itself.
The nice thing about this rain head was that it didn't require us to repipe the whole house to get a nice shower experience.
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