Hello all,first time user here. Have gone through some previous questions and answers here and seems to be a good knowledge base. I hope someone can help answer my questions. Thank you.
I am in the process of adding a master bedroom and bath to my house. In the new shower (60"x60") I would like to have 2 handheld spray heads and 8 bodyspray heads in total but divided and setup on opposing walls. Each wall would have 1 handheld unit that puts out 5 gpm and 4 bodyspray units that put out 2 gpm each. Each wall, all heads operating would need 13 gpm, both walls 26 gpm total.
My question is will a 3/4" supply line at 60 psi give enough flow (gpm) and pressure (psi) to operate all heads at the same time and what size drain would be needed to accommodate such a setup.
What would I need to make this work as intended.
Thank you for any help. Andy

Hello all,first time user here. Have gone through some previous questions and answers here and seems to be a good knowledge base. I hope someone can help answer my questions. Thank you.
I am in the process of adding a master bedroom and bath to my house. In the new shower (60"x60") I would like to have 2 handheld spray heads and 8 bodyspray heads in total but divided and setup on opposing walls. Each wall would have 1 handheld unit that puts out 5 gpm and 4 bodyspray units that put out 2 gpm each. Each wall, all heads operating would need 13 gpm, both walls 26 gpm total.
My question is will a 3/4" supply line at 60 psi give enough flow (gpm) and pressure (psi) to operate all heads at the same time and what size drain would be needed to accomodate such a setup.
What would I need to make this work as intended.
Thank you for any help. Andy


Well, having all four, and it is actually four, separate functions going on at the same time will definitely overtax a 3/4" feed.

I'm assuming you will have two separate mixing valves -- One for each of the zones.

If it were me, I would run 1-1/4 to the shower location and then branch off with 3/4" feeds to each mixing valve.

Also, considering the square footage we're talking about here -- Why no fixed shower heads? And what about an overhead rain pan showerhead?

As for the drain -- A 2" shower drain should be sufficient for 26 gpm -- But I think you are going to realize a great deal more than 26 gpm.

I'd suggest two 2" shower drains for the set-up you describe.

iamgrowler, thanks for your response. The hand helds are wall mont also, alston intuitve is the head. Please explain how it is possible to obtain more than 26 gpm (2 alston @ 5gpm + 8 @ 2gpm = 26gpm).
Also I only have (1) 3/4" line coming into the house now, if I split that, will that give me a
1-1/2" feed. Can you diagram this for me possibly. Remember the existing 3/4" feed is already feeding a kitchen and 1-1/2 baths now with a few outside faucets.
Many thanks for your help. Andy

Sorry, guess I spoke before asking the size of your incoming waterline.

Increasing a 3/4 to 1-1/4 or 1-1/2 is out of the question -- You would be cussing me every time the venturi action at the transition caused the flow to surge as it tried to catch up.

At this point, the best thing you could do for yourself is to balance the system by making sure both mixing valves and your volume controls all have 1/2" inlets and outlets.

As for the body sprays -- Make sure you follow the manufacturers installation guidelines to the letter -- You will need to create a manifold with piping of equal length to ensure each body spray receives the same amount of pressure and volume.