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

A standard shower only has a 1/2" connection and many are now integrally ported to be low flow. the specialty shower valves that are very costly have a 3/4" connection and are not port restricted. I am supposing you are using 2 setups? 2 shower controls to operate the whole thing. Getting the temperature the same will be easy if you are alone in the shower. I did the 2 valve thing in a large shower in my house in Florida and it seemed like it would be enjoyable, however, she like cold showers and I liked hot. When she bent over to rinse her hair I got the shock of my life. I was not expecting it and after that the double controls were not used.
Also, I hope you got a good tankless water heater to meet your new demand for a lot of hot water.

A 3/4 inch pipe will flow 8 to 10 GPM, but through all of the plumbing you are talking about in the shower it will be reduced a little. I hope you water heater will keep up with the demand.