damn, i wish i was more carefull when i was writing this. thanks to those
who replied. just to close this up, i wan to clarify few things. first of
all, the mains are 3/4" not 1/2" as previously mentioned. Cold is 3/4" from
main shutoff, hot is 3/4" from hwt. the drain is 1-1/2", not 2" as i
thiugh. I wrote the previous message at work, and after coming home I
realized my error. so, given the new h&c w, and the new size of drain -
which is acceptable for 1 shower, is that good enough?
thanks again for help.
I have custom shower with 3/4" thermostatic valve, three 3/4" volume
controls (one for fixed shower arm, the second for hand-held shower and
the third one for body sprays) and 3 body sprays. I have 2" shower
drain and even when all shower units are fully open which represents a
wall of water shower drain works completely OK. I have never had entire
shower bottom which is 5' X 3' under the water.