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Supply size for shower heads body sprays 10 gpm ?
Have 75 psi water. Supply to house is 1 inch then down to 3/4. Current bath has 1/2 copper run about 20 feet to tub with three 90 elbows. I am installing 4 2.5 gallon spray heads. 10 gpm on 1/2 split between hot and cold makes me think the hot is not enough in the winter when it will be 90 percent flow though the hot water pipe. I am thinking about running another 1/2 hot and tying in making it then become 3/4. Could one justify doing just the hot and not the cold. Access is limited with the original copper pipe run. Other wise I would just change it all out. Thanks for the thoughts if I need to run cold also and make sure the extra line is needed. Thanks