Originally Posted by rmachon
I know it's counter intuitive to go from 3/4" copper main to 1" pex, but...
...the main is 3/4" but splits immediately into 1/2" cold and 1/2" to the hot water heater. I'm thinking I need to re-plumb all the way back to the 3/4" copper main.
If you have 3/4" copper water service then you should maintain that throughout the house (as the primary material and size) including into and out of the water heater.
When you get to fitting tees for the several fixture you can reduce to 1/2" for most.
I am installing a new shower system...
The shower will have a rain shower, two hand helds and 4 body wash jets - so will pull quite a bit of water... Any thoughts?
Mostly that it seems a silly and wasteful indulgence. As to the plumbing work needed... whatever size fittings the MIXING VALVE calls for is what I'd connect to it.