go ahead. Your thinking is clear. You currently have Pex in a branch and tee set up with bends (elbows and tees) "and couplings everywhere".Originally Posted by Daniel S
Use a 3/4" home run for your soaker tub. You can use that size everywhere else too; it does help.
There is a maximum flow possible from a 1/2" pipe (or any pipe), but your plan is initially to let the water enter the house and reduce further friction losses after that point. Sounds like a plan!
Then, later, independently, you can increase the entry pipe size if you want even more. You may be fine without; you'll know when you're finished Step 1. Here is a trick question you can ask that plumber and others: what is the difference in flow, if you have a pipe made of two parts of two different diameters, when you reverse the flow? Does water flow more through the pipe when the bigger diameter is the first part? Or vice versa?
Pex at 1/2" (nominal) is a lot smaller than copper at 1/2" (nominal). Real inside diameter (I.D.) of a 1/2" copper pipe is halfway to the I.D. of a 3/4" Pex pipe, or put the other way around, a 3/4" Pex pipe is nowhere near as big as a 3/4" copper pipe.
I have 3/4" copper coming in, and 1" Pex-Al-Pex indoors.