Bought a foreclosure house that was not winterized properly, so I have no idea how well the water lines originally worked. What I am doing is running new pex to most of the fixtures. This is a 900 square foot cottage. Will have washer, one full bath, kitchen sink, dishwasher and fridge water line. Installed a new water pump and pressure tank on the inch and a quarter well. I put a hose attachment on so I could get water while working on the house. I get about 6 gallons per minute.
The original lines are 1/2 inch copper to the pump and then 3/8 inch copper to new cpvc 1/2 inch. My question is: I would like to attach 3/4 inch pex to the 3/8 inch copper as a main trunk line and then branch off with 1/2 inch pex. Can I do this? I cannot replace the 3/8 inch copper to anything larger. Or do I run everything in 1/2 inch pex?
Thanks for any support.