We have a few water leaks, (plumbing), and rather that repair them we decided to replace the lines with
PEX.(Yes the PO's or the PPO's let the system freeze. The pipes expanded until they burst) It appears that the supply to the water heater as well as the
cold supply to the faucets is 1/2". The
hot appears to be the 3/8". I am considering using 5/8 for the supply, with 3/8" taps for the faucets and 1/2 for the
hot with 3/8 taps for the faucets.
The service manual is vague on this info.
Ideas greatly appreciated
Dave