The ony line I would connect up to hard water would be the outside faucet, you do not want rust stains in the toilet and in the ice.
Using 3/4 for all your main runs will have no bad effects, and will increase the avalible flow.
Why copper and not Pex? Cheaper, a whole lot faster to install, far less fittings used, less likly to burst if it freezes.
Using 3/4 for all your main runs will have no bad effects, and will increase the avalible flow.
Why copper and not Pex? Cheaper, a whole lot faster to install, far less fittings used, less likly to burst if it freezes.