I am replacing the 60 year old copper plumbing in a ranch home and want to switch to Pex tubing. My plan is to run from the water meter to a manifold . Output of the manifold will be all 1/2 pex lines that will run to each area of demand. I have seen this set up referred to as "home run" manifolds. My question is the input to the home / water meter is 1" copper. On the output of the meter I will switch to Pex. All the manifolds I see are 1" copper with 3/4 pex fitting as the input. So is there any advantage to maintaining the 1" size from the meter to the manifold since the input fitting is 3/4. I'm not sure I will be taking advantage of the 1" pipe if it gets reduced to 3/4 at the manifold input. I have the same question on the hot water manifold. Do I come out of the indirect hot water tank with 1" or 3/4 to the manifold? Any help would be appreciated!