I'm replacing the copper in my house with PEX tubing and I'd like to set up my new utility room with hot water and cold water manifolds. Each connection on the manifold would then lead to either hot or cold on a plumbing fixture and I'd have shutoff valves to each at the manifold.
I recalled hearing somewhere that each manifold should consist of a circular loop; that is, the manifold should not terminate directly, but should contain a connection to circulate water back to the inflow of the manifold. I'm not sure why this should happen, or if it should happen.
Don't know whether it matters, but I'm on well water.