Three Designs for PEX Plumbing Systems – Fine Homebuilding – Incorporating manifolds into the layout can save water and energy because you eliminate most of the pipe between the water heater and the faucet. … Take advantage of the many features of this versatile line including easy manifold mounted design, integrated circuitry … together with a simple piping system that eases assembly and plumbing, resulting in reduced labor costs, errors in installation …