I'm building a house that's "L" shaped with 3 bedrooms at the end of one leg of the "L" and a kitchen/half bath/Laundry in the other leg. My plan was to put the water heater right near the kitchen/half bath/laundry area so that they would get hot water pretty quickly and run a grundfos recirculation pump with a dedicated return line from the farthest bathroom. Since the house is an "L" shape the distance from the water heater to the farthest bathroom is about 100'. I'm using 3/4" pex for main line connected to manifolds with 1/2" pex running to each fixture. Is 100' ok for that main line or will I have a problem with the water cooling down by the time it gets there?