Nothing is easy. I had to compromise with Quicksilver and place the hot water heater between galley and bedroom. Center of 38' / 2 / 2 roughly 9' of insulated pipe counting zags and zigs.
Perhaps someone can explain this and help me understand. A recirculation system that recycles water through the cold water system is a loop is it not? Basically heating the cold water? Something has to flow, somewhere.
And do not Shur Flo and other pumps have non return valves?
A return to fresh water tank is easy to understand. It's the closed-loop description here that puzzles me.
Can pipe wrap element heating be used if temperatures are to exceed 100F? I saw a thousand watt under sink heater on a sailboat long ago but I have no idea if they are still available and or cost less than an airplane.