Hi Guys, I have received my plans for the UFH which I am installing myself ( with the help of a plumber mate) but the plan shows feed and returns to the six zones very close together and I would think they should be separated to stop heat transfer. What distance would be sensible to stop heat short circuiting from the flow to the return?.  Also I plan to put the feed and return to the manifold from the ASHP between the EPS sheets in the floor insulation, I know electric cable can be affected by