Hi, We are currently in the process of self building, and have got UFH designed on all three floors.   GF is living kitchen dine (all open ) + utility + guest FF is 3 bedrooms and 2 bathrooms SF is gym only   My question relates to UFH on FF and SF. Do I go for separate manifolds with piping and pumps on those two floors, or can they share one manifold? Gym only adds 22m2 so around so less than 200m with flow and return (i.e. 2 ports / valves / zones / whicheve