Hi    Sorry if this has already been responded to as it must be an obvious question and indeed I have read a few discussion which are somehow related.   Self build house, two floors, both will have UFH. House is well insulated and will have MVHR therefore I am guessing most of the house will be roughly the same temperature.   Question is, to manage pressure drop, max pipe lengths, etc, I will have multiple ufh zones on each floor and one manifold per floor, and henc