If he's planning on running a buffer/accumulator then it's ideal for UFH, you pipe up the flow and return to the buffer the opposite way to normal I.E flow at the top of the tank and return at the bottom. This way causes stratification and you essentially have bands of different temperature water from top to bottom as the cooler water sinks down. Then you can just connect in your zones (DHW, heating, UFH etc) as necessary to the outlets in the appropriate temperature band