In order to give any heat at all, the temperature of the water must drop trough the loop, that is the only way to get energy from the heated water. If you place the loop as I said, there will more energy released along the outer wall. Browse back in this thread and see AC_hackers pictures if you need to see it visually. Radiators demand a lot higher water temperature, and you will then need separate circuits. Also, heat pumps are less efficient at higher output temperatures. If your floor heating cannot keep a good temperature along the walls and under windows, you would be beyer off by increasing your insulation, and getting better windows.
|