vaillant ecotec plus vuw 26cs/1-5

Hey guys. I am in a bit of a pickle, mostly because what I want is not considered "conventional" in the country I live in, so I have a hard time getting the advice I need. I have a " VAILLANT ecoTEC plus VUW 26CS/1-5, 21 kW" boiler + "sensoCOMFORT VRC 720F" combo fitted to work with my UFH of a...