hi all , i will try not to ramble on .... so im about to attempt to install a underfloor heating system in my kitchen ... i plan to do this by taking a flow and return from my existing condensing boiler (that is situated also in the kitchen) . im looking at purchasing a single room system that includes thermostatic blending valve and pump. from the information i have obtained i understand that the best way to control my heating system is to do away with my original central heating timer and purchase a programable room thermostat (jgprte) and control my original heating system and underfloor heating with this unit. what im not sure about is do i need to fit a zone valve (s) ? and if so where abouts and how are they controlled , the existing boiler already has a by pass valve fitted so that seems to be taken care of . as im sure you can imagine im new to the world of underfloor heating so any help/advice to explain and would be much appreciated