Guys I would like to section out the central heating in my house Currently when a put central heating on the whole house comes on even the conservatory underfloor heating. I have been told i require a S plan heating system where i put 2 port valves in. I want to have 3 zones. 1 upstairs, 1 downstairs and 1 for conservatory. I already have one 2 port valve which has like a thermostat coming out from But when i turn that thermostat off central heating doesn't come on. What i want to know is what material will a need to do the S plan system. Will i need to open floor boards and play about with them . Or can it be all done from like my garage where all pipework runs from? I have attached a few pictures for clarity, this is only for me conservatory underfloor heating. I only have one thermostat controls all house.