Thats what i am after but i dont think 2 port valves will do what i envisage. When i fitted my central heating in 1980 my neighbour drew up the plan. I think it was called a Y plan. But i have now replaced the boiler with a Combi Boiler.if you want individual arias to control the boiler you need zone valves. its called s plan . some wiring involved thermostats and a couple of 2 port zone valves. an extra time controller if needed