hi sorry if this has been asked before i tried searching but couldnt find anything. I want to replace my trv's with programmable ones so that I can controll the temperature in individual rooms at different times of the day etc. currently i have a timer / programer in the kitchen that I can set when the entire system is powered up. and a room thermostat in the hall that has the ability to turn the entire system on and off. I want to install the programmable trv's and then have the central heating system turn itself on and off when the programmable trv's open the valves to heat the room. my system has a separate boler and pump, the boiler is also set-up to heat the hot water. my thought was to use the power input from the room thermostat in the hall and replace it with the pressure swith output. does anyone know if this is possible and whre i might find this type of valve.?