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Lets say you got a combi, do you need 2 room stats (one upstairs and one downstairs if so where upstairs would you situate the room stat?) and a 1 channel programmer?
rodders the reason they want to have the heating spilt up into the two zone it that there is some energy savings to be gained if the heating in the sleeping areas (bedrooms) of the house can be turned off when no body in these areas, which makes sense if you think about how most people use there houses (bedrooms only need heating when we get up & then again when we go to bed) (unless you want a quickly in the afternoon, ar' they were the days !) sorry, day dreaming again !! anyway this means that you do need time control as well as temp (part L does state this) the easy way to achieve this is to use a programmable room thermostat upstairs controlling a zone valve. You can do the same downstairs as well, easer to link these to 2 ports rather than a 3 port.
Do you know how a 2 port valve works with the micro switch ???