Thanks SensibleHeat. Any suggestions to do what I want i.e switch on/off rooms within the heating program without the user having to edit the program? Only 2 ways I can think of are either the web interface you sell to hometronic that would allow a computer to upload a new time program with each room included/excluded based on a set of user switches, or physical zone valves under separate control to isolate parts of the system and therefore effectively starve those HR80s of heat. In the latter case would presumably need to disable the optimum start as the system would get confused with heat sometimes being unavailable.

Anyone know if honeywell are planning a web or pc interface for evotouch? There is a promising looking USB socket and the mention of PC connection in the evotouch description.