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Evohome looks an impressive system but only works with modern condensing boilers it seems. I was looking for a simple fix to extend the life of my present system: not a full replacement system at present.

I have a gas fired central heating system with, what was pretty state of the art, Honeywell AQ6000 controler when installed in 1992. The system has worked well for many years but the rotary mixer valve V5069D seems to have become too stiff to move by the actuator M676C and the plastic arm that...