We've got a Drayton LP522 heating/hot water controller, plus two zone valves (with old mechanical thermostat dials) on our current system. In a couple of months I'll be decorating the utility room where the heating controls are, so I'm considering upgrading the system to one of the new smart heating ones.\n\nIdeally, I'd like a system that will make use of the existing wiring - I don't think that wireless controls would work between the two zone thermostats. From what I can tell, there is a new Drayton smart heating system - but it's very basic and doesn't have smart TRVs available. The Tado looks like it can re-use the wiring and also has smart TRVs available, but it looks like it's more confusing when there are 2 heating zones and hot water to control.\n\nHave any of you guys gone for Hive/Tado/Nest/Evohome, etc...? If so, what are you thoughts?