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NotThamesWater
stevo_com
I DIYed the whole thing. I really liked the instructions in the app. They show you wire by wire what to swap over to where and provide idiot proof labels to use. I replaced the wired hallway thermostat first and then the controller to be able to control hot water.
I have smart TRVs in most rooms. Started with a couple and then just added more over time. It is advisable to have at least one rad with standard, non TRV valves so that if the general thermostat calls for heat, it is not pushing against shut valves. Most systems should have a loop built in to prevent this happening though. We have the rad in the hallway, kitchen and the towel rail in the bathroom on dumb valves. So if anything else calls for heat, those all heat up. I may add one to the hallway rad when it gets replaced, but I'm not touching it until then. Ditto for the kitchen.
As for extra sensors, no, I did not. In Tado, you can configure a + or - offset for each TRV if you feel it is missing or overshooting the temp in a room. I keep meaning to do this properly by putting a thermometer in the main space of each room and fettle each offset accordingly. But in reality, I just bump the temp manually if I feel it's a bit chilly.
I keep sounding like a Tado fanboi, but I've not tried any of the others (I had a Hive thermostat only in the last flat, which I liked). I'm happy enough with Tado to recommend it, but couldn't say if it is better or worse than the others. My Hive setup didn't have TRVs so I can't compare there. Tado now offer black or white devices, if that's important to you.