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I have Tado. It's mostly been trouble free. I had a problem with one TRV not turning off which after I opened a support ticket and went through the motions they sent a replacement.
I have lots of TRVs so lots of batteries to change every 9-12 months but it gives me the control I want, for example the guest room is currently set to very low but I can turn it up when someone is staying.
I'm using the WebKit HomeAssistant integration to control some things. That is local to my LAN, everything else needs the Tado cloud. I mostly use the app though as it is easier.
I believe fancy boilers and heat pumps can be communicated with using some sort of serial bus rather than relays. There are terminals on the Tado for that but I have no experience as my boiler is about 40 years old.
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Not as popular, but I have a Netatmo. Works nicely with Home Assistant, easy to install, the app is pretty straightforward (and also has a good browser interface), no subscription, easy to get your data and I've had no issues I can remember in the ten yers I've had one. You can often pick them up for cheap on ebay.
They're not as well known but they're owned by LeGrand who do that kind of stuff for industry.
A controversial view on here but I wouldn't necessarily go with smart thermostats. Apart from the aesthetic issues, when I looked at them the payback period was very long. There's also the issue whether trying to heat individual rooms using central heating is the most efficient way of doing it.
Smart thermostats. I’ve gone back through the thread and both Hive and Tado seem to be the recommended options - that still the case?
I’m finally going to replace our old analogue one that controls a condensing boiler that serves the heating and feeds a hot water tank. Moving forward this vented tank will be replaced with an unvented system and eventually a heat pump will replace the boiler. I plan to put smart TRVs on the radiators too.
Lastly, I want it to work nicely with Home Assistant.
Any likely issues with either Hive or Tado in this case?
Thanks