On the other hand - I've had a Hive thermostat for the last 5 years and it works flawlessly. Every time I start it from the app it works. Use it with a combi bo

On the other hand - I've had a Hive thermostat for the last 5 years and it works flawlessly. Every time I start it from the app it works. Use it with a combi boiler here in UK and it works absolutely fine. I only have that one device from them so I can't comment on anything other than heating.