Thoroughly inspected by Toby.
The smart radiator thermostat from Tado doesn't work with all brands of radiator valves. Check beforehand which brand of thermostat dial you have. The radiator button from Tado is suitable for faucets from Caleffi, Comap, Danfoss, Giacomini, Herz, Olymp, Siemens, and Terrier.
Don't have a boiler, but do you have radiators? If so, the Tado Smart Radiator Knob + Starter Kit V3+ is a good option for you. The package has a smart radiator knob and the Tado bridge. Place a radiator knob on each radiator and you can control them individually with the app on your smartphone (iOS and Android). Connect the included bridge to your router. This connects your smart radiator knob to the internet which means you can control the thermostat from a distance with the app. Apart from being able to control the radiators from a distance, you also save energy and heating costs. You can never accidentally leave on your radiator anymore.