boiler thermostat install wiring

Hi I bought MH1823 TuYa Smart Wifi Thermostat and i'm wondering how to connect it to my boiler. Current thermostat wiring: Vitopend schema: I didnt check the cables inside the boiler, i'm not a professional just wondering if its possible. My current thermostat has only No and COM cables...

The thermostat is no longer working correctly as it puts the heating on regardless of what we set the temperature to and we want to uninstall it and return to using the boiler thermostat instead. How do we do this please?

Hi all. This is a very specific question which feel sure should be answered somewhere, but I have been unable to find it, so please excuse any redundancy. The situation is that I have a Volkera 25 compact boiler, the manual to which can be found at...