(why not buy something supported by an app 
)
Oki, Vincent,
How did you check if your valve controller is or isn’t supported by the Tuya Zigbee app?
Here’s the instructions.
These models are supported, it can be Tuya or whitelabels like Nedis:
In theory:
When you’re in a hurry, buy a Lidl zigbee hub, connect it to Tuya or Smart life phone app, pair the thermostat knob with it, and install Tuya Cloud app (but, this obviously uses the cloud).
This way you’ll be able to control it, and send data / commands to Homey.
When you can’t add it as device, you can use this workaround
