Hi!
I am looking for a switch which looks like this.
Interface doesn’t really matter(Wifi, Zigbee,…). It must only act as an input device, it must not be an actor itself.
Any suggestions?
Do you want a wired solution or wireless?
Wireless.
And i forgot to say, i do have 230V at the place where it should be mounted.
Oh, okay.
That eliminates anything I would suggest.
I’m sure other people will suggest options.
Good luck 
Curve ball suggestion.
How about a small touch screen, with a temperature sensor (built-in or external)?
I doubt you’ll find such a specific device.
If it needs to be “compact” … maybe Homematic HM-PB-4Dis-WM-2?
If you could use KNX, then there are devices like this, but that is not wireless and you can´t use 230V.
Examples:
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