Check if Domoticz accepts new devices ("accept new hardware"). Not for just 5 minutes. Save and restart domoticz.

With the help of jeedom I figured out which codes you should use to control the stove.

Manual for a linux box, in outline:
1. find out the code for your stove with the rfxcom windows software.
2. Install the jpnevulator package (sudo apt install jpnevulator). This allows you to write codes to your ...