Here is a driver to monitor EMS (Energy Management System) compatible boilers from manufacturers such as Bosch, Buderus, Nefit, Junkers, Worcester, Sieger, elm.leblanc and iVT.
These systems are quite popular in Europe, not sure about their spread in the rest of the world.
You will need either an off-the-shelf EMS Gateway, or a DIY project, to do the actual talking to the boiler (EMS bus), and provide the extracted data to Hubitat.
Communication between Hubitat and the EMS Gateway is done with REST API calls (polling) over Wi-Fi/LAN (local, no cloud nonsense). The gateway also supports MQTT, but I opted to use the REST API approach for this driver.
Example WT Dashboard with boiler data:
More information and setup instructions are documented here:
Have fun!
