Has anyone experience with Homematic and heater-controller?

[kuema]

If I remember correctly, these are wireless and are using the 868 MHz band. I think they can be controlled with a CUL adapter.

We had a similar discussion some days ago, maybe you can find some hints there.

Wmbus cul node red

Experiences with CUL yes, but not in conjunction with Node-RED. I use this CUL adapter with this firmware in FHEM to control/read my heating thermostats. At the moment I push the data from FHEM to Node-RED via MQTT. I haven't had the time to integrate it directly into my Node-RED instance, yet. There are custom nodes for CUL and WMBUS.