2 weeks ago I had to replace my heating. I have chosen the Remeha Calenta which supports Opentherm. I am now in the proces of building an interface into the system. Specifics can be found here http://tclcode.com/opentherm/
. When finished I want to see if this interface (rs232) can be hooked into Linuxmce by using GSD. This topic is to inform anybody interested. I will document the final setup on the wiki.