I have setup different thermal zones in a residential building, now in order to be able to see what different temperature schedules in different zones have as an effect on the heating demand, I think I have to set up a heating system. The closest system to European based systems is a low temperature radiant system with a hotwater boiler, at least as far as I know. Does anyone have a working osm file that he/she is willing to share, so I can work and learn from that, because the system I'm trying is full of errors. The model of the building is fine, all zones and spaces are setup well and surfaces are matched.