I just can't see a reason, why I would need to control anything in our (Viessmann) heating system we have, from within the Orbiter, that's all. I come from the point of view, that a heating system is setup once, fine tuned, and left alone.
If you want to chart temperatures, you can utilized the KNX gate. I found Vitogate to be too expensive for what it can do. For example, you can't even set the outside temperature, iirc. Which is stupid, when you think about it. Lots of systems in the house need the outside temp. Why can't I write the outside temp via KNX into the Viessmann system?!