do you think the chimney connection is better like this? Or the old version? In the old version, we had the problem in winter that the temperature in the buffer did not rise, but it was barely bearable in the living room. That's why we wanted this modification.
Phew, good question, I know much more about heat pumps than about fireplaces. I'm not a big fan of it either. Today we were also annoyed by the neighbors who filled everything here with smoke... Basically, I think the connection was better before than now. But the real question is, as Mycraft already said, how the underfloor heating is connected. And above all, did you have all the room controllers set to 1 there? You should be aware that as soon as the temperature on those is exceeded, they completely close the flow. So that's not regulation but an on/off. How then is the heat from the fireplace supposed to be transported to other rooms? The energy performance certificate has been mandatory since 2002, hasn't it?!