What flow temperatures are you currently running?

Sure, but to my knowledge, the installers prefer Zewotherm and one could take a look at the documentation of the installed goods, couldn't one?

Just for fun, I set the minimum heating circuit temperature/flow temperature to 23°C, and it was immediately displayed as the target flow temperature. I'm curious whether the heat pump controller will maintain this until more than 23°C is required according to the heating curve. If that is the case, it would basically just be a base point increase (and not a parallel shift that raises the entire heating curve, as it would if done via the desired temperature).

You mentioned Zewotherm, may I ask which heat pump you have? A Zewotherm heat pump was also installed here. It is from Fujitsu. The HKVs are from Strawa

My heating engineer installs ventilation systems and HKVs from Zewotherm. Heat pumps from Daikin and Vaillant. So, apparently, we don't have a match there. ;)

My heating engineer installs ventilation systems and HKVs from Zewotherm. Heat pumps from Daikin and Vaillant. So apparently we don't have a match there. ;)

Well then :-D there probably aren't that many with the Fujitsu heat pump

I now have my heating curve set to 0.2, all rooms with a 1l flow rate warm up to about 21-22°C which is great, however the guest WC is only 20°C with a 3l flow rate and the bathroom just barely reaches 21°C also at 3l flow rate. The bathroom is too cold for my girlfriend so the heating curve needs to be higher