Roth heat pump single-family house setting / optimization

how are your current electricity consumptions?

And on the topic: Google forum posts about your heat pump type and unfortunately you will see that many other builders have your problems as well. Real help, as DanielSP already wrote, only comes from a conversion.

HK3 Dining room: AZ 15cm, 125.2 m; 17m², 1.6 l/min, 20 degrees HK4 Living room: AZ 15cm, 124.1 m; 18m², 1.6 l/min, 20 degrees

AZ = laying distance? That is quite generous with 15 cm and 20 cm. The bathroom with 10 cm is actually also too large. Therefore, you mandatorily have to run slightly higher temperatures -> heating curve/room setpoint if it should get warm. The heating circuit lengths with >100 m are also suboptimal. For rooms from about 17 sqm, we have two heating circuits.

Yes, exactly AZ is the installation distance. Downstairs on the ground floor I have no problems reaching the temperatures, or rather I don’t need 24 degrees in the downstairs bathroom either. Upstairs it’s a bit more difficult with the temperatures...

Currently I have the heating curve set at 27.5 / 23 / 0. For the ground floor I could manage with a little less but then the children’s rooms would be around 21 degrees which my better half decided is too cool.

Upstairs in the bathroom I get about 22.5, children’s rooms 21.5 and office 20.5. That’s because the flow rates upstairs are not that high, right?

Downstairs in the living/dining area I comfortably reach 23 degrees or rather it’s warmer downstairs which is supposed to be the case...