Heat pump flow temperature experiences?

No, we do not have a separate meter for the heat pump. That makes things a bit more difficult.

No, none of us work in shifts. No one showers at night. I will now try to optimize the preparation times a bit.

In any case, the frequent hot water preparation is very costly. Otherwise, a valve might not close properly, so that some heat from the hot water gets into the heating circuit, which was the case with us (with a new heating system, manufacturing defect in the valve). The customer service then replaced it and everything was fine. You should keep an eye on whether the supply line gets warmer during hot water preparation, possibly measure it yourself. For us, it was also noticeably too warm at the heating circuit distributor, for example. Otherwise, I find the supply line at 10 degrees overall too high; for us, it is about 22 degrees.