Heat pumps require a lot of energy and make noise

I do not assume 22 degrees, but 30 degrees at the thermostat in the different rooms. My thought was that the compressor then constantly tries to reach the 30 degrees, which is not possible with this heating curve. Or is the "optimized temperature" that can be set on the device the specification or maximum up to which the machine heats? If this is the case, where is the temperature measured? On the device itself? So in the technical room, where it is usually cooler anyway? Compress 6800i AW from Bosch is the heat pump. Is only a Kfw 55 standard with masonry 36 bricks without additional insulation. So no greenhouse. The auxiliary heater is permanently off. Heating curve at 28 base point and 35 end point. Max. 45 degrees flow. The noise definitely comes from the HKV and sounds like a radiator in my parents' house when water flows through it

I have two HKVs and no matter how the HK pump is adjusted, I cannot detect any flow noises, no matter how I set the thermostats (all open, only one per HKV, etc.). There are also bypasses built into the HKVs in my system (I think that is called "overflow valve"?) (where on your system the two "empty" connections are on the far left).

My heating engineer said that this "overflow valve" probably prevents flow noises.

There must be a point somewhere where the heating says, okay, I have reached the target and can now switch off. Otherwise, the thing runs continuously, right?