Heat pumps require a lot of energy and make noise

At such low flow rates, it is absolutely silent here. Can you describe the noise a bit more precisely or even record or measure it? Is it caused by all circuits or only some? So can the noise be eliminated by shutting off individual circuits completely?

Yes, if I turn all the flows to 0 or turn them down, it gets quieter. When I turn the red or blue shut-off valve, everything is quiet as well. So the problem must be somewhere there. I can try, but you won’t hear much. It is a consistent flowing noise, it reminds me of radiators in my parents' house, they also make those noises when water flows in and it heats up. So it is rather the opposite of what everyone here says, the more I open, the louder it gets.

So it is rather the opposite of what everyone here says, the more I open it, the louder it gets.

What flow rate does the heat pump produce?

Have you ever looked at what happens when you try to bleed [the system]?

Hi,
Are both HKV affected?

Bleeding has been done several times. At first, I thought it was only at the top, but now I know it can also be heard at the bottom since I opened several valves on your advice. The technical room and corridor were closed. However, it is definitely louder at the top. Where can I see what flow rate the heat pump is producing?

Nothing can be heard at acquaintances' places, but they have such a bypass valve. Also new construction.