Heat pumps require a lot of energy and make noise

4h for hot water to reach 48°C is not normal, unless you have -18°C AT and only a 2kw heat pump.
Does the Wilopump itself make the noises? So are they just transmitted noises?
What else is installed before the HKV as a possible source of noise?

The Wilopump makes the main noise from the pump, whether it only transmits it I cannot say, but there are other noises at the HKV than at the Wilopump. Nothing special is installed, just a pressure vessel and the usual stuff, I am not that familiar with the matter.
The pump is only responsible for heating and the hot water is heated by a different mechanism? Is the heat pump possibly set incorrectly or why does it take so long?

Hello everyone,

in the meantime, my consumption has settled at about 13 kWh per day, I have set all the valves in the rooms (thermostats) to 30 and it runs well like that. The problem with the noise had improved after we always turned it down at night. But recently it has become extremely loud even at night, and that despite the fact that the Wilo pump is running at the lowest setting. When I adjust it, you can hear it like a creek running next to you.
The Bosch technician is unfortunately still nowhere to be seen, today I asked again and suddenly they say they are waiting for a new compressor. I just wonder how they come to the conclusion that they want to replace the compressor right away. That is certainly not the cause. They are now clarifying where that information comes from.
Even when the heat pump is off, the noises continue. Maybe installing a bypass valve after all? My heating engineer didn’t want to know anything about that..
Are there even other settings in the pump so that the technician can do something at all or does the Wilo pump do everything?