Cost Breakdown Heat Pump - Heat Pump with Ground Collectors

Yes, quieter - you can see that from the values per model.

For us, it's in the basement - once again an advantage of the same.

Although 42dB is very quiet...

How is it actually with passive cooling – according to my understanding, this should also regenerate the borehole to some extent, shouldn't it? And another question: Our heating engineer now says he wants to connect an 8 kW heater to the 6 kW borehole – is that sensible? I wouldn’t be afraid of freezing since the maximum demand is about ~6 kW – the COP of the 8 kW heater is also almost the same. Then is it just the slightly higher acquisition costs, or what speaks against doing that?

I can't tell you - our heating system and the borehole were chosen together. The heating system can actively cool. But the heating system would deliver 8kW because it cannot modulate. Why don't you take 5kW with a 6kW heating load?

Is your network operator allowed to cut off your heat pump electricity? Then the 8kW definitely make sense to partially compensate for the gap.

What do you want to regenerate at the source? Especially in winter? Nothing is regenerated through cooling because there is no cooling. And the summer/winter change can probably be neglected or only has a short-term effect.

No, the pump is to be connected to the household electricity with a submeter. Cooling in summer - brine temperatures at boreholes also drop by about ~1-2 ° in the long term, that was what it was about.

And why should it be like that? Heat pump electricity is indeed subsidized. But then an 8kW pump doesn't make sense, or is the 6kW only heating demand? There is also hot water (without solar) to consider.