Which heat pump to use in monolithic construction?

I really had to laugh when I read the text of the TEs. Where did you get that from? Basically, I also started the air-to-water heat pump topic with prejudices. My prejudice was that the outdoor unit tends to ice up in winter and then you have to live without heating for 1-2 weeks or run the electric heating rod until a technician arrives. We had the heating rod proactively disabled by setting for water and heating in case of a possible malfunction of the outdoor unit. Our construction coordinator specified the air-to-water heat pump for us; in his housing projects, he only installs the Alpha Innotec 70 "something". He said he has the least trouble with it, so we chose it.

The underfloor heating has been running without problems for 1 month now, well, winter is still ahead, but just in case, we still have the fireplace.

On the subject of monolithic, air-to-water heat pump, photovoltaics, geothermal exchanger, and centrally controlled residential ventilation, I can say from my own experience that it’s a good combination.
The meter was installed on 21.07 and since then we have consumed 13xx kWh and produced 28xx kWh (140 sqm living space & 70 sqm basement).

The system is 8.7 kWp large, still without storage (that will follow at the end of February). No idea if that’s a lot. I have a purely electric car which I mostly charge at home and drive 70 km daily. Just to put all these values into perspective.

There is no gas connection, maybe that was overlooked. The discussion only makes sense if the gas tank is taken into account.

If a lot of snow and cold are expected in the region, one should consider geothermal energy instead of an air-to-water heat pump. So trench collector or, if necessary, the more expensive drilling, then the outdoor unit is no longer needed.

My prejudice was that the outdoor unit tends to freeze in winter and then you have to live without heating or with electric heating rods for 1-2 weeks until a technician comes

Very brave to put such a thing on the house anyway

8.7 kWp large, still without storage (that will follow at the end of February).

Didn't you recently refer to calculations showing that photovoltaic storage systems don't pay off? What caused the change of heart?

Very brave to still put such a box on the house

Didn't you recently refer to calculations here according to which photovoltaic storage systems are not worthwhile? What caused the change of mind?

That's true. But I still have plenty of budget left. That should be used up.

I did not expect any other answer

Specifically: Our children live in a monolithic Energy Saving Ordinance house, 30s Ytong plastered, and heat it with an FHZ and Junkers air-water heat pump. After initial adjustment problems, it now runs smoothly and at costs that per square meter correspond to ours; we heat the same house style with gas. (6.00 euros per sqm and year energy costs, for them electricity, for us electricity and gas) Controlled residential ventilation is not necessary. The houses are ventilated through regelAir slots and exhaust via exhaust fans in the bathroom from Maico or similar.