Heating question new building KFW 70 air heat pump + solar, ice storage?

Thanks for the answers.

How is it with the hot water? Since heat pumps are best suited for small temperature differences? If hot water is then to be heated to 60 degrees in winter, doesn't that require quite a lot of electricity?

How about the combination of air-to-water heat pump + photovoltaic? Probably not worthwhile either, right?

With "heat pump users" in the single-family house sector, you'll hardly find anyone with 60-degree hot water - more likely in the range of 45-50 degrees. Of course, there should be sufficient throughput - meaning the storage tank fills up regularly (topic of legionella).

With photovoltaics, it's a similar situation. High self-consumption in practice is not possible without a battery storage - and weak yield in winter. With a third-party financed photovoltaic system including interest, insurance, repairs, reserves, etc., it is certainly no longer profitable (economically).

Cf.:

If I'm not completely wrong, the 60 degrees are only provided by heat pumps intended for old buildings to still bring normal radiators up to temperature, right? For normal underfloor heating, as mentioned, the water should be at 40-50 degrees. My info so far.

...with underfloor heating in new buildings or comparably renovated existing buildings rather a maximum of 35 degrees at extreme minus temperatures...

As far as I can read here, an air-water heat pump alone would be sufficient and most economical for underfloor heating and hot water without combination, right?

There are also 2 variants here, one is the compact version and the other is the split version. Which one is recommended here (regarding noise development and efficiency)?

Does it make sense to install a ventilation system with heat recovery as well?

Thank you very much for your help!

A ventilation system with heat recovery is always useful in modern new buildings, regardless of the heating method...

There are already many articles about controlled residential ventilation WITH heat recovery. Just make some effort and search the forums. The general consensus is roughly: not absolutely necessary (but who really ventilates properly by hand), probably never economical - but an enormous gain in comfort.