Gas with solar thermal? Or heat pump with photovoltaics? Consultation

There is a special forum (Photovoltaik ... Forum ... de), where this is discussed a lot, often enough also the purpose of photovoltaics + battery storage

If I may summarize what I understand to be the consensus there:

If photovoltaics, then full roof and without storage (especially storage with heat pump and underfloor heating makes little sense because heat pump and underfloor heating are the storage for photovoltaics (only makes little sense economically!)

Nevertheless, there are exceptions that can make a battery storage "sensible":

• Ecology -> questionable (but I believe in it)
• Autonomy -> clear
• with subsidy -> economically better than without subsidy (clear), especially long term (>20 years, if the battery lasts longer than 10-15 years (nobody really knows this)

P.S. We’ll probably fill our roof -> approx. 23-25KWp + 10-15KWh battery storage, brine-water heat pump, underfloor heating (also for cooling), controlled residential ventilation. But for us: 4 small heat generators, KfW40+ = subsidy for almost everything ...

We are building a new single-family house and are also looking at the differentiated options regarding heating and air conditioning. Unfortunately, there is no gas connection on the street, which is why some houses have installed or buried a gas tank underground. In principle, I like innovation, but with this topic, I also feel that heat pumps are too much in focus and that the efficiency of condensing technology today is not recognized. In addition, we like to keep things simple and convenient when it comes to heating. We will have very large glass surfaces and might install sun protection glass on the south side, along with external venetian blinds. Nevertheless, I am having the necessary pipe connections/outlets, etc., prepared so that an air conditioning unit or air-to-water heat pump can be installed later without any effort. Therefore, my question is whether you would also support this position with liquefied gas? Our property is very large, a gas tank (underground) is no problem, or does that only apply to a "normal" gas connection? What should I consider during the shell construction so that I can easily integrate an air conditioning system/air-to-air heat pump later if needed? Do I have to mandatorily install solar components on the roof for gas when building a new house?

The condensing technology is nowadays mature and as efficient as it can be. It is also reliable enough that you can practically hit the boiler with a hammer and it will still keep running.

But...

Of course, you have to consider all costs, and if a gas connection is not possible, the scale tends to tip more towards a heat pump.

Here, you really have to calculate everything with a very sharp pencil. Liquid gas tank and gas deliveries – these are all costs that come on top. It might be cheaper to install a heat pump with a trench collector right away.

Regarding heat pumps for cooling: you have to come up with a concept of which technology you want/need.

Quick and easy is with air heat pumps; then you only have to prepare the refrigerant lines, 5x1.5 cables from outside to inside, and ensure condensate drainage at the spots where the indoor units are to be installed.

Follow up:
Dear people, also, or even especially, because of the suggestions in this forum, I have now decided against an air-water heat pump and in favor of a condensing gas boiler in combination with solar thermal for domestic hot water heating.

Greetings to everyone who supported me in my decision-making!

Condensing boiler technology is nowadays mature and as efficient as it can be. It is also all reliable enough that you can practically hit the boiler with a hammer and it will still keep running.

But...

Of course, you have to consider all costs, and if a gas connection is not possible, the scale tends to tip more towards a heat pump.

You really have to calculate everything with a very sharp pencil. Liquid gas tank and gas deliveries - these are all costs that come on top. It might be cheaper to install a heat pump with a trench collector directly.

Regarding heat pumps for cooling: you have to come up with a concept for which technology you want/need.

Quick and easy is with air heat pumps; then you only have to prepare the refrigerant lines, 5x1.5 cables from outside to inside, and ensure condensate drainage at the places where the indoor units are installed.

Hello,

we are still "at" the very beginning and first collecting ideas...
Is the gas condensing boiler with solar thermal used only for hot water or also for underfloor heating?
Then I need 2 tanks, right?
What is common... I also read that it is used only for hot water, i.e., for showering, etc...

Thanks for the answer

What is common.. I have also read that it is only used for hot water, like for showering etc...

That is common and it contains the nonsense that you have plenty of hot water in summer, but rather not in winter.