Current installation costs of a heat pump

Why? To get away from oil. Solar thermal can be dropped. There is already a circuit with a buffer tank (@TE: that's the case, right?). You can easily integrate a heat pump there. Yes, it may "cost" an additional controller.

No one offered to continue using the old tank in my case. There were many arguments. Warranty denial, too much scaling, etc.

Arguments were many.

Arguments or pseudo-arguments to sell you more? It's a rhetorical question.

I feel increasingly uneasy about the global and political developments with oil and am concerned that it will eventually become financially untenable.

Just replace oil with electricity in your statement. The same now applies to the electricity price. In addition, there are high investment costs for a heat pump, a relatively short service life of the heat pump, and further significant issues not to be underestimated.

One increasingly reads about horrendous electricity consumption with heat pumps, cold apartments, a lack of and unqualified specialists who can properly adjust and maintain a heat pump.

There is nothing against an oil heating system.

Just replace oil with electricity in your statement. The same now applies to the electricity price.

No. Oil will always produce CO2 when burned, and the rising CO2 pricing will therefore be passed on 1:1.
With electricity, there is indeed also a CO2 component in its generation (in the mix), but this is significantly smaller and will continue to shrink in the future. The gap in price increases will therefore continue to widen.

In addition, there are high investment costs for a heat pump,

Oh no. Starting at €20,000 from a professional company for the monoblock BEFORE subsidies. It’s not that wild anymore.

relatively short lifespan of the heat pump

What is "relatively short"? The normal lifespan is now given as 20 years. Even for commercial use, a depreciation period of 15 years is now recommended. Poor heating design with corresponding short cycling shortens the lifespan. But that’s also the case with many other devices and/or machines (best example is the car with exclusively short trips – as an internal combustion engine, not as an electric vehicle).

further not to be underestimated problems.

Which ones specifically?

One reads more and more about horrendous electricity consumption with heat pumps, cold apartments, missing and unqualified specialists who can properly set up and maintain a heat pump.

Wow, a colorful bouquet of points. I also read more and more about horrendous heating costs in old houses with oil heating. But a lack of specialists does not mean the heat pump is rubbish. Just because specialists for building a Maybach are missing doesn’t mean the product is directly bad.

The gap in the price increase will therefore continue to widen.

You obviously have prophetic abilities.

The concrete problem with the heat pump is the poor and completely outdated grid expansion in Germany. There are reports of planned forced shutdowns, uncertain electricity supplies, or even insolvencies of electricity providers. This issue will obviously become a topic with the increasing number of heat pumps and electric vehicles. I won't even start on rising electricity prices here.

The purely politically induced CO² taxation in Germany, on the other hand, is purely ideologically driven. I am relaxed about this with future governments. Especially with AfD participating in the government, which will probably abolish all this CO² nonsense again.

And it has always been like this. Oil kept getting cheaper. Advantage: I can store it and buy it in stock. With electricity and natural gas, that is not possible. And in 2021, I believe we were somewhere around 30 cents per liter of heating oil. CO² or not.

You obviously have clairvoyant abilities.

No. But knowledge of the subject. I can read laws. And there are market laws as well, to which prices are also subject (by the way, the CO2 taxation is a European law, not an invention from Germany, and therefore cannot simply be abolished in Germany).

One hears, after all

Yep, that’s where you get your knowledge from.

Especially with AfD participation in government, which will probably abolish all this CO² nonsense again.

Now you have clairvoyant abilities. Why should the AfD ever come into government responsibility for Germany? Have you followed the polling trends? Oh right, they’re all fake...

Man, why do I even write so much, just because a stupid AfD follower without education and knowledge of economics claims some things...
And doesn’t address points at all because he realizes he has written nonsense again.