Vestaxx window heating - experiences?

Addendum: I read through it again to find concrete numbers for a 20-year period. Statista shows an increase of 125.5% from 2002 to today...

I want to bring up a completely different aspect. Sustainability, taxonomy, ESG, and the Building Energy Act.

Do you really believe that an electric direct heating system (no matter what type) has a future? I would bet that this type of heating will be banned in the not too distant future and that all the discussions going in circles here will be over. The energy consumption is simply too high. Maybe it will still be acceptable as an emergency solution in a passive house. Nothing more.

Here the answer is much simpler. Yes, you are miscalculating. Interest would be €9,013, but it can be completely ignored, since the increase on electricity is also not taken into account. If that is also around 3-4% per year, it balances out.

No, the calculator doesn't lie: 23,000 x 3.5% = 805 x 20 years = 16,000,-

You must of course repay the air-water heat pump loan with the money you would spend on electricity for the direct heating.

I think the best is to produce your own electricity, then you don’t have to care about the electricity price.
Best as much as so that I don’t have to buy anything. Compensation payments are already very low now.

But such a big photovoltaic system is certainly expensive.

That has already been discussed a hundred times. There is not much photovoltaic electricity in winter, and the roof area on a single-family house is also limited.