Do solar collectors effectively support heating?

Hi,
I would like to gather some opinions. What do you think about solar collectors that support heating?

My conditions: The house faces south and we have little shade. About 160 sqm of living space. I do not plan a large heating system in the living areas. The masonry consists of 24 cm Ytong blocks. New doors and windows will be installed. Roof insulation is present.

An energy consultant advised me against solar collectors, saying we have too little sunlight. Also, high investment costs and hardly any energy savings. For domestic hot water support, that would be okay.

Now I also visited two specialist companies. Company A said the opposite. The investments would be moderate and the heating support would be wonderful.

The second company gave arguments similar to the energy consultant. They said at least 800 liters of storage are necessary, which is of course very expensive. They also only recommended it for domestic hot water support.

So, now I'm at my wit's end and ask here, what do you think?

Thank you very much

Well, if the experts themselves are not even of the same opinion, what are we laypeople supposed to say? :) Solar energy is always also a matter of belief, because at the beginning there are enormous costs, which can pay off after many, many years. Nevertheless, if I had the money, I would do it that way, because otherwise your money loses value every year (Invlation).

Solar energy is always also a matter of belief, because at the beginning there are initially enormous costs, which can pay off after many, many years.

That is true at first. I think such heating support has too few advantages. In winter, when I need it, it is dark and it gets light too late. Often, during the day here, it is also gloomy and no sun shines at all. On top of that, the enormously high investment costs, no thank you.

Here are at least 800 liters

How big is this 800-liter tank? That could already take up half a room and I find that quite steep.

I don’t know exactly how big the 800-liter tank is either. But there is space available. It’s not a new building either. I would also distribute it to 2 tanks with 400 liters each.

Hello,

I think a thermal solar system is more cost-effective than this heating-supporting variant. I have my doubts about whether this 800-liter buffer tank is sufficient. But it still makes sense to use this system for domestic hot water preparation. Especially if there is no surface heating in the house.
BG