Air heat pump or use gas and solar?

So, as I said, if I were you, I wouldn't worry about it and would just put the simple collectors on the 15°.

As I said, if I were you, I wouldn’t worry about it and would just put the simple collectors at 15°.

The GÜ will 99% not do that. He will build it as required by the Energy Saving Ordinance with the relevant calculations. And if they have determined that an angling is necessary, then it will be so. Because he also has to ensure that he builds in compliance with the Energy Saving Ordinance. There will be no "shenanigans" there.

Then one more, but without an angle.
Provided it is interesting in terms of price.

Yep, that would be an idea too.

I also think it's good. Let's just see what is cheaper. Tubes or 1 more flat plate collector.

So if you get a brine heat pump for that price, then you really don't need to think twice. What could be better? Do it!