I'll write it again very slowly :D. "Gas and solar for hot water".
How much electricity should I be able to generate with that and by what means? Maybe through static charging?
None at all, but in the efficiency calculation of the system, you have to factor in that the solar pump requires electricity to operate. Unfortunately, quite old and power-hungry pumps are still sometimes installed to keep the systems cheap.
Well, it is normal that a solar system can sometimes be not so efficient, but if everyone then goes back to wood or pellets, that is also not a solution. On the one hand, that stuff is only so cheap because many still have gas or oil, and if everyone switched over, it would have serious consequences. On the one hand, the air in cities and villages would become bad again (I know that very well from the GDR), and on the other hand, the prices for pellets and wood would explode because not that much grows back. Currently, there is still a huge surplus, and that is why it is so inexpensive.
During the cold period of the 15th-16th centuries, almost exclusively wood was used for heating in Germany, and in our region of Thuringia, where the Thuringian Forest now stands, quite a lot was deforested. Considering that far fewer people lived here back then, I don’t even want to imagine where you would get all the wood needed for today’s demand at 100% wood heating. Well, we still have a few rainforests. :rolleyes:
I think alternative heating methods should definitely be planned for. In that respect, I find solar thermal still the most efficient. After all, we have up there a fusion reactor that provides free energy for the next 4 billion years without having to worry about waste disposal or operational safety.