Oil out, gas condensing boiler + solar in?

I think you would be well served with an energy certificate, to then have data that can be used.

Well, the consumption will be known. You probably mean an energy *advisor* :)

Well, the consumption will be known. You probably mean an energy*consultant* :)

Not bad either...
Let's agree on competent advice ;)
Appointment with energy consultant (thanks, ), to then know what is possible with how much cost if the system fails :)

Just wondering - what bad things could have happened there?

Google "Staufen." But it is a very special type of subsoil.

Yes, you are not wrong about that, but the electricity is not lost in the summer; it is fed into the grid and compensated. With the profit, you then buy electricity again in the winter. So I have about 0€ heating costs.

What profit? I pay 30 cents per kilowatt hour, but only get 11 cents for feeding in. A pretty bad deal...

If anything, only setups where you consume the electricity you produce yourself make sense. And here I see the problem that I have the electricity when I don't need it. And when I need it, I don't have any.

Matthias

The comparison makes no sense at all... "I buy an apple for 30 cents, but if I grow and eat it myself, someone pays me 11 cents for it - no, that is pointless"... Without considering the cost of the apple tree and its care, the statement is worthless.

Without going into too much detail: For household electricity and heat pump electricity, I use about 5500 kWh. I can generate 2000 kWh myself, and I have to buy 3500 kWh. The costs for purchasing roughly match what I receive in feed-in tariffs - ergo 0€ heating and electricity costs.

Explained a bit further, I end up with a few euros in electricity costs per month on average, but that doesn’t change the principle.

Ideally, of course, one could produce all the electricity needed in winter themselves - that is also possible, but less economical.

What kind of profit? I pay 30 cents per kilowatt-hour but only get 11 cents for feeding in. A pretty bad deal...

You don't have to buy the kilowatt-hour you sell beforehand. ;-)

Since the cells have become cheaper, photovoltaics are still worthwhile today. Of course, the faster the better, the more you can consume yourself. (Air conditioning, pool, water heating between 12 and 2 p.m...)