Which heating system is suitable for our Kfw 70 house without a basement?

...Well, it's normal that a solar system can sometimes be less efficient, but if everyone goes back to wood or pellets because of that, then that is not a solution.

The standard 0815 systems installed in general contractor projects only serve the paperwork and are usually of little use to the builder. This is just burning money!

It is no coincidence that the seller/installer "forgets" the heat meter.

..I still consider solar thermal to be the most efficient.

But only if it is a "real" system. However, you won't get that for 7,000 €!

Best regards

But only if it is a "real" system. However, you can't get one for 7,000 €!

I agree with you. Mine was more expensive too, but I saved a lot of money by assembling it myself.

We have now had 3 viewings of single-family houses in the meantime. All residents had decided at the time on a geothermal heat pump (heating) and a decentralized ventilation system and are very satisfied with it. The seller of our developer advises us to go for a gas heating system. However, prices for gas or oil are rising. Geothermal energy should pay off in the long run, shouldn't it?

Hello,

... The seller of our home builder advises us to use a gas heating system. However, prices for gas or oil are rising. Geothermal energy should pay off in the long run, right?

Basically, prices for all energy sources increase in the long term. One year gas prices rise more sharply, the next year the electricity for heat pumps or the price for pellets. Gas is very often recommended by home builders because less can go wrong here (planning/dimensioning), whereas heat pumps require especially precise calculations (ventilation, heating load, room heating load, heating surfaces, hydraulics); otherwise, they do not achieve the projected annual performance factor and thus the initially very high investment is not offset by correspondingly low operating costs.
However, there is also a significant downside with gas: Usually, a solar thermal system, which is uneconomical for a single-family house, must be purchased as well (EEWG).
There is no blanket "pro" or "con," but rather the specific conditions are always crucial.
However, one thing is certain: the best energy is the energy that is not needed in the first place. => Reduce demand! This applies to all heating alternatives!
If the heating energy demand is accordingly low, the technical solution is usually cheaper due to the reduced heating load.
Kind regards