Is gas condensing boiler heating sensible for a newly built single-family house according to the Energy Saving Ordinance 2016?

If you don't feel like dealing with your heating system, you should choose gas. Otherwise, you can say that acquisition and operating costs are about the same. No one can know what electricity and gas prices will look like in 10 years.

Now one can extrapolate somewhat. In the last 10 years, the gas price has remained largely stable. With regard to Nordstream 1 and 2, this should also remain the case for the next 10 years.

That may be true. However, most of the gas comes from Russia, right? If someone flips the switch there, the situation in DE looks relatively bad quite quickly. For electricity for heat pumps, you have a) suppliers from stable countries and b) can at least generate a small part of it yourself, both throughout DE and on your own roof. So there are arguments for and against both options. In this respect, the suggestion earlier with the pellet heating was meant to be funny, but effectively also somehow not entirely without... :-)

In Russia, no one will pull the lever; gas and oil have practically been the only sources of foreign currency for the past 20 years. There is no end in sight. Nordstream 1 and 2 are largely financed, constructed, and later operated by Russia. Thus, with completion, more gas will come to [D], not less. What this means in commercial terms is either a constant or decreasing price. Because the suppliers remain the same, but more goods are available.

Which in commercial terms means either a constant or decreasing price. Because the suppliers remain the same, but there is more stock available.

In particular, the supply route is significantly more stable, as one or another problem region is bypassed.

The air-to-water heat pumps are powered by electricity. In Germany, electricity is massively produced in the north with wind and goes to waste, because whenever a line is supposed to be built from us to you in the south, the citizens' initiative is immediately ready to prevent it. Coal power is no longer an option either, because idiots chain themselves to trees and raise alarm, and no one dares to beat them down. So in the end, air-to-water heat pumps are powered with electricity from gas power plants, a bit of hydropower, and a lot of French nuclear power. Great, isn't it? We're all so green. Hypocrisy times 10. Karsten