Is underfloor heating in the basement useful??

Whether there will only be heat pump heating systems in 10 years remains to be seen. I am rather skeptical. If energy prices and the supply situation continue as they are, there will likely be fewer heat pumps in 10 years. E-cars and heat pumps will not work in our regions with maybe again normal winters like the last one. If everything goes as well as the digitization offensive of the last 20 years in Germany, combined with an ecological transformation, then I am somewhat worried. As an employee of the [Stadtwerke] told me recently: If we have a quota of only 20 percent of e-cars, our power grids are overloaded and no longer function. And if in winter all the heat pumps also have to electrically provide additional heating.

The employee obviously does not know what he is talking about and ignores all statements from scientists on the subject - and the Federal Constitutional Court has decided on the heat pump. There is not much more to discuss... However, I am also worried because it is quite obvious that a large part of the population (CDU, SPD, FDP, AFD) simply has not grasped it yet...

As you can see, opinions differ somewhat here. If I were you, I would ask the specialist who will install the heating system later. After all, they must also ensure that it works as intended. Spending several thousand euros more solely based on opinions in this forum seems questionable to me. If the normal radiators were so incredibly bad and later caused problems with mold or exorbitantly high heating costs, they would hardly be included as standard. Because the result would then be a lot of trouble with customers, which would ultimately reduce the margin.

Sorry, but this is a classic fallacy. The contracting party is most likely a company with limited liability founded exclusively for the project. Once the project has been fully accepted (including remaining work and even confirmed defect claims), the profit will be transferred to a parent company within a year. Defect claims are either not addressed at all and only ignored or at best stalled and referred to subcontractors. However, they will not take action if they are not paid, which the developer company no longer does (as there are no assets left). Legal action leads nowhere, as it can be delayed through further reorganizations and "sales" and even if you eventually win in court, there are no financial assets left from which potential defect compensations can be paid.

Ever worked with heating engineers before?

Yes, several times already, there were never any problems. But that might also be because we live in a small community and the heating engineers in the nearby area have all been around for a very long time and therefore know each other (or some employees of them). So not as anonymous as in a big city. But I stick to my opinion: Most of those who write here about the topics are not experts, but have read up on the subject as part of their own house-building project. And such an opinion is supposed to carry more weight than that of a professional (and by that I don’t mean the developer/seller)? That can’t be serious.