Which heat pump? Ventilation system / Air-to-water heat pump

What do you want to compare - it has to be checked.

But I also see it like Saruss: depending on the property, you can only build over very little. If the winter is harsh, the ground can remain frozen well into the spring.

The enthusiasts usually don't mind, but the average German does - and then it's too late.

I meant studies or experiments under the same conditions. For example, a study with all three systems on the same property, and evaluation of this experiment. Where the geological suitability should already be similarly good as the geographical location, etc.

I don't know any - this study would also be known in the relevant forums.

Hmm, pity, but there is probably nothing that can be done. Perhaps any other scientific studies on the topic known?

But there are already studies on heating topics... also geothermal energy - although I don't remember exactly what is explicitly being compared there. Just Google a bit. The problem is that all solutions work and in the end the costs per comfort hour depend on many influencing factors... including user behavior. That is just very hard to standardize.

Thank you, I will take a look.

the costs per comfort hour depend on many factors.. also on user behavior.

Exactly FOR THAT REASON I want an independent and standardized comparison option and not experiential values from different users
Because how often user X now bathes or showers with consumption Y is often not mentioned.
Later I decide on option X because it was cheap for that person, but they live with 18°C room temperature in winter and only shower once a week for 5 minutes.
Then I would have much higher consumption values and the comparison was useless.