Comparison of groundwater / brine / air heat pump

I don’t think anyone here idolizes the heat pump and touts it as a cure-all. If you don’t want cooling, are looking for an inexpensive heating medium, and already have a gas line on the property, you can of course use gas. But even in cold regions, I wouldn’t want to install an air-to-water heat pump.

Well.... idolize flow temperature. not me though, I do read that for many there is simply nothing else from the outset. Just as an example: I repeatedly read e.g. as a thread opener: “I am planning a city villa, Kfw55, underfloor heating, air-to-water heat pump, KNX....” Then I think to myself, okay, a young person wants to build a house for their family and understandably often has zero knowledge/experience that could have brought them to such certainty. At least to me that says that some kind of pressure/advertising/fear must have influenced them to decide on something they mostly don’t really know themselves yet. I miss the questioning of WHAT is the best and most suitable for my family. Flow temperature. a heating system with wood, with radiators, electricity, gas, a certain one of these heat pump systems, why the fixation on the show villa and not on what FOR ME INDIVIDUALLY as living space INSIDE could best fit our life?? Predetermined must-haves already take hold uncritically in some builders, even with me as an older applicant with various house-building experience such things have an effect. Many babble e.g. about KNX etc. (I myself have no idea about it, but I won’t miss it either) during the course of the thread, you then read from people in the know that they knew nothing about it except that they wanted it; for whatever reason! Just as they want Kfw-xy, often without considering possible other effects/circumstances that come with it. For this reason and only this reason, I advocate for more diversity and yes, I have the impression that some things are seen as the ultimate and allegedly a must-have, even though that usually isn’t the case or wouldn’t stand up to a factual discussion. For example, if you don’t have the right craftsman/general contractor, a heat pump can become a horror, or if you get a completely excessive offer for drilling that can also be the wrong decision. By the way? What well-functioning cooling is there with an air-to-water heat pump?

By the way? What well-functioning cooling options are there with an air-water heat pump?

Separate air conditioning. By the way, this applies to every heating system in a normal single-family house (unless you heat directly with split air-conditioning units).

By the way? What well-functioning cooling options are there with an air-to-water heat pump?

"Working well" is a matter of design and I never said it like that. In principle, the function exists, and even if the cooling capacity is not comparable to an air conditioner, I would strongly argue that it is at least better than with a gas heating system :) There are many users who are satisfied with the cooling capacity of the heat pump, especially in combination with a BKA (which brings us back to the topic of proper design according to the use scenario). We, for example, install an air conditioner ourselves because I don't think much of the cooling - but the technical possibilities do exist. I don't want to create conflicts here either. As you yourself say, the application is decisive and should be the main factor in choosing the heating system (and for many other things in house construction).

In principle, nowadays construction is simply done routinely with air-to-water heat pumps. Whether this is always so smart is another question. Most builders have no idea about this and just trust what the supposed expert says. But that's always the case. There was also a time when oil heaters were the new "hot stuff" and wood stoves suddenly became out of fashion. That wouldn't have been necessary either, since there is plenty of wood here for heating.

With your last post, you actually hit the core of the whole story: you have to be aware of what you want for yourself and enforce these requirements during construction, even if sometimes you go against the current with your wishes. But that requires the will to engage with the subject matter. And quite a few builders, it seems, don't want to do that. I know enough friends who have built and couldn't even say whether they built with sand-lime brick or Poroton.

"Works well" is a matter of interpretation and I never wrote it like that.

I know, I didn’t understand it that way either!
So far I had repeatedly read and heard something on the subject, that precisely this hope might sometimes have been the final decision criterion for a heating system and that one therefore also expected too much regarding cooling.

I don’t want to create divisions here either.

I didn’t suspect that either.

Basically nowadays people just build with air-water heat pumps as a standard. Whether that is always so wise is another question.

That’s exactly what I mean. Often it can be, sometimes maybe, but less.

Most builders have no idea about this and simply trust what the so-called expert says. But that is always the case. There was once a time when oil heating systems were the new "hot stuff" and wood stoves suddenly out of fashion. That wouldn’t have been necessary either, since there is plenty of wood here for heating.

That was the case with my first build in 1990; my buddy was a heating engineer and he said what should go in. If you also imagine (hard to do) that at that time there was practically no internet with all the information possibilities and basically no mobile phones either, then THAT understandably was the decision criterion. If he had said wood back then, that would have gone in. If it was cold I called him and he made it warm again immediately... how do you say nowadays? 24/7 plus lunch break! By the way, THIS is my primary requirement for a heating system, that it works reliably, doesn’t annoy me, I can help myself if necessary, or the problem is usually easy to fix. Personally, I don’t like the inertia of underfloor heating at all, but that’s my personal issue.

You have to be aware of what you want for yourself and enforce these demands during construction, even if sometimes you go against the grain with your wishes. But that requires the will to deal with the subject.

Exactly!

I know enough friends who have built and couldn’t even say whether they built with sand-lime bricks or Poroton.

I find the layman discussions here about the pros and cons of some bricks somewhat exaggerated at times.
If you can live satisfied like that I honestly find it great. I have a good friend who built 30 years ago and wouldn’t know that either. He never complained, was always satisfied... really enviable!
At least regarding heating I’m somewhat similar; for our build I fought my way through all systems and quickly realized that a heat pump wouldn’t be the right thing for me, and if it were, it would probably have been a geothermal borehole.