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2. The heating engineer will surely do it right. Yes, many think that, and the internet is full of users who have problems

So I want to briefly pick this up again. Not because I want to claim that it was done incorrectly or anything like that. Whether you listen to the tips or advice is your business, but maybe some people reading here are just in the planning stage and therefore glad to think about it beforehand.

1. "Thermostats on the wall" — don’t be under the misconception that you can just "turn up" the temperature here. Your heating system is set to certain temperatures. This heating output is delivered. The "thermostat on the wall" is the individual room control. It ensures that when the temperature you set is reached, this control shuts off the underfloor heating. In most cases this is pointless, but that’s another topic.

2. The heating engineer will do it right.
Yes, many think that, and the internet is full of users who have problems. Where does that come from? You could argue about it, but in my opinion, a significant part is that heating engineers are not refrigeration specialists (heat pump = refrigerator just reversed) but come from the "I-make-fire" faction. They can handle gas cans and oil burners. They have high temperatures and don’t know what to do with them. Therefore, high flow temperatures and buffer tanks are not harmful or even possibly useful. But heat pumps work differently. They work best with low flow temperatures. Most heating engineers rely heavily on manufacturer specifications and planning. Which of course have nothing against selling the larger model of the heat pump or a big buffer tank etc. What comes out of it? A standard dimensioning with 35 degrees flow temperature, which in my view is outdated. And then either the heating engineer has installed too much safety buffer and you get nice warmth, but the electricity meter is running, or you have the family complaining that the bathroom is too cold and you should turn up the heating.

In the best case none of that applies, but you cannot absolutely rely on it. Especially if you heat with a heat pump, I wouldn’t rely solely on good names and reputation—that's still my

3. They will do it right.

In my opinion, the most dangerous sentence when building a house. You should keep an eye on what kind of house is being delivered to you. Either you deal with many topics yourself at least enough to ask a few "stupid questions," or if you don’t feel like it (which is not a problem) you should urgently have someone who takes over that. Architect or expert etc. Reputation or not, no company always has everything under control. It does not have to be intentional, but so many things can go wrong and get messed up during construction. The worst thing is, many of those cannot be fixed later. Not without disproportionate effort.

Everyone can go their own way when building a house, no one has to listen to recommendations here in the forum, but many of them are not without reason. And sure, you can’t train yourself into a civil engineer and monitor everything down to the smallest detail, but what I strongly advise against is the attitude "I have a construction company with a good reputation" — it’ll turn out fine.

Sorry, this doesn’t really belong to the topic of house pictures but it came from one of the pictures here and I wanted to pass this on as a well-meant recommendation.

that it is simply not a standard setup with 35°

because our system can also achieve higher supply temperatures. But I could criticize that if it wasn’t sufficiently warm for us with a 35° supply, since we pay people to specifically design it for that.