35° supply temperature is planned.
I didn't think it looked uneven on site. The photo was taken with a mobile phone camera through a window, from one side through an entire 11m long room. I think it's not quite representative.
Whether they are too far apart, I can't tell you, I'm not the heating engineer. But I have thermostats on the wall where I can set the temperature, and I know what the builder assured me. Honestly, I can't imagine that with almost 400 houses per year, almost all built with underfloor heating, they work with a subcontractor who delivers botched work and that there are no homeowners complaining.
So I want to pick this up again briefly. Not because I want to claim that it was done wrongly or anything like that. Whether you listen to tips or advice is up to you, but maybe some people reading here are still in the planning stage and are therefore glad to think about it beforehand.
1. "Thermostats on the wall" – don't be under the illusion about that. You can't "turn up" the temperature here. Your heating is set to certain temperatures. This heat 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 a different 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? One could argue about it; in my opinion, it is largely because heating engineers are not refrigeration specialists (heat pump = a refrigerator turned inside out) but they come from the "I-make-fire" faction. They know about gas canisters and oil burners. They have high temperatures and don't know where to put them. Therefore, high supply temperatures and buffer tanks are not harmful or perhaps even useful. But heat pumps work differently. They perform best with low supply temperatures. Most heating engineers rely heavily on the specifications and plans of the manufacturers. These, of course, have no objection to selling the larger model of the heat pump or a large buffer tank, etc. What results? A standard design with 35 degrees supply temperature that, in my opinion, is not up to date. And then either the heating engineer has built in too much safety buffer and you get nice warmth, but the electricity meter runs, 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 can't rely on it necessarily. And especially if you heat with a heat pump, I would not rely solely on good names and reputation – that is also my...
3. They'll do it right.
In my opinion, this is the most dangerous sentence in house building. You really need to keep track of what kind of little house is being put up for you. Either you get involved yourself with many topics at least enough to ask a few "stupid questions" or, if you don't want to do that (which is fine), you should urgently have someone who takes this on. Architect or expert, etc.
Reputation aside, no company always has everything under control. It doesn't have to be deliberate, but so many things can go wrong and be messed up during construction. The bad thing is, many of those cannot be fixed later. Not without disproportionate effort.
Everyone can take their own path when building a house, nobody has to follow recommendations here in the forum, but many of those are not unfounded.
And sure, you can't train yourself to be a civil engineer and oversee everything down to the last detail – which I strongly advise against – but what I do advise against is the attitude "I have a construction company with a good reputation, it will be fine."
Sorry, this actually doesn't belong to the topic of house pictures but arose from one of the pictures here and I wanted to pass it on as a well-meant recommendation.