Rough installation of central ventilation system

Well, the 180 model can circulate up to a maximum of 250m³/h, which is really (imho) right on the edge. What minimum ventilation rate was calculated for your house? If I were in your position, I would at least take the 280 model, which delivers up to 350. That is a bit more relaxed and should be quieter during normal operation.

The thing is: We didn’t get any information about the ventilation planning at all. It was done by the installer together with Tecalor.

That’s how the 180 model came about.

But Tecalor’s m² specifications for the respective ventilation systems should roughly be correct, right?

I think if a single-family house up to 250m² living space can be operated with it, then it shouldn’t be too wrong, right?

Wouldn’t a 280 model be oversized?

Of course, I’m not really familiar with this either.

Besides, the ventilation system is unfortunately already on site and already in the basement :D

TTL 9.5

Can your small house really have such a high heating load?

So far, I assumed that this would at least be necessary for efficient heat recovery?

The ventilation system extracts heat from the exhaust air and transfers it to the supply air. What does the water in the floor have to do with that? There is no interface.

Oh God, I just noticed this is a new building! Please pull out all the stops to obtain your room-by-room heating load calculation and then work with the plumbing to select a suitable heat pump. Roughly estimated, the one you mentioned is about 2.5 times too large. And yes, that is bad. I don’t find the sizing of the ventilation system so dramatic at first glance. But there is also a room-by-room calculation for that. If the unit is already running at its limit for the minimum amount, it is of course too small.

Oh God, I just realized this is a new building! Please do everything possible to get your room-by-room heating load calculation, and then coordinate with the plumbing to select a suitable heat pump. Roughly estimated, the one you mentioned is oversized by a factor of 2.5. And yes, that is bad.

At first glance, I don't find the sizing of the ventilation system to be that dramatic. But there is also a room-by-room calculation for that. If the unit is already running at its limit for the minimum required amount, then it is naturally too small.

The heat pump is already ready for installation in the basement...

This unit was recommended to us instead of the combined unit, since we have a PURE indoor installation - not a split system.

Is this unit completely incorrectly sized? What else should/could have been chosen?

What disadvantages does this cause for me?

Is this device completely wrongly sized? What else should/could have been chosen? What disadvantages does this cause for me?

As described above, you only know which models are suitable once you know your exact heating load. A new building of your size should manage with 3kW in flat terrain. Let’s say 4. But certainly not 10. The disadvantage is constant cycling. This leads to much higher wear of the system and higher energy consumption. Additionally, to compensate for the planning error, a large heating buffer was most likely planned. Both together lead to additional costs of easily 6-7k €. And over the years, the losses, inefficiency, and higher wear add up to at least as much again. So I would definitely do something... At least open your own thread here again and gather more opinions on this.

230 sqm with 3 kW heating load? A very ambitious estimate, the insulation would have to meet passive house standard.