Interpretation of iDM heat pump regarding COP

No, that doesn't sound right.
Is that supposed to be the interpretation in the attachment? 7kw heating load? Half of it is cut off.
Sounds like a lot of heating load already.
But nevertheless way too much for the temperature.
However, I am too much of a layman to make assumptions.
For comparison, I currently have IDM ILM 2-7 on 210sqm (including basement) with 2.5 degrees outside temperature, flow temperature 28 return temperature 25 heating output at the moment 3.5kw. And I have about Kfw 70 insulation standard.

Do you have a heating buffer? Mixer? Bypass valve?

Yes, according to the energy certificate approximately 7 kW heating capacity.

Yes, according to the energy certificate about 7 kW heating capacity.

I assume heating load. At what design temperature? The -5 degrees listed there are something different, right? My other questions?

But to make a long story short: I can only guess in an amateur way here. You have a new building...what does the heating engineer say about it?

your heat pump would then need to have a flow rate of 2155 L/h, then the 7.5kW fit

Only I cannot read that out anywhere.

Do you connect the heat pump directly to the underfloor heating or is there a buffer in between? If directly, you can add the flow rates on the flow meters at the heating circuit distributor.