Air-to-water heat pump sizing in new construction

And that means? Mixing buffer is useless?

At the low flow temperature produced by the heat pump, the heating water can flow directly into the underfloor heating. In the mixing buffer, you enter at a higher temperature so that the appropriate flow temperature can be "mixed" accordingly. This makes sense if the heat generator produces high temperatures, e.g., if it is a water-bearing wood stove.

Setting that aside. What do you think how large such a buffer has to be to be significant at all compared to the buffer capacity of the underfloor heating?

Monoblock = everything outside -> water pipe through the wall.

What are the parts called that are completely inside then?

Monoblock for inside?

Monoblock or split.
Outdoor air also requires an indoor-installed heat pump.

Monoblock for indoors?

Manufacturer? Model? What exactly do you mean? There are many things that are installed indoors but do not fit this topic here. Because this is about an air-to-water heat pump.

We have a Buderus wpl ik8, which is an air-water heat pump and is a monoblock for indoors, air is drawn in through a light well.

But never mind, back to the topic