Technical comparison of air-to-water heat pump

Yes, you would be surprised at what is sold as underfloor heating in other countries and what temperatures prevail in the systems there. At comparable outdoor temperatures as here with us.

Are the supply temperatures similarly high as in my system?

My Tecalor currently has a return temperature of 24.0 degrees at 3.5 degrees outdoor temperature. It works.

At what room temperature? 16°C or 24°C
:-)

At what room temperature? 16°C or 24°C :)

Currently 22.5 degrees

Here it is always talked about lowering the supply temperature below 35°. I understand that. Are you talking about the regulated supply temperature here, or the supply temperature with NAT? I had a conversation about this with the heating installer from the house construction company. I questioned lowering the supply/return from 35/28, and he explained to me that these are the assumed values in the thermal protection calculation. In reality, the supply temperatures are then around 28-30°C.

We are also in a new construction situation and it is really difficult. The general contractor specifies the heating installer, and he has his favorite manufacturers. Currently for us Viessmann. He talks about installing a Vitocal 200-S D09. Admittedly, according to the annual performance factor calculator, it has good values for an air-water heat pump. Underfloor heating is installed "according to the latest standards" – spacing about 10 cm, all heating circuit lengths the same, etc.

Nevertheless, the uncertainty remains.

Regards, sci