BAFA funding for air-water heat pumps in new construction - how does it work?

other factors also play a role here, such as the heating limit temperature, proportion of hot water, standard external temperature, supply and return temperature to arrive at the respective annual performance factor. Annual performance factor calculators can be found on the internet

I was not aware of that. Anyway. The manufacturer has a subsidy calculator for his products. If it is up to date, it shows €1500 in subsidies.

The annual performance factor calculator predicts an annual performance factor of 3.97 for the Stiebel under standard conditions.

So this means I will submit the application "Antrag auf Förderung einer effizienten Wärmepumpe" after the installation?

After the installation, it is too late.

so it means I will submit the application "Application for funding of an efficient heat pump" after installation?

Then you are too late. It must be submitted BEFORE commissioning. So officially before signing the BEV if you are building with a general contractor (GU). We had the application for our THZ 504 (identical to Stiebel) approved. Annual performance factor 4.5. The calculators on the internet are not really meaningful for BAFA funding. We initially received a rejection and then sent the calculations for BAFA from Tecalor themselves. They were accepted. Apparently, some factors are missing in the calculators.

No, there are exactly these 2 applications. One is "Antrag auf Förderung einer effizienten Wärmepumpe" which states that it must be submitted within 9 months after operation. The installer also has to fill out quite a bit.

For the other application, you are right, the Innovationsdings must be before.