Is the building efficiency bonus for a Kfw55 house actually 0.5*innovation funding? So for a ground-source heat pump 0.5*4500=2250€. And therefore the total funding is 4500+2250=6750€?
There was recently a topic about BAFA funding. And that it is almost impossible to get funding for air-to-water heat pumps in new buildings because achieving an annual performance factor of at least 4.5 is very difficult.
Yes, that is correct. It is definitely possible. Even though I have already entered the data of a few air-to-water heat pumps into the annual performance factor calculator and did not reach 4.5.
Also, an employee of the BAFA wrote that air-to-water heat pumps are predominantly subsidized in existing buildings, as a lower annual performance factor is sufficient there.
Then it would be interesting which air-to-water heat pumps are good to achieve an annual performance factor of 4.5.