Eligible costs for heat pump

4.6 according to the annual performance factor report. But that is just theoretical calculation.

As far as I understand, none of this matters for the funding itself.
You can also change the devices later. The only thing that does not change is the maximum funding amount.
And the BAFA check must of course be positive. So you must have an annual performance factor of 4.5 in practical operation. That is, the ratio of the electricity meter reading to the heat meter reading must be >=4.5.

And the BAFA check just has to come out positive. So you have to have an annual performance factor of 4.5 in actual operation. That means the ratio of the meter reading for electricity consumption to the heat meter must be >=4.5.

Do you mean the check after one year? I have to look up the exact source again. But even if the check after 1 year shows that you do not meet the annual performance factor, you do not have to repay the subsidy. The check is only meant to help you maybe optimize the heating system settings again to improve the annual performance factor.

So in that sense, the annual performance factor calculated in the application documents is decisive.

I have now found information on a pump heat information site. If you build with a general contractor (GU), you are supposed to submit the BAFA form "Confirmation of the builder" when applying.

You do not need the builder's confirmation for the actual application. In my opinion, you also don't need it if you build with a general contractor. With the GU, you get the offer from the heating installer. Afterwards, in my opinion, you need an (approximately) identical invoice + 19% VAT and then upload it. Builders are special cases.

You don’t need the confirmation from the developer for the pure application. In my opinion, you don’t need it either if you are building with a general contractor (GU). With the GU, you get the offer from the heating installer. Afterwards, in my opinion, you need an (approximately) identical invoice + 19% VAT and then upload it. Developers are special cases.

Yes, that depends a bit on the individual case. If the specific heating model is already listed in the scope of services in the construction contract with the GU, it is basically commissioned upon conclusion of the contract and thus actually already too late for the BAFA application. But then the principle mentioned by Tolino also applies, that only the commissioning of the specialist company counts. According to the info page, you should therefore include the certificate I mentioned.

But I would like to come back to my question: Are 15% of the hot water production realistic or far off? Then I can save myself all that, because the air-water heat pump will not achieve the 4.5 seasonal performance factor.

If the specific heating model is already stated in the performance description of the construction contract with the general contractor, it is basically commissioned upon conclusion of the contract and therefore actually too late for the Bafa application.

The catch can be easily dealt with by having another heat pump offered to you that definitely achieves the annual performance factor, right? My heating engineer would not sign off on it that way – he made that very clear to me when I wanted to correctly calculate the smaller (and according to the heat load calculation sufficient) heat pump for the annual performance factor.