Eligible costs for heat pump

Correct, we did it that way as well. We then had a separate invoice issued for the heat pump and submitted it (along with some other things). The payment approval arrived a few days ago.

We have received and submitted all the necessary documents from the installer. He strictly refused to include the Smart Home components. Therefore, we did it ourselves (privately). The final documents have now been uploaded for three weeks, and a confirmation that they are being processed has already been received.

Ok. Thanks already for the answers :)
The situation for us is that the air-water heat pump is included in the price.
Originally, a different manufacturer was specified there.
Now the general contractor has offered us to switch to a Vaillant (with the exact model specified) at no additional cost.

From my understanding, the switch would be a new order for the heating system. But then I need a separate cost estimate for the heating system from the general contractor, and the heating installer has to fill out all the data for the heating system planning. Otherwise, I can’t even submit the application to the BAFA, right?

Yes, you first need an offer that really only includes the heat pump and the necessary work and materials for it. There are only very few surrounding measures in new construction (e.g. water softening system to extend the service life) that are also eligible for funding. Then the BAFA check after one year (can be funded). And possibly a ventilation system (but only with joint control with the heat pump). Later, when you submit the costs, you need, among other things, an invoice/proof of costs for the same items. Since your contracting partner is your general contractor, they must issue it. Some have difficulty with that (so says my general contractor). It is best to read the BAFA information sheet very carefully. It basically contains everything; there is just a lot of unnecessary talk. But, for example, it also states that the concrete commissioning of the executing installer counts as the deadline (so you must apply before that), not the contract with the general contractor.

What might be quite interesting for some, especially with regard to the increasingly popular comprehensive coverage mentality:

If a Vaillant system is purchased, one can obtain protection for the BAFA subsidy for €100 net.
In other words, for this amount, Vaillant guarantees the subsidy regardless of whether a subsidy fund is later depleted or anything else leads to exclusion from the subsidy.

Is this the Vaillant subsidy service (via Sunshine Energieberatung GmbH, Garbsen)?
According to the form I have, it costs €119 plus VAT.

Did you also use this? You also have Vaillant, right?

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Can someone tell me if underfloor heating is also eligible for funding? It is part of the heating system, isn’t it, or am I wrong?

Is this the Vaillant grant service (via Sunshine Energieberatung GmbH, Garbsen)?
According to the form I have, it costs 119 EUR plus VAT.

I answer my own question. Yes, it is.
However, contrary to the statement of , it is not a "comprehensive insurance." The conditions for the grant service state the following:

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