Cost planning

We paid 10,000 € for the heating including services and 9,290 € for 2x70m drilling. Hopefully, there will be 4,500 € refunded by the BAFA. That would make it cost around 15K €. Gas boiler probably more like 4K €, connection 3K € (long way), ST I don’t know exactly, but I think maybe another 4K € (?). So for us, it would have been about 4K € cheaper - maybe also "only" 3.

Is there additional money from BAFA besides KFW?
I don't know their funding at all.
Can't find anything like that on the homepage either?
2x 70m is about right, I would have also estimated €10,000.

BaFa has nothing to do with kfw. If you apply for funding before commissioning, you will receive, for example, €4500 for a brine water heat pump with deep drilling if the annual performance factor exceeds 4.5 calculated, you take out insurance for the drilling and a few other small things.