yes the repayment subsidy of 2500€. however, you have to spend quite a bit on it, which you never get back. they offered us an air heat pump (with [kfw55 guaranteed]) for effectively about 6000€ (the 2500 are deducted, lower interest rates, no gas connection, etc.). however, I am not a big fan of heating with electricity because the electricity has to come from somewhere. from 1kwh of electricity I get at best 3kwh of heat, but electricity costs 4 times as much as gas. (with the right tariff 3 times as much). in the end, for me, it is a fairy tale calculation with the risk of generating a killer electricity bill (then when you need heat the system is at its most inefficient). so I prefer to stick with gas, because heat costs the same amount throughout the year. but that's not what this is about.