A KfW Efficiency House 40 Plus meets the requirements of a KfW Efficiency House 40 and includes the following plus package:
• A power-generating system based on renewable energies
• A stationary battery storage system (electricity storage)
• A ventilation system with heat recovery
• A visualization of power generation and power consumption via a corresponding user interface
I would reconsider that with KfW. I just noticed that the loan conditions have worsened again. The repayment grant no longer really helps to make up for that.
I have had the KfW loan for a long time, but there is nothing written there about needing solar thermal systems for domestic water heating and a power storage system, so in my opinion, it would be sufficient to just install the power storage, right?