Chimney no longer allowed from 01.04.16 in KFW 55?

according to alternative calculation method based on reference values

Can you write complete sentences with coherence?

As I understand it, according to the calculation method "alternative verification": an additional heat generator is not permissible.

"Additional heat generators for heating or domestic hot water are not permissible, not even as supplementary heat generators."

When applying the classical verification procedure, the system notes:

"If a central heating system is present, manually loaded individual stoves that are not integrated into the circulation system cannot be taken into account. In central heating systems with integrated biomass-fed individual stoves as well as automatically fed pellet primary stoves, a maximum coverage share of 10% of the useful energy demand can be assumed."

Not allowed again for the calculation, does not mean that you cannot install a chimney.

Of course, the installation and use of a wood-burning stove is allowed, but the energy will not appear in any calculation. Nothing is prohibited here either. I have not dealt with the topic myself, but TE seems to have a knot in their head.

The installation and use of a wood stove is of course allowed, however, the energy will not appear in any calculation. Nothing is forbidden there either.

I completely agree! Why should KfW ban a fireplace?! It generates energy through renewable energy production (wood) and is even CO2 neutral (nice fairy tale...). The fireplace just simply shouldn't be included in the calculations and that's it.