KfW40+ with external technical building

... outside the thermal envelope ...

At the beginning, we had quite a bit of trouble finding space for the technology.
Heat pump, storage tank, electricity meter, photovoltaic battery, inverter, etc. all need a
bit of space for 4WE.

Then we came up with the idea of an external technical room that may be built on the boundary
(if no fireplace, i.e. oil or gas heating, is installed).

Then we were informed that the notes/conditions for
KfW40+ state that the heat generators must be inside the thermal envelope.

That made us doubt the feasibility of implementation.

Today came the good news: Our architect called the KFW and
received the information that this is allowed.

I thought this information could be both an encouragement and information
to consider an external technical room (as an alternative to the expensive basement).

zapp

... received the plans from the architect today and also had a brief phone call. But since we were all very busy, unfortunately, we could only exchange a few details for now.

External space for technology is definitely O.K. It will be directly attached to the north side of the house and closes at the top with the border. It does not need to be insulated to the extreme level required for KfW40+, but "only" frost-free or as much as necessary for the devices. According to KfW, this applies "inside" the thermal envelope specifically for KfW55 in "individual consideration?". I am not an architect or energy planner, and I didn’t understand it better in the short time. But the important thing is that it works (for us with KfW40+ or passive house standard)!