[patall]

For the primary source of general heating yes. As a secondary to heat the living room oven, I highly doubt that, too many relatives that I just bought lignite with last autumn. Could be more prominent in eastern Germany though.

[lispm]

There isn't much coal used - you will have a hard time finding a coal supply in many cities. Some regions in eastern Germany and in the Rhine/Ruhr region...

Since coal mines are being closed, the miners will not get any more coal (as part of their salary) and thus they are looking for alternatives:

https://www.gelsenwasser.de/unternehmen/presse/pressearchiv/...

[Tomte]

I've never seen a coal oven in a home. All those "Kachelöfen" and "Kamine" are being fed wood, in several forms.