why is the entire energy situation viewed only through the prism of Germany?
Probably because Germany is the biggest economy within EU, and largely relied on Russian gas.
All in all, the cost of heating for one house would be less than 1000 EUR
Natural gas used to cost less than that for most homes. Using 15 m
3 of fire wood is terribly inefficient and heavily polluting. That's okay in remote areas, but not in cities where far too many houses stand close together.