Don’t be ridiculous that will never come as bad like that. Maybe in some areas of Southern Europe but not the normal case. Germany gas stocks are 87 percent I expect 100 percent end of Sept. Just a shortage of gas but no shortage of coal. Wood oven is more for comfort feeling, not the major source for heating.
Besides most houses need very few energy. Thanks to gov subsidies if you renovate the houses. My house is built something like below, it can withstand -10 Celsius without heating. Walls, windows, doors are isolated against cold by 3 composite layers.
Für die Wärmedämmung ist der Primärenergiebedarf der
entscheidende Richtwert, Bild: Hornbach Holding AG