Dear Germany, you have forests all around you. You have fireplaces that you probably boarded up. Call the chimney sweeps to make sure the are safe before winter arrives.
I lived in south of Stuttgart, Germany for four years. Every house in my village had a functioning stove/fireplace & chimney. A big portion of German homes use fuel oil, not natural gas, which will be expansive, but available.
My primary source of heat were radiators from a furnace with a 7000 liter fuel tank in my basement (fill it about every 18 months). We supplemented it with a wood stove. It took a while to heat up the house, but once it was going, you turned down the radiators.
Once, I got impatient and overloaded the stove with wood. I had the living room at 85F and was sweating with snow outside. It took forever for the temp to get down to a more reasonable 72F.
German air will be full of smoke and virtually unbreathable because they allowed a weird Scandinavian girl to set their energy policy.