When it comes to heating, there are a few technical terms that need to be explained. You can find everything you need to know here. In alphabetical order.
Low-sulphur gas oil
A high-quality distillate oil. The sulphur content of low-sulphur gas oil does not exceed 50 mg/kg. A minimum quality for the fuel is laid down by the (German) standard DIN 51603-EL-1-schwefelarm.