Bioethanol is essentially alcohol, so in its liquid form, it does have a recognizable scent.
However, when burned, it should not produce any noticeable odour. We describe it as "virtually" odourless, meaning you may only detect a faint heat smell, similar to the scent of something burning, but nothing more.
The phase in which you can smell the alcohol scent more strongly occurs shortly after extinguishing the flame, while the liquid is still hot. Therefore, it is important to keep the burner closed during the cooling process and when not in use to prevent excess evaporation.
Of course, the quality of the fuel is crucial. We always recommend starting with our Premium Bioethanol Fuel to ensure you experience the proper burn quality and to avoid low-quality fuels that may create an unusual flame colour and produce a stronger smell.