In future, the conventional heating oil will be mixed more and more with bio-oil or bio-oil constituents. The ROTEX A1 is already prepared for the combustion of all types of commercially-available heating oils, including those with biogenic constituents. With the ROTEX A1, biogenic constituents (FAME) of up to approx. 20%, can be mixed into the heating oil without creating restrictions on the operational safety and without increased maintenance expenditure. The burner components have been developed in such as way that they can cope with the demands placed on them by bio-oil, in other words: ready for bio-oil.