The present invention refers to an oven (1). The oven (19 according to the present invention at least comprises a cooking chamber (2) for heating food, a pre-heating unit (4) for providing heated air for heating the cooking chamber (2), wherein the air can be heated inside a pre-heating chamber (6) of the pre-heating unit (4), wherein an air supply (8) is provided for conducting ambient air under pressure into the pre-heating chamber (6) of the pre-heating unit (4) for providing pressurized air inside the pre-heating chamber (6), wherein the cooking chamber (2) and the pre-heating chamber (6) are fluidly connected, wherein air pre-heated in the pre-heating chamber (6) is conductable by means of the fluid connection (10) from the pre-heating chamber (6) to the cooking chamber (2).
