Abstract: The invention relates to a deep-frying device having a closed system, wherein the frying fat or oil can be pumped round continuously from a feedstock reservoir (3), in which the oil can be kept at the desired temperature, to the deep-frying vessel (2) and back to the feedstock reservoir (3), cleaning of the oil being carried out, during the return of the latter from the deep-frying vessel (2) to the feedstock reservoir (3), by feeding the oil into an overflow centrifuge (9), the centre line of which forms an angle with the vertical and in which is located a disposable bag (12?) in which contaminants are collected, which bag (12?) can be removed via a front aperture by taking out the bag as soon as a regulating system has ensured that the deep-frying vessel (2) has been emptied via the centrifuge (9), and wherein the heating preferably takes place indirectly by means of a hot medium, such as a fluid, which circulates through double walls (23, 24; 25, 26) of the feedstock reservoir (3?) and the deep-frying vess

Abstract: The invention relates to a deep-fat fryer having a frying vessel (17) and at least one heating element (26) arranged in the frying vessel (17). The frying vessel accommodates a frying medium, for example frying fat or oil, the heating element first of all melting the latter, if appropriate, and then heating it to a temperature of from typically 100 to 200° C., in particular of from 150 to 190° C. In the case of known deep-fat fryers, the frying vessel usually consists of metal, for example stainless steel, enameled steel or coated, non-coated or anodized aluminum. In contrast, the deep-fat fryer according to the invention is characterized in that the frying vessel (17) consists, at least in part, of a transparent or see-through material, which allows visual monitoring of the frying process.