transport trolley 16 are each placed above or below the respective inductor the dimensions of the inductors 8 are adapted to the dimensions of the trolley used if there are several rows of inductors 8 they are spaced horizontally in accordance with the dimensions of the trolley used the number of which may be equal to the number of rows of inductors 8 a chamber 7 may be provided with non detachable support means instead of the detachable support means or trolley 16 described obviously the materials used to produce the trolley trays and chamber must be non magnetic to prevent their being heated and to prevent wastage of energy moreover it is obvious that operation of the inductors must not have a detrimental effect on the operation of other adjacent devices and that standards must be complied with in this regard the apparatus may simply comprise one inductor for heating one dish obviously in this case however the transport trolley may be replaced by a support means fixed in the chamber e g two tracks to receive the tray or a movable means like a trolley the number of inductors 8 in a row as well as the number of rows are determined by the intended use of the chamber the same applies to the number of access doors to the chamber any standard transport trolley for carrying trays may be used the spacing between the trays must obviously be in keeping with the spacing between the inductors 8 there are many advantages of the process for reheating a meal according to the invention the trays are not touched from the time the trolleys are delivered to the place of consumption to the time they are served to the customers 4 improvement in.