Regenerators are used in catering for heating up ready dishes or frozen products, for maintaining the required temperature of ready meals, as well as for preparation of various side dishes, etc. For optimal results, in regenerators it is provided the ability of humidity control. Herewith, dishes may be served either on plates and as well in gastronorm containers, and for bringing them to the optimum temperature there is no need to add fat. The impact of the regenerator on ready-made meals and frozen foods does not lead to loss of natural flavor and color and gustatory quality. Products which are defrosted using a regenerator in their quality are very close to refrigerated products, but the process itself is quite short in time, and weight loss is absolutely eliminated.