Abstract: A cover having the form of a bell with double wall and space between the walls, for maintaining the cooking temperature of food, which is placed over a burner of a kitchen stove or the like and which prevents the hot air from escaping from the vicinity of the burner, forming a first chamber which maintains a substantially uniform temperature therewithin and with a second enveloping chamber formed by the double wall, which also admits hot air around the lower edge passing into the space between inner and outer wall thus increasing the efficiency of the conservation of heat within the inner chamber, which permits rapid cooking of the food with the use of less fuel or heat.