A device for recovering, harnessing and reutilizing heat from along a side wall of a cooking vessel, a cooking vessel comprising such device, and a method of using such device. The device can be constructed as part of the cooking vessel or can be an accessory that attaches to different sized cooking vessels via adjusting means. Specifically, the device is made of a highly conductive and durable metal or metal alloy and comprises a skirt-like body, extending from the side of the cooking vessel and attached to a perforated slip-like portion that may be attached to or integrated into the side wall of the cooking vessel. The device harnesses and reutilizes heat from the underside of the body and safely and efficiently transfers the heat to the cooking vessel through conduction. The device can further comprise diffusers, a bottom portion with a plurality of ventilation openings, and a heat shield.