Copper cookware keeps food warm more efficiently than stainless steel cookware. Because copper conducts heat up to 25 times better than stainless steel, it is not only a superior material as a food warmer but also for cooking and roasting because the heat can be regulated more precisely.
Heat spreads more evenly and is stored more effectively in copper cookware than it is in stainless steel cookware, making copper cookware superior for keeping food warm longer. Copper is also preferred by chefs for cooking in general because it is more hygienic, durable and resistant to corrosion than stainless steel. Copper is toxic to many germs and bacteria but harmless to humans.