An AGA is a type of heat-storage stove and cooker made of cast iron. It was invented in 1922 by Gustaf Dalén, a Swedish physicist, and was initially produced in Sweden. Since 1957, most production has been located in the UK. The AGA range cooker was developed to burn coal or anthracite, and it combines a heat source, two large hotplates, and two ovens into one unit. The heavy cast-iron frame absorbs heat from a relatively low-intensity source, and this heat is then transferred to the ovens and hotplates for baking, roasting, and frying. AGAs have no temperature controls and are left on continuously. They have two hotplates, a burner, a simmering oven, a roasting oven, a baking oven, and a warming oven. AGAs are known for their distinctive appearance and are considered a design classic symbolizing quality and craftsmanship.