Wall ovens make it easier to work with large roasting pans and Dutch ovens. A width is typically 24, 27, or 30 inches. Mounted at waist or eye level, a wall oven eliminates bending. However, it can be nested under a countertop to save space. A separate wall oven is expensive compared with a range.
Ovens also vary in the way that they are controlled. The simplest ovens (for example, the AGA cooker) may not have any controls at all; the ovens simply run continuously at various temperatures. More conventional ovens have a simple thermostat which turns the oven on and off and selects the temperature at which it will operate. Set to the highest setting, this may also enable the broiler element. A timer may allow the oven to be turned on and off automatically at pre-set times. More sophisticated ovens may have complex, computer-based controls allowing a wide variety of operating modes and special features including the use of a temperature probe to automatically shut the oven off when the food is completely cooked to the desired degree.
Wall Oven known as an oven, toaster, oven, refers to a device with a hot air cooking food, usually enclosed or semi-enclosed structure. In the open form with hot air heating is called barbecue. Ovens can also be used to refer to the hot gas of high temperature processing apparatus. In the West, traditional oven is a common device family kitchen, usually horizontal. In China Central Plains area, the food and beverage industry is traditionally used instead of the home, mostly vertical. Ancient Chinese oven is not common, it may be a result of insufficient fuel. Traditional ovens use wood, coal combustion heating. Modern oven is more use of electric or natural gas, and with automatic thermostat system.
More recently, ovens have become slightly more high-tech in terms of cooking strategy. The microwave as a cooking tool was discovered by Percy Spencer in 1946, and with the help from engineers, the microwave oven was patented. The microwave oven uses microwave radiation to excite the molecules in food causing friction, thus producing heat