— Halogen. Halogen heaters in air fryers use an incandescent spiral placed within a glass tube filled with a special halogen gas. These heaters offer several advantages, including minimal thermal inertia, instant heating and cooling, and powerful heat radiation. They are capable of creating a characteristic fried crust on dishes, although heating may be less uniform, requiring the occasional flipping of the food in some models. The presence of the hot spiral also provides visibility into the cooking process and adds an aesthetic appeal to the device. The glass tubes used are chemically inert and resistant to corrosion. However, they are prone to brittleness, have a relatively shorter lifespan, and there is a small possibility of cracking if dirt accumulates on the tube due to uneven heating. Nonetheless, when operated according to the guidelines, these factors are not of significant concern. Consequently, "halogen" heaters are commonly found in most modern air fryers.
— Electric (heating element). Heating elements in air fryers consist of a heating coil encased in a metal tube filled with a thermally conductive insulating material. These elements offer several advantages, including strength, reliability, and durability. However, they have slower heating and cooling times compared to halogen tubes, and regular cleaning is required to prevent corrosion caused by prolonged contact with dirt. It's important to note that heating in these air fryers primarily occurs thr
...ough convection, which makes them less ideal for frying purposes. For more even and powerful cooking, some models provide for 2 or even 3 heaters.The capacity of the deep fryer basket or multi-oven bowl, or air fryer flask (see "Type") in kilograms is the maximum amount of food that can be loaded into the device at one time.
For deep fryers used in everyday life, a capacity of up to 0.6 – 0.8 kg is considered quite sufficient; it is rarely useful to fry numerous foods at a time at home. But models that can hold from a kilogram or more are designed mainly for industrial use — in cafes, canteens, etc. In turn, multi-ovens with a capacity of up to 0.8 kg can be called small, up to 1.5 kg — medium, more than 1.5 kg — large. Air fryers have approximately the same capacity.
