Comparison Ninja Double Stack XL Air Fryer SL400 vs Ninja Foodi MAX Dual Zone Air Fryer AF400

— 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.

— Rotary switch. Control carried out by mechanical elements directly connected to the corresponding components of the device. The traditional, most popular option provides two rotary knobs: a thermostat and an off timer with a clock mechanism (see “Functions”). The main advantages of this type of control are simplicity and low cost. At the same time, the capabilities of the “mechanics”, although modest, are quite sufficient to control all key functions. Among the clear disadvantages compared to electronic control, it is worth noting less accuracy.

- Push-button. Push-button control is based on electronic circuits. Such systems are more accurate than mechanical ones; more capabilities and modes are provided. On the other hand, such control is more complex and more expensive than mechanical control.

- Touch. A type of electronic control with touch switches. Compared to push-button models, it provides a high level of comfort in operation, and looks more modern and aesthetically pleasing. Touch control is found mainly in top models of juicers.

— Rotary switch with sensor. Another type of electronic control, where the main control is a rotary switch, which is complemented by touch buttons. The switch itself simplifies the selection of modes, temperature, timer time, and the sens...ors are secondary. However, the control panel itself looks stylish and is not inferior in design to models with touch controls only.