When the air fryer is running, the air in the fryer is heated by the heating pipe, and then the air flow is accelerated by the fan, so that the moisture of the food becomes dry and the food becomes hot, and then the frying effect is produced. In fact, most air fryers do not need to add water during use. However, friends who like to cook food know that food will be more tender if it can be supplemented with water and generate steam during cooking. The bottom of the air fryer is generally designed as an oil-holding chassis, where most of the fried oil will gather. At the same time, it can also drain water, so that the water loss of food is not too serious and the taste is not firewood. But there are also many air fryers with their own water tanks. There is usually a small box on the side wall or bottom of the machine.