The more trays that are added, the further the food is away from the heat, dramatically increasing the drying time, and requiring frequent tray rotation day and night to prevent spoilage. Round Stackable Units Heating unit in bottom. Spills fall directly on electric components. Vertical drying requires tray rotation as trays closest to heat source dry first. Units without fan or thermostat may spoil food or not dry at all.
Round design cuts off corners and has holes in center, reducing usable drying area.
Non-adjustable stackable design restricts size of drying chamber. Take a look at our dehydrator comparison chart .