A dishwasher including a tub forming a washing chamber; a drying device disposed outside of the tub and including an inlet through which air from the washing chamber is introduceable, a flow channel in which air from the washing chamber introduced through the inlet flows, a fan that is operable to cause air from the washing chamber to be introduced through the inlet to flow in the flow channel, a heater in the flow channel to heat air in the flow channel, an outlet through which air in the flow channel is discharged to the washing chamber, and a temperature sensor between the heater and the outlet; and at least one processor configured to operate the fan based on a start of a drying cycle and to determine an initial operation time point of the heater during the drying cycle based on temperature detected by the temperature sensor.

A dishwasher includes a tub having a top wall and opposing sidewalls that at least partially define a washing chamber. A housing coupled to the top wall of the tub. A motor disposed in the housing. A lead screw operably coupled to the motor, the lead screw extends between the opposing sidewalls of the tub. An air knife assembly is operably coupled to the lead screw. The air knife assembly is operable between a stowed state and a deployed state. The motor drives rotation of the lead screw to move the air knife assembly, the air knife assembly including, an air knife defining an air inlet and an air outlet, and a blower coupled to the air knife. The blower is configured to direct air through the air outlet of the air knife to generate an air curtain when the air knife assembly is in the deployed state.