What type of appliance is designed specifically to dry wet laundry?

The type of appliance designed specifically to dry wet laundry is a clothes dryer. This appliance uses various methods, such as heat and airflow, to remove moisture from clothes, allowing them to dry efficiently. Clothes dryers typically operate by tumbling clothes in a drum while circulating heated air, which evaporates the moisture and expels it outside, or condenses it into water for drainage, depending on the model.

A boiler is primarily used for heating water or providing heat for a building, and is not intended for drying clothes. A heat exchanger transfers heat between two or more fluids but does not perform drying functions as a standalone device. A heating element is a component that converts electrical energy into heat and can be part of various appliances, including clothes dryers, but it does not function independently to dry laundry. Therefore, the specific design and function of a clothes dryer make it the correct answer.