Heat-pump condensing tumble dryer. The heat-pump is more efficient than normal resistive heat generation, and the moisture condenses on the cold parts of the h

Heat-pump condensing tumble dryer. The heat-pump is more efficient than normal resistive heat generation, and the moisture condenses on the cold parts of the heat-pump. So less power used, and less moisture in the air. Win-win. The drawback is the high initial cost of such dryers. But this one is still going strong, after 14 years so far. Ours was bought when we lived in a cold damp climate. We have since moved to a hot humid climate. Passive drying works best in a dry climate.