Beats a clothesline on energy efficiency. Seriously.
Drying laundry items indoors on a rack or over the radiator is not only slow but also introduces a lot of water into the air. And moisture equals mould. Open a window, problem solved? No, because you’ll probably have to reheat or air-condition the room, which will consume more energy than a Bosch heat pump dryer. That’s more than earning our excellent energy efficiency class rating.