Economical and environmentally friendly drying Miele has reduced the electricity consumption of its tumble dryers by more than 60 % in recent years. All tumble dryers from the new T1 generation feature energy-efficient heat pump technology. With EcoSpeed, you can dry your laundry quickly and in a way that is kind to the environment, with the best energy efficiency class A+++. Furthermore,br many Miele tumble dryers are equipped with the refrigerant R290, which is completely HFC-free – for an even better environmental performance.