The Helios KWL-EVH 200/300 W is an electrical preheater unit that offers simple plug-in installation, designed to preheat intake air during extremely low outdoor temperatures. It provides effective protection against heat exchanger icing, ensuring smooth and efficient ventilation system operation. This preheater is mandatory for passive houses, where precise climate control is critical. With a heating output of 1000 W, it delivers reliable and energy-efficient performance for maintaining optimal indoor air quality in cold conditions