The Helios KWL-EVH 170 W is an electrical preheater unit designed for easy plug-in installation, providing reliable preheating of intake air during very low outdoor temperatures. This prevents icing on heat exchangers, ensuring continuous and efficient operation of ventilation systems. It is especially essential for passive houses requiring strict climate control. With a heating output of 1000 W, this preheater offers effective protection and energy-efficient performance for cold weather conditions