IER humidifier by steamOvap® is an electric steam generator thatuses water immersed resistive heating elements to produce pure and sterile steam that is easy to distribute in air handling unit orventilation duct. IER humidifier can be supplied with tap or treated water such assoftened or reverse osmosis water. When tap water is used, the scale will comes off the heating elements by the naturalcontraction and expansion of the tube heaters. Scale pieces thenaccumulate at the bottom of the cylinder without the risk of clogging the drain outlet.