The tankless design, which has been added to the manufacturer’s line of water wall systems, uses advanced water control, sterilization, and heating control technology to achieve optimal humidity for indoor comfort and preservation. Elimination of the water-heating reservoir saves customers money in electricity costs and purchase price. According to the manufacturer, the company’s line of products humidifies when the built-in sensor on the control panel detects that the indoor air is too dry and activates a heating element that warms the water in the Humidity Engine™ reservoir. The warm water creates evaporation from the in-wall or transparent panel. Evaporation is the cleanest, safest kind of humidity because particles of all types remain in the water and don’t go into the air, claimed the company. The units can be installed in residential and commercial applications.