The Aprilaire® Model 400 automatic humidifier uses a patented water delivery system, which includes a small float chamber, electronic water level sensors, and a wicking water panel. Employing the float chamber eliminates the need for a reservoir, while the wicking panel allows for 100% of the water in the unit to be used in the evaporation process with virtually no standing water, the manufacturer states. According to the company, this model uses a maximum of 8 ounces of water to operate. This humidifier comes with a built-in bypass damper and automatic humidifier control. It replaces Models 445 and 448 recirculating humidifiers.

Research Products Corp., P.O. Box 1467, Madison, WI 53701-1467; 608-257-8801; (website).

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