Aprilaire 400 Humidifier
The Aprilaire Model 400 bypass humidifier is the newest addition to the line. It uses new evaporative technology to minimize water use, eliminate standing water and provide comfortable humidified air ...
Pros: Uses less water. Does not need to be drained to a sewer for normal operation.
Cons: Costs more, Requires twice the maintenance as the Aprilaire 500 or 600.