PowerPure 6000 Utrasonic Top Fill Humidifier Humidifies up to 900 Square Feet; Features a 1-Year Manufacturer Warranty Ultra-Quiet Operation; Emits up to 2.8 Gallons Per Day Reservoir Holds 1.6 Gallons of Water for All Day Operation No Expensive Filters! Features a Permanent Ceramic Filter that Softens and Keeps Water in Reservoir Fresh Top Fill Design - No Need to Carry Tank to Fill It; Digital Display