This Optimus U-31001 ultrasonic humidifier puts out up to 1.5 gallons in 18 hours, ensuring your living area stays comfortable. The adjustable mist control allows you to set an ideal moisture level.
I bought this when my little one fell ill and doctor advised that her room needs humidification. After reading some good reviews over the internet I bought this. I am glad I made a good decision because 1) it is absolutely no-noise, 2) it doesn't necesaarily need distilled water - I have been using normal tap water for couple of months 3) since the tank is big, one fill can go for 2-3 nights.