Levoit Classic300S Smart Cool-Mist Humidifier, 6 L Top-Fill, Up to 60-Hour Runtime

With a 6 L tank, the Levoit Classic300S is designed to humidify bedrooms and larger home spaces. Its top-fill design makes adding water straightforward. App and voice controls help you manage settings around your routine. Want humidity control that adapts through the day?

Getting the most from it

Use Auto Mode to let the humidifier’s sensors adjust operation in response to room humidity, or set a schedule and timer through the VeSync app. The 6 L capacity supports up to 60 hours of operation on the lowest output setting, so it can run for longer between refills in that mode. For a hands-on routine, the top-fill opening provides direct access when it’s time to add water, and the included cleaning brush supports regular cleaning.

The Classic300S also works with Alexa and Google Assistant for voice control. Set it up in the app to adjust settings remotely or organize operation around the times you’re home, at work or asleep. Its ultrasonic cool mist and coverage of up to 505 ft² make it suitable for a bedroom or a larger room where you want humidity managed beyond a small bedside area.

Where it shines

This model suits a room that needs humidity support throughout the day, with controls that can change to match different activities. Use Auto Mode during shared family time, Plant Mode for plant care, or Sleep Mode overnight. The 360-degree rotating nozzle lets you direct the mist, while the night light adds a soft lighting option. If you prefer a darker sleep environment, the display light can be turned off.

The aroma tray brings aromatherapy into the same setup, making it possible to add fragrance while the humidifier runs. For a typical bedroom routine, you could schedule operation before bedtime, switch to Sleep Mode overnight and use the top-fill tank for the next refill. Buyers frequently praise its quiet operation and easy filling, while feedback on performance is mixed, those experiences are individual rather than a guarantee of a particular result.

Key features

The Classic300S combines a generous water capacity with smart controls, so it can suit people who want fewer manual adjustments as well as those who prefer to set their own schedule. Its automatic humidity sensing provides a different approach from a basic humidifier that relies entirely on manual settings. The app and voice options add flexibility, while the top-fill design keeps routine refills simple.

The humidifier is rated for rooms up to 505 ft² and has an ultrasonic operating mode. Sleep Mode, the switchable display light and the night light let you tailor its presence in a bedroom. Along with the aroma tray and rotating nozzle, these features make it adaptable for everyday home use, from plant care to overnight operation.

Questions before you buy

How long can it run between refills? The 6 L tank supports up to 60 hours at the lowest output setting. Actual runtime depends on the selected output.

Can I control it without using the onboard settings? Yes. It supports the VeSync app and voice control with Alexa and Google Assistant, scheduling and timer functions are also available.

Can I use it in a bedroom at night? Sleep Mode is intended for overnight use. The display light can be turned off, and the humidifier also has a night light for a softer lighting option.

Buying verdict

Choose the Levoit Classic300S if you want a smart cool-mist humidifier with a 6 L top-fill tank for a bedroom or larger room. Auto Mode, app and voice control, plus dedicated sleep and plant settings, make it a practical fit for changing household routines.