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Ever since I discovered that my stuffy nose and sinus pressure was due to the dry air in my home, and not allergies, a humidifier has been an essential fixture of every one of my major living areas.
And now that I’ve had plenty of time to experience the gentle mistings of a basic humidifier, more things to consider have presented themselves, like ease of cleaning the device, and the harm of over-humidifying. Yes, it’s possible to have too much humidity, which can promote the growth of bacteria or mold.
My quest to address these important issues has led me to the Classic 300S Smart Ultrasonic Humidifier by Levoit. Let’s take a closer look at how this advanced humidifier helps maintain a more comfortable and cleaner experience.

Product Snapshot: Levoit Classic 300S Smart Ultrasonic Humidifier

levoit humidifier

Credit: Levoit

The Classic 300S Smart Ultrasonic Humidifier from Levoit offers modern convenience and automatic operation thanks to its app and WiFi-enabled features, a large top filling tank, and built-in humidity sensor.
Things I like: 

  • Automatic humidity control shuts off device to prevent over-humidifying
  • Can be used without the Vesync mobile app
  • Large top filling tank
  • Easy to clean
  • Very quiet operation
  • Built-in night light
  • Sleep mode that turns off all illumination sources

Things to keep in mind:

  • A 6-liter tank means a larger footprint

Key Features/Specs:

  • Whisper-Quiet Operation: ≤ 30dB
  • Effective Range: 215–505 ft² / 20–47 m²
  • Material: BPA free, suitable for babies and adults
  • Extra Large Water Tank of 6L
  • Operation that Lasts Up to 60 Hours, 7 Nights of Sleep
  • Essential Oil Tray
  • 360 Rotating Nozzle

$69.99 at Amazon

My Experience with the Levoit Classic 300S Smart Ultrasonic Humidifier

At its core, Levoit’s smart humidifier accomplishes what other ultrasonic humidifiers do – send an ultra-fine mist of moisture into the air that doesn’t leave wet messes behind. But what makes it stand out, even if you don’t use any of the smart functions, is its ease of maintenance. I’ve said goodbye to a number of humidifiers because at some point, I’m not able to reach into the tank or its crevices to remove gunk and build-up.

levoit humidifier

Credit: Slickdeals

The Classic 300S addresses this with a large lid and opening at the top of the removable water tank, which also lets you conveniently refill water without moving the device. There’s zero potential for spills since I’m not flipping the tank over to access the fill opening (like I have to do other humidifiers), and with the capacity to hold up to six liters of water, I can go quite a few days without needing to worry about refilling.
Managing an optimum level of humidity is as simple as pressing the power button. The Classic 300S’s built-in humidity sensor defaults to a max humidity of 50%, and will automatically start and stop the operation depending on the environment. This is especially helpful for me because I fall asleep better when the air isn’t dry, and I don’t want the humidifier running non-stop for eight hours. Of course, you can always set it to manual mode – low, medium, or high – if you’d prefer a continuous mist.
And best of all, the Classic 300S is so quiet when it’s running that I often forget that it’s even there. (Another reason that the auto-off function is useful!) I’ll often go upstairs for bed, and realize that I didn’t turn off the humidifier. That’s ok, though, because the free Vesync app provides remote control of the humidifier, and integrates seamlessly with Alexa or Google Assistant. I can ask Google Assistant to turn off the humidifier, or make it part of my bedtime routine – turn off the lights, play soothing sounds, turn off the living room humidifier.
Levoit also added an adorable little night light inside the tank, which illuminates the water. But for those who are sensitive to light when sleeping, all illumination can be turned off, including that of the front display.

Should You Buy the Levoit Classic 300S Smart Ultrasonic Humidifier?

levoit humidifier

Credit: Levoit

Levoit’s Classic 300S Smart Ultrasonic Humidifier is so quiet and so well designed for easy access and cleaning that just these enhancements alone are worth the extra cost compared to other humidifiers.
But the feature that really seals the deal for me is its ability to prevent over-humidifying a room. Having too much moisture in the air over a long period of time can lead to health issues, so I really like the peace of mind that the Classic 300S provides.

Shop Levoit Classic 300S


Andrew Chen

Editorial Content Manager Andrew Chen is a longtime PC gamer, an automotive journalist and an avid deal hunter. His first PC had an 80 megahertz processor with 4 megabytes of RAM, light years away from the powerhouse gaming rigs he builds today. You can follow Andrew's high-speed sports car adventures over at As a Slickdealer for over 10 years, nothing makes him more excited than getting a freebie! Chat with Andrew on Twitter: @slickdealsdrew