The LEVOIT Classic300S has a pretty impressive runtime on a full tank. According to the manufacturer, it can last up to 60 hours with its 6-liter tank, though the actual time will depend on the mist setting you use and the room conditions. So, on lower settings, you might see it running for a couple of days before needing a refill.
Instead of a traditional built-in timer, this humidifier uses the VeSync app to control its operation. The app lets you do things like turn it on and off, tweak humidity levels, and switch between modes like Auto and Sleep. Some folks find the app super handy, but according to our research, not everyone finds it easy to navigate.
There have been some hiccups with automation features, which can be annoying if you're relying on it for scheduling.
For those who really want precise scheduling, you could use an external timer plug, but that won't sync with the humidifier's smart features. Overall, the LEVOIT Classic300S is well-liked for its long run times and smart options, even though the app might need a bit of patience and practice.
It's a popular pick, especially if you're okay adapting to its app-based controls.
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How we researched this
Where this comes from: this answer draws on the product's published specifications and the reviews ShopSavvy collected for it, alongside prices from 5 retailers in ShopSavvy's price data, most recently seen May 26, 2025.
📚More About LEVOIT Classic300S Humidifier
Where to Buy
| Retailer | Price | Last seen | Buy |
|---|---|---|---|
| $19.39 | May 26, 2025 may have changed | ||
| $64.91 | Oct 7, 2024 may have changed | ||
| $74.99 | Nov 29, 2024 may have changed | ||
| $79.99 | Oct 7, 2024 may have changed | ||
| $119.88 | May 26, 2025 may have changed |
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