Home / Home & Kitchen · Product overviews / Heating, Cooling & Air Quality / Humidifiers · More from LEVOIT
LEVOIT Classic 300S 6L Smart Humidifier: features, specs and who it suits
A 6-litre top-fill ultrasonic cool mist humidifier with app and voice control, auto and sleep modes, and an essential oil tray. What the specs mean.
This page contains an affiliate link, marked as such. If you buy through it, Bloiq may earn a commission at no extra cost to you.
The LEVOIT Classic 300S is a 6-litre ultrasonic cool mist humidifier with app and voice control. It is made for bedrooms and larger living spaces where winter heating leaves the air dry, and it fills from the top so you don't have to flip the tank.
Tank size and run time
LEVOIT gives the tank as 6 L and says it can run for up to 60 hours, which it describes as about seven nights of sleep. Run time depends on the mist setting, so that figure is typically for the lowest output. The unit measures 9.6 x 7.5 x 13.4 inches (24.5 x 19.2 x 34 cm) and weighs about 4.4 lb (2 kg) empty.
Coverage and mist output
The brand lists an effective range of 215-505 sq ft (20-47 m²) and says it humidifies four times faster than earlier models. Coverage figures assume a typical closed room, and a larger, draughtier space may need more than one unit. A 360° rotating nozzle directs the mist.
Auto, sleep and plant modes
Auto mode uses a sensor to hold humidity near a level you pick. Sleep mode lowers output and noise, and LEVOIT quotes noise of 30 dB or less. Plant mode is for rooms with houseplants. Humidity sensors in small humidifiers are a guide rather than a laboratory reading, so a separate hygrometer can help if you want precision. The display light can be turned off fully.
Smart control
With the free VeSync app you can change settings, set schedules and control the unit from elsewhere. LEVOIT also lists voice assistant support.
Top fill and cleaning
Top filling means you pour water straight into the tank without removing it. The brand says this avoids leaks and makes cleaning easier, and a cleaning brush is included. Distilled or purified water is recommended in the listing, and typically reduces white mineral dust and scale. Clean the tank and base regularly, as the manual describes.
Essential oil tray
An oil tray lets you add essential oils. LEVOIT suggests using its aroma pads so the scent is stronger and the fragrance box is protected, and it sells replacement filters separately. Use only oils and amounts the manual allows.
Safety features
The unit shuts off automatically when it runs out of water, and the listing states ETL certification. As with any plug-in appliance, follow the manual on placement and power.
Who it suits
It suits people who want a larger-tank, low-noise unit for a bedroom or living room, and who like scheduling through an app.
What to check before you buy
- Room size: compare the 215-505 sq ft range with your room.
- Placement: put it on a level, water-safe surface at a sensible height.
- Water: decide whether you'll use distilled water and how you'll handle scale.
- Wi-Fi: confirm your network is compatible with the app.
- Parts: check which filters and aroma pads fit and how often you'll replace them.
- Cleaning: be ready to clean it often, as the manual advises.
The short version
- A 6 L top-fill ultrasonic cool mist humidifier.
- Up to 60 hours of run time and 215-505 sq ft coverage, as rated by LEVOIT.
- Auto, sleep and plant modes, with noise of 30 dB or less.
- VeSync app and voice control, essential oil tray, auto shut-off.
Bloiq is reader-supported. Some links may earn us a commission; it never affects what we write. How we make money.
