Levoit Classic 300S review
A 6 L top-fill cool-mist humidifier with app control and an auto mode that holds a humidity target.
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The Levoit Classic 300S is an ultrasonic cool-mist humidifier with a 6 L top-fill tank, a 360° nozzle and VeSync app control. This page is based on manufacturer-published specifications and manuals plus aggregated owner reviews; we did not test the products ourselves.
Our verdict
For a bedroom, nursery-adjacent room or plant corner up to about 500 ft², the Classic 300S is an easy pick: long run time, top filling and a humidity target you can set in the app. Choose a warm-mist model such as the LV600HH if you want warm mist or a remote control.
Levoit Classic 300S key specs
| Spec | Levoit Classic 300S |
|---|---|
| Type | Ultrasonic, cool mist |
| Tank | 6 L (1.58 gal), top-fill |
| Max output | 300 mL/h |
| Rated room | 215–505 ft² (20–47 m²) |
| Max run time | Up to 60 h on low |
| Mist levels | Low, Medium, High, Auto |
| Auto mode | Holds 40–50% RH or a custom target |
| Smart features | VeSync app, schedules, timer, Alexa and Google Assistant |
| Noise | ≤30 dB |
| Rated power | 26W |
| Extras | Aroma pad, optional night light, 360° nozzle |
| Dimensions | 9.6 × 7.5 × 13.4 in |
| Weight | 4.3 lb |
| Warranty | 2-year limited |
Pros and cons
Pros
- Top-fill tank is easy to refill and clean
- Up to 60 hours on low
- Auto mode with a custom humidity target
- Low 26W power draw
- 2-year warranty
Cons
- Cool mist only
- Ultrasonic units can leave white dust with hard tap water
- Custom targets and schedules need the VeSync app
Who it suits (and who it doesn't)
Good fit
- Bedrooms and offices up to about 500 ft²
- People who want app schedules and a humidity target
- Indoor plants
Look elsewhere if
- Anyone who wants warm mist
- People who won’t use an app (most extras live there)
- Very large rooms
What to know before you buy
- Water: ultrasonic humidifiers can spread minerals from hard water as white dust. Distilled or demineralized water avoids it.
- Cleaning: the wide top opening makes regular cleaning easier; follow Levoit’s manual.
Related pages
- Levoit LV600HH review for warm mist.
- Best humidifier for plants.
Frequently asked questions
How long does the Classic 300S run?
Levoit rates it for up to 60 hours on low.
Does it work with Alexa?
Yes, through the VeSync app, along with Google Assistant.
Is it warm mist?
No. It is cool mist only.
Did you test it?
No. This page uses manufacturer specifications and aggregated owner reviews. See how we research.
Sources
Specifications were checked against the manufacturer pages, manuals and spec sheets below in October 2026. Makers revise specs and sell regional variants, so confirm the exact model number before you buy. We do not list prices because they change daily; use the retailer link to see the current price.
Keep reading
Best humidifier for plants
Tropical houseplants like 50–60% humidity, but most heated homes in winter sit far lower. A humidifier that can hold a target level and run all day matters most.
Read the comparison ReviewHumidifiersLevoit LV600HH review
A hybrid warm-and-cool-mist humidifier rated for big rooms, with a remote and an auto mode.
Read the comparison Head to headHumidifiersLevoit Classic 300S vs Levoit OasisMist 450S
Cool mist only with a bigger tank, or warm and cool with less run time.
Read the comparison Head to headHumidifiersLevoit Dual 200S vs Levoit Classic 300S
Small and light vs bigger tank and longer run time.
Read the comparison