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Levoit Classic 300S Ultrasonic Smart Review

Extensive controls, smart home integration, and easy operation provide a trouble-free humidifier experience
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Levoit Classic 300S Ultrasonic Smart Review (We loved the user-friendly and smart-home features of the Levoit Classic 300S.)
We loved the user-friendly and smart-home features of the Levoit Classic 300S.
Credit: Abriah Wofford
Price:  $80 List
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Manufacturer:   Levoit
By Sentry Kelly and Ryan White  ⋅  Jun 12, 2024
85
OVERALL
SCORE


RANKED
#3 of 12
  • Effectiveness - 40% 9.2
  • Ease of Cleaning - 25% 7.0
  • Convenience - 20% 9.8
  • Run Time - 10% 7.9
  • Operation Cost - 5% 7.2

Our Verdict

The Levoit Classic 300S Ultrasonic Smart emerges as one of our top choices for convenience, boasting easy-to-use control buttons, a clear digital display, and consistent performance, plus key features that make operating and cleaning it a breeze. We also love that this unit comes with a night light and is incredibly quiet, making it perfect for kids or a nursery — and thanks to its smart app, parents can control it remotely. This convenience comes at a cost though, as the purchase price is similar to other high-performing options among our top-ranked humidifiers. The Levoit not only met our performance benchmarks but also distinguished itself with its user-friendly interface, effortless cleaning and filling, and capability to pair with smartphones and smart home devices. If you're looking for a small home appliance that provides the benefit of a humidifier with minimal hassle or maintenance, this model is for you.
REASONS TO BUY
User-friendly interface
Adjustable nozzle
Smart features
REASONS TO AVOID
Pricey
Water tank can be tough to carry

Compare to Similar Products

 
Awards Top Pick Award
Best for Kids
Top Pick Award
Best Premium Humidifier
Editors' Choice Award
Best Overall Humidifier
Best Buy Award
Best Bang for your Buck
 
Price $80 List
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Bottom Line A great choice for a humidifier with comprehensive controls, a smartphone app, and no-fuss filling and cleaningThis is one of the highest performing humidifiers on the market, impressing us with its high output and effortless operationThis device sits among the top performers due to its overall effectiveness and intuitive smart designAffordable, feature-rich, and effective, this humidifier is a great all around choiceIt doesn't have the most power, but this device gets the job done at an affordable price
Rating Categories Levoit Classic 300S... Honeywell HUL430 Levoit OasisMist 45... Dreo Smart HM311S Levoit Dual 150 Ult...
Effectiveness (40%)
9.2
9.5
8.9
7.0
5.8
Ease of Cleaning (25%)
7.0
8.0
8.0
7.0
7.0
Convenience (20%)
9.8
8.5
9.8
10.0
7.5
Run Time (10%)
7.9
7.2
5.0
6.9
9.5
Operation Cost (5%)
7.2
8.0
9.1
7.8
6.0
Specs Levoit Classic 300S... Honeywell HUL430 Levoit OasisMist 45... Dreo Smart HM311S Levoit Dual 150 Ult...
Capacity 1.6 gal 1.3 gal 1.2 gal 1.0 gal 0.8 gal
Coverage Area 505 sq. ft. Medium Room 430 sq. ft. 300 sq. ft. 290 sq. ft.
Built in Humidistat Yes No Yes Yes No
Measured Noise (Low) .6 dBa 1.5 dBa 4.0 dBa 1.0 dBa .5 dBa
Measured Noise (Medium) 1 dBa Mode 2: 1.7 dBa
Mode 3: 1.9 dBa
4 dBa 2 dBa 1 dBa
Measured Noise (High) 2 dBa 2 dBa 5 dBa 3 dBa 1 dBa
Nightlight Yes Yes No Yes No
Sleep Mode Yes No Yes Yes No
Available App Yes No Yes Yes No
Modes 1-3, Auto 1-4 1-3, Auto 1-3, Auto Dial
Relative Humidity Range 30-80 None 30-80 30-90 None
Warm Mist No No Yes No No
Auto Shutoff Yes Yes Yes Yes Yes
Filter Required Optional No Optional No Optional
Aromatherapy Capable Yes Yes Yes Yes Yes
Removable Tank Yes Yes Yes Yes Yes
Top Fill / Bottom Fill Top Bottom Top Top Top
Humidification Technology Ultrasonic Ultrasonic Ultrasonic Ultrasonic Ultrasonic
Manufacturer Dimensions 13.4" x 9.6" x 7.5" 13.2" x 8.8" x 8.8" 12.0" x 6.0" x 10.8" 10.2" x 11.0" x 5.5" 11.6" x 7.2" x 8.1"
Weight 4.3 lbs 6.6 lbs 5.3 lbs 3.0 lbs 3.0 lbs
Run Time (High) 22 hr 19 hr 9 hr 18 hr 29 hr
Relative Humidity Change 1 hr 71.8% 74.4% 68.8% 52.2% 41.8%

Our Analysis and Test Results

The Levoit Classic 300S Ultrasonic Smart offers multiple features, enhancing the user experience and providing consistent performance. When it comes to convenience and usability, this model is one of our top choices and has one of the highest overall performances of any model in our comprehensive testing process. However, other similarly priced options performed better at a high-end price point, although these may sacrifice ease of operation or cleaning. Read on to see where it shined in each of our individual test categories.

Performance Comparison


We love that the Levoit Classic 300S comes with a mode for our plants.
Credit: Matt Lighthart

Effectiveness


Our testing process is comprehensive and we made sure to put each device through the proper paces to fully assess overall effectiveness. Basically, we tested each humidifier in a controlled 150 sq. ft. room and ran them on high for a minute to see how much they could change the relative humidity. In the highest output mode, the Levoit Classic 300S Ultrasonic Smart managed to soar through this test, giving a 71% change in humidity. This is an impressive showing for the Levoit. The claimed coverage area is 505 sq. ft., and we don't doubt its efficiency in a bigger space. Like most humidifiers, you also have the option to add essential oils to an included aromatherapy pad, enabling it to perform as a double-duty diffuser.


According to manufacturer instructions, the Levoit Classic 300S Ultrasonic Smart should be placed at least 12 feet from the walls to avoid issues with the built-in humidity sensor. We noticed a slightly higher reading from the built-in humidity sensor when compared to the industrial humidity meter used in our testing process.

levoit classic 300s ultrasonic smart - the levoit classic 300s easily met our performance benchmarks.
The Levoit Classic 300S easily met our performance benchmarks.
Credit: Abriah Wofford

Ease of Cleaning


The Levoit Classic 300S Ultrasonic Smart was a standout performer in its hassle-free cleaning, which earned it high marks thanks to a removable lid on the water tank that provided unfettered access to clean all areas of the tank with ease. The advantage of a removable lid enabled our testers to see and reach in and clean all the corners and crevices of the tank. Even our testers with larger hands had no issues reaching inside the tank for cleaning. This model was also the only one we tested that included a cleaning brush in the package, adding the ability to clean the tank more thoroughly.


The manual recommends never using a dishwasher, detergents, or immersing the base of the unit in water when cleaning. Instead, it instructs users to follow a detailed process involving swirling water in the tank and soaking components in a white vinegar solution for a total of 30 to 40 minutes. It took us a full 45 minutes, including the soaking time, to follow the instructions step by step. However, the fully accessible water tank and removable parts make it easy to access all areas that need to be cleaned.

The fully removable lid allows for complete access to the water...
The fully removable lid allows for complete access to the water reservoir.
The cleaning brush allows for easy cleaning of the Levoit Classic...
The cleaning brush allows for easy cleaning of the Levoit Classic 300S.

Convenience


For this metric, we aimed to assess several factors. Firstly, we evaluated whether each device is equipped with a humidistat, which regulates the output level of the humidifier based on the room's relative humidity. Additionally, we examined if the machine incorporates any smart features, such as a companion app or nighttime mode, and assessed the ease of controlling it through the interface/buttons. Lastly, we determined whether each model features a top or bottom fill tank.


Once again, the Levoit Classic 300S Ultrasonic Smart stands out from its competitors due to its exceptional usability. The unit features four buttons on its body, which control power, sleep mode, light (with two brightness settings), and intensity (offering auto, low, medium, and high options). A digital screen situated in the center of the device provides real-time information on the current humidity level, device settings, and displays a refill needed indicator if the tank is empty.

levoit classic 300s ultrasonic smart - individual control buttons and a digital screen display current...
Individual control buttons and a digital screen display current settings and enable easy operation.
Credit: Abriah Wofford

Although this model doesn't include a remote control, you have the option to connect it to your smartphone using the free and user-friendly VeSync app. Once connected to your Levoit Classic 300S Ultrasonic Smart, you can conveniently control the light, intensity, timer, and scheduler, as well as access real-time settings and humidity percentage from your smartphone. If enabled, the app will send notifications to your phone when the device requires cleaning or refilling. If you're looking to expand your range of smart home devices, you will be pleased to find that the Levoit Classic 300S also pairs with Amazon Alexa and Google Assistant, enabling you to control humidifier settings with your voice.

levoit classic 300s ultrasonic smart - the vesync app offers complete control of the levoit classic 300s...
The VeSync app offers complete control of the Levoit Classic 300S and can function as a remote control.
Credit: Abriah Wofford

Filling and cleaning the 300S is easy, thanks to several key features and a unique design element. While the 1.2-gallon and 7.5-inch high water tank is larger than others, two recessed handles located on either side of the tank make carrying and holding it easy, even when full. Furthermore, thanks to the completely removable tank lid that yields a 6-inch opening at the top of the tank, it's easy to fill from most sinks. The top-filling nature prevents the need to ever flip the tank for filling or installation, and our testers were pleased to note no spills or splashes when carrying the full tank or reinstalling it on the base of the unit.

levoit classic 300s ultrasonic smart - the levoit classic 300s ultrasonic smart proved very easy to fill.
The Levoit Classic 300S Ultrasonic Smart proved very easy to fill.
Credit: Abriah Wofford

As an impressive bonus feature, this model offers a “Plant Care” mode. With this feature, you can specify the type of plants you're cultivating, and the humidifier will automatically adjust the room's humidity to the ideal level for those plants. It also creates a customized watering schedule to remind you when to water your plants. This convenient add-on could potentially sway users who prioritize plant care and appreciate the ability to optimize their indoor environment for plant growth.

levoit classic 300s ultrasonic smart - the levoit classic 300s's recessed handles and lid supported...
The Levoit Classic 300S's recessed handles and lid supported comfortable carrying of the tank without any splashes, even when full.
Credit: Abriah Wofford

Runtime


The Levoit Classic has exceptional runtime in our testing. In order to evaluate run time, we filled the humidifier base with the minimal amount of water required to operate. Once the humidifier stopped we placed an additional 50 ml of water directly into the base. Afterward, we recorded the duration until each device shuts off on each setting offered.


The Levoit Classic model offers low, medium, and high settings. We tested it on each setting, and the runtimes were 41 minutes (low setting), 17 minutes (medium), and 11 minutes (high), respectively. Due to the high output by the Levoit, this is a solid performance.

levoit classic 300s ultrasonic smart - the levoit classic 300s ultrasonic smart outputs humidity with the...
The Levoit Classic 300S Ultrasonic Smart outputs humidity with the best of them, in a relatively short amount of time.
Credit: Abriah Wofford

Operating Cost


In order to determine the overall cost of operation, we plug the humidifier in using the kilowatt meter and record the power consumption. We then calculate the cost using the most up to date national average for cost/kwh


Its power consumption isn't ultra economical, using 0.4 kWh per day — which is not the cheapest option available. It'll cost you about an estimated $3.16 per month to run daily on the highest setting. Of course, usage cases will vary greatly.

levoit classic 300s ultrasonic smart - we loved the user-friendly and smart-home features of the levoit...
We loved the user-friendly and smart-home features of the Levoit Classic 300S.
Credit: Abriah Wofford

Should You Buy the Levoit Classic 300S Ultrasonic Smart?


Offering premium and ergonomic features, we feel the Levoit Classic 300S Ultrasonic Smart is a top choice for users who want a stress-free humidifying experience. If you're looking for an option that takes as little time as possible away from your day for programming, filling, and cleaning, this is the model for you.

What Other Humidifiers Should You Consider?


Levoit makes some of the best humidifiers on the market today, and for a little more cash upfront, you can get the Levoit Oasis Mist 450S Smart. Even though you'll be spending more initially, this model has a lower overall operating cost. If you're looking to spend less, the Dreo HM311S performed superbly in our testing, notably in terms of convenience. It's not quite as effective, but still a solid contender nonetheless. If you want the most humidifying power, the Honeywell HUL430 is a stellar machine, but it'll cost you a bit more.

Sentry Kelly and Ryan White