Levoit Classic 300S Ultrasonic Smart Review

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.

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, changing the humidity levels in our test room from 35.50% to 61%. 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.

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.

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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.

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.

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.

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.

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.

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.

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?