Classic 300S Ultrasonic Smart Humidifier

This humidifier works well and is very quiet. No dripping or gurgling sounds. It does a good job of adding moisture to the air. I use it in my master bedroom with the door closed in the winter when the air gets bone dry. It’s also good bedside if you are congested. I highly recommend.

I thought night mode would be great..but so far it just turns it off completely. I thought it was supposed to put it in auto mode and keep the room at a certain humidity level. I live in the desert I know for sure my room is not at a 50% humidity level. So I'm pretty confused on how this is supposed to help my congested kids if it just shuts off all night. Guess I'll just keep the lights on the screen on. 🙃

Great humidifier. Just purchased my second one to keep in my cat’s nighttime bedroom (spoiled kitty!). The only criticism I have is that the humidity displayed runs about 4-5% lower than the actual humidity in the room so I recommend having a small, separate humidity meter to verify. Once you figure out how far off the machine is from reality, you can work backwards to set the auto feature to maintain what you want. I’ve seen a lot of complaints about the app malfunctioning, but I’ve never experienced that myself, and I’ve got four different devices from Levoit that I manage through the app (their air purifiers are awesome too!). Never had an issue unless my internet is on the fritz. I only wish they sold space heaters and dehumidifiers, then I could micro-manage my home air quality perfectly in the winter even when I’m at work.

I've had this about a week and it's really helped my dry sinuses. Like any humidifier you have to change the water once a day. Directions suggest distilled water but I'm using plain tap. They also recommend cleaning every 3 days but now that I see how involved and time consuming it is I'll be doing it once week. These decisions could reduce product life but at this price, I can replace every couple years.

Works great in the living room but it couldnt get the humidity right in my bedroom.
Easy to use and setup. The app works good and sends you an alert when the reservoir is empty.

The unit is really nice. Quit and compact. I don't like that it is only controlled by blue tooth. No other way to make adjustments. I will use it as look as I have wifi connection, but I will not purchase another one with blue tooth only connections.

I got this when my husband was getting sick and the air is super dry where we live and he was starting to get nose bleeds. It has defintely helped him recuperate. I love the feature of being able to add in essential oils as well. However I wish there was a way to replace the pad, because once it’s saturated and has been used maybe twiece, it starts to smell funky and you can’t take the pad out to rinse out the old oil that was used. Overall, not a bad produt.

I loved how easy this humidifier was to fill (and it's silent when running) - but I made a very expensive mistake: I used tap water and kept it in the kitchen. Around the time I received this humidifier, I noticed that the flames on my gas stove were orange. It was an old stove, so I assumed there was something wrong with it - and I bought a new stove. When THOSE flames were also orange, I called my gas utility - they swapped out the meter (thank goodness that was free). Come to find out - the "ultrasonic cool mist humidifiers" send out vapor with everything that's in your water. Since I have a softener, the vapor included salt and lots of calcium/magnesium. Those compounds were causing my stove to burn orange flames; plus produced a stunning amount of white dust that went everywhere. Turning off the humidifier for an hour+ resulted in a normal-looking blue flame and no dust. I will keep this, and use it for bedroom, occasional use, filling it with distilled water. But I need a humidifier for my whole house, so have purchased a "steam/evaporative-type humidifier" that only sends out pure water vapor.

The humidifier is great, love all the smart features. I appreciate the large tank on the humidifier, but it still runs out daily. I run it 24/7 (on Auto), because it's winter, and my apartment gets SUPER dry with the heat on. It's very quiet, even on max, especially compared to my heater. I never use the sleep mode, but I'm sure it's useful for some people that are more sensitive to noise. I've lived in urban areas for a long time, so it could be 10x louder, and I still wouldn't notice it.

One issue I had was that I lowered the desired humidity level (on Auto), and it didn't seem to lower the output, so the humidity was higher than I wanted it to be. I had to switch to manual, adjust the output there, wait for the humidity to drop, then go back to Auto. Not sure if this was a one time glitch, or a problem with Auto mode. It only happened the one time, haven't really changed the humidity level since then.

Purchased the levoit 300S humidifier for a 300st/ft master bed and bath area. Works well and is has a relatively low noise level compared to the 600S with only a slight whistling noise. 300S is also easier to clean than the very difficult 600S. There are a few areas that are difficult to access and descale mainly the area around the secondary float.
There is a small water filter on the 300s in the top tank as well.
The 300S lacks a few features such as a storage clip on the unit for the included cleaning brush. I find that annoying on a high price unit. The humidifier also lacks a dedicated area for mineral absorption pad. I use the pads for the 600S since I buy them anyway. I've see no issue with performance. I've used the mineral pad tucked under the float (works best) and placed in the back of the unit (see pictures) you might be able cut them to fit where ever you want as well I've never tried it. The mineral absorption pads are worth the money. I have hard water so descaling the unit can be a chore, the mineral absorption pad helps with that as well as the annoying white dust. I normally use water from the fridge filter however I find my ZeroWater filter works best. Only need to do a minimal descaling job every 6 weeks now, with a quick weekly vinegar bath and brush.
The Max water line is at the upper handles I didn't see it on the clear plastic tank had to check the ownes manual. The app is just okay, it has adds that make it less than user friendly sometimes. The offending add sometimes blocks the main screen to access your device and controls, Forcing you to click the small X in the top corner of the add and then choose why you don't want to see this add. I'm sure They will most likely fix this in a future update. Typically I use the widget for quick on off and run schudules. I have other Levoit products so I am familiar with the app an use it daily.
The air purifier doesn't like the humidifier. When running side by side they purifier would detect the mist and run constantly. I now run them on opposite sides of 5ft dresser top and they do fine together. Overall it is a great unit and works well to humidifi my bedroom.
Cons
- Medium cleaning difficulty
- No clip for cleaning brush
- No designated location for mineral absorption pad.
- Adds in the app are sometimes intrusive.
Pros
- Large top fill water tank
- Water filter
- Full front button controls
- Front screen can be turned off for sleep (with the night light on or off)
- Cleaning reminders and tank empty notifications from the app.
- Ability to use both timers and scheduled on/off times.
- Night light with high low and off settings
My review is unpaid and I purchased the 300s at full price.

The product seems well made. It is easy to set up and operate also. The app is great too. Gives you more options actually. Also it uses WIFI and not bluetooth and that means you can change settings from any location you might be at. In other words if I was at work I can turn it on or off and use all the settings that it offers. The part that worried me is you can’t just leave water in it for a couple days sitting. I know that’s the sane with any humidifier because of bacteria or mold possibly developing. So unless your room is really low in humidity. (Under 30%), don’t fill it up your first time using it. It can hold about 1.5 gallons filled. Try a gallon or maybe slightly less. Experiment at first because the size of the room and other factors play a huge part on getting your desired results. Make sure you clean it even more often than once a week. Better safe than sorry.
You can also get an additional year of warranty coverage by registering your product using the app you can use to control it. Don’t forget to do that because you only have 16 days from purchase date.
Overall so far I like the product and the company gives plenty of info. Both in the box or on the internet. Make sure you purchase a hydrometer to keep in the room to measure your true humidity level in the room. I bought an Acurite for $16. Tells room temo and humidity level. So far everything is testing within 2% of the reading. I would buy this product again. But there are other good choices too. The app is what makes this device worth the price.

I have owned a few different humidifiers over the years, including the Levoit top-fill .5 humidifier (white round product). This is the BEST one I've owned so far. It holds enough water to use for at least 2 nights at "medium" humidity level and works well for small-mid size bedroom. It is as quiet as any I've encountered--NOT noiseless, but it has only a light hum from the motor and light rippling noises from the water bubbles. I have not noticed any loud gurgling noises from the water that you can experience with other humidifiers as the water moves through the system. You CAN use tap water and I've not seen any white residue. However, you will need to clean the product every few days (takes 3-5 minutes) with a soft hand towel and the small brush they provide to wipe away the rust/mildew stains to avoid long term staining. It's a reasonable trade-off to make for not buying a few gallons of distilled water each week. This is easier to clean than the small Levoit humidifier, but there are a couple spots that can be a bit hard to access.

I don't use the internet app--the manual functions are fine for my needs (turn/on and off and leave on at a set humidity level). One caveat: If you want to use the "night mode" function to dim the display (which is bright), it requires you to use "auto mode" rather than selecting a humidity level (you have to use the app to do that in night mode). I solve this by putting a picture frame an inch in front of the display at night--not ideal, but fine solution to eliminate the brightness to avoid using an unnecessary app.

Overall, i'm pleased with the product. It does the important things well: Good humidity, good water capacity, not annoyingly noisy and reasonable to clean if using tap water.

I consider this humidifier a good purchase; however, there are some caveats.
First the Pro's:

(1) It is almost silent, even at the highest output level. I have never owned a more silent ultrasonic humidifier, so this is a treat!

(2) It is easy enough to clean, with few "impossible" nooks and crannies.

(3) sleep mode (which turns the output on auto up to 50% humidity) works as expected at night.

(4) it is easy to operate with just the buttons - no need to use the app.

I don't use the app, aroma diffuser, or night light, so I can't comment on those features.

Now Cons:

(1) I had a powerhouse of a humidifier prior to this one - an Air O Swiss before the company was bought out by Boneco. I still miss that one greatly. It output mist like an illegally-opened fire hydrant in the summertime. Before buying this humidifier, I didn't do my research and mistakenly relied on the size of the tank to indicate whether I thought it would humidify my living room adequately. Both this one and my Air O Swiss are a similar capacity in the water tanks. However, the Levoit struggles in my livingroom to get the humidity past 40% when the radiator is blasting on a cold day (no ability to control the heat output where I live). My living room area is about 400 sqft. The description for this humidifier makes it seem like it should be able to handle a room this size. They clearly did not count on NYC apartment heating. If you are in the same situation as me where you can't control the heat output and they are blasting it, this humidifier is only good for the bedroom. For the living room, you really want something with a mist output that is double or triple the output of this one. I am considering the Levoit LV600S for this reason - mist output is 300ml/h for cold mist and 550ml/h for warm mist. For comparison, my current Levoit humidifier outputs mist at 135mL/hr. I should have paid attention to these numbers from the start. Learn from my mistake!

(2) Although this humidifier is much easier to clean than my old humidifier, it still does have a few "impossible" nooks and crannies that a small bottle brush and the tiny (included) brush can't reach. Those areas are permanently discolored with use. This is minor and something I am willing to live with.

(3) The hygrometer on the humidifier is often 7 to 10 degrees more generous than reality. I have found hygrometers on humidifiers to be inaccurate across all the different brands I've owned, so I just ignore the humidity number altogether. I have independent hygrometers in every room of my apartment. However, if you are relying ONLY on the hygrometer on this device to assure yourself that you are at the healthy 40% to 60% humidity range, do yourself a favor and get some independent hygrometers. Your nose will thank you.

This is a great humidifier. It pumps out the vapor, the app has not failed me once yet and is easy to to use. It does what it's supposed to and does it well. My rating stands even though I'm about to tell you why it's a pain in my ass.

My only issue with it is keeping it clean. I change the water and rinse it out every night, and I admit that I don't only put the recommended distilled water in it, only tap water. That is admittedly probably where my problem stems from, but I run this thing so much while it's dry as hell in Kentucky this time of year (winter) that I just don't want to have to stock gallons and gallons of distilled water, since it'll go through 2/3 of a tank in one night. I keep it set to auto shut off at 50% humidity, well within the recommended range and it still runs pretty much nonstop. That's not the fault of the app or software, it really is that dry in the winter here.

I keep to the app's suggestion of cleaning it once a week, and have even found myself having to do it more than that with the gross buildup of yellow slime all over the intake and all over the bottom section/reservoir and it's whole assembly. Maybe our water here is gross. Totally plausible, but man, the water in the bottom of this thing gets gross looking after a day of working. Bunch of mung floating in it that I have to rinse out daily.

I admit that this is probably user error, since I'm not running the recommended distilled water in it but it's just not economically feasible, since it'd take a gallon every other day. I know it's not expensive, but damn...I don't have space for 15 gallons of distilled water.

Point is, this thing works great, the app is great and works fine, love that it can be programmed to run at certain times of day and only under certain humidity levels and it absolutely pumps out the steam, much better than my last evaporative fan-based humidifier that was loud as hell. I guess I just want to say that if you want to run tap water in it, prepare to have to clean it ever other day, because the mung builds up quick and you don't want to be breathing that stuff.

Got this item today. Been trying out various humidifiers this winter with bad luck so far, and really hoping this slightly more expensive model does the trick. Here are my impressions so far in the first couple hours, and I’ll update this review as time passes if I have additional findings.

The unit is easy to set up and pair with Bluetooth. The warranty registration is straightforward.

It’s super quiet and easy to fill. The display is bright and easy to see, even from across the room. The app is user friendly and intuitive, and I was able to easily set to my target humidity level. I like that I can rotate the nozzle to direct the mist in the direction of my choosing. I like that night mode turns off the bright display. I like that it doesn’t beep at all.

It seems like it will be easy to clean, though not as easy as some round units I’ve tried. Those got sent back for beeping while sleeping, and not having effective enough output to raise humidity levels, respectively. I wish this one had a round tank like those did, but oh well.

I don’t think the humidistat is super accurate, according to my hygrometer, but that’s also somewhat to be expected. It’s a matter then of how far apart the readings are and how consistent they are.

The unit so far says it’s 5-10% more humid than what my hygrometer reads in the same room. Right now for example the base says 40% and the hygrometer about 6 feet away says 33%. This could cause issues because the instructions say that auto mode shuts off when the base reaches 50%. So that could be a problem if there’s a disparity of 10% or more with the base shutting off before the space actually reaches the 40% minimum that I’m aiming for.

That said, I’ll need to give it a few days of use before I can form a solid opinion. I also am in my living room right now, which I expect to have a different performance than my bedroom which is much smaller and closed off from the rest of the house. I expect humidity to collect more efficiently in the bedroom.

If I have to run the unit on manual during the day in the living room to get it in the 40s, that’s fine, as long as I can count on auto in my bedroom while I’m sleeping and maintain humidity in the 40s. I’ll update this review as I observe the unit’s performance in various circumstances.

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Been running this at night for several nights now, and overall am pleased. It's not consistent with my hygrometer, but it's consistent with itself. Meaning if I want it to go up to 45% in the room, I have to set the unit to 55%. It works well in nighttime mode and is quiet.