LEVOIT Classic300 Ultrasonic Top Fill Humidifier, Extra Large 6L Tank Last 60-Hour - Super Quiet, Easy to Use and Clean, 360° Rotation Nozzle, Simple Knob Control, Handle, Auto Shut Off, Gray

I purchased mine 27 mos. ago and it worked superbly until now.As I reviewed the user manual I discovered that I had not followed all the use and care instructions-particularly regarding unplugging it when not in use.I emptied all the water and thoroughly cleaned it and set it up, filled it with fresh water and plugged it in.Still no response. Perhaps the humidity sensor is no longer working. The panel light said the humidity was 70% or greater (don't remember for sure how high, but well over 70% and it is not designed to work when it's greater than 50% humidity) and the room's humidifier scale said bedroom's humidity was only at 33%. I will definitely reread the user manual for the other model to lessen the chances of it failing as well.I would gladly replace it (live in Idaho where the outside humidity is notoriously low and will cause my sinuses to bleed) as I have the Levoit OasisMist600S Smart Humidifier Model to fall back on (living room). I used the Classic 300S in the bedroom.I may replace it this coming winter so I again have one in both areas of my home. Both have been a godsend.

Very efficient humidifier. We have a very large bedroom. I didn't think I would like the phone app much but was surprised how convenient it is to have. I like the auto-shut off when the humidity gets 5% over target level. I filled the unit 4 days ago when it was pretty dry outside (I live in New Mexico, we do DRY very well). Some weather moved in and I still have 2/3 tank full since the humidity rose. My old humifier had to be filled twice a day regardless of weather. This model is much smarter and incredibly more efficient. I think it nebulizes the water to a finer mist so we get more humidity per liter. The night light is a nice touch (and you can turn it off with your phone, convenient when you're in bed and quite a distance from the unit)

It works much better than our old fan evaporative humidifier. However, the fine mist humidity does turn our stove flame orange--salts in the water or incomplete combustion with possible CO. we use the stove vent on now when we cook and it helps and we haven't died --yet.

I’ve had this device for a couple weeks and have a few issues I’d like to point out:The ‘low’ setting produces a relatively loud high-pitched sound that I’m very sensitive to, so I cannot sleep with it on low. Fortunately, I use the auto setting, which rarely drops to low before turning off. The noise seems to come from the ultrasonic diaphragm, not the fan or other components, indicating the device is likely operating as intended. I've seen similar behavior in other ultrasonic humidifiers after trying several models. Ironically, medium/high settings are quieter than low and just produce more mist without that dreadful high-pitch sound.The app should not be necessary for all features. Out of the box, the available settings are low, medium, high, and auto. Auto defaults to 50% relative humidity, which is unreasonable, as no online resource I could find recommends an indoor relative humidity that high. For use in winter the commonly recommended range is 30-40%, and anything higher could encourage mold growth or excessive condensation. The app is needed to adjust the target humidity, which I strongly recommend you do, otherwise, you risk wasting power, water, and creating adverse effects from excess humidity. The device really should have an additional button to adjust target humidity, or repurpose an existing like holding the power level button or something which could be added in firmware.Auto mode also needs improvement. It runs the humidifier full blast until it exceeds your target by 5% and stops, not restarting until humidity falls 5% below the target. When I set my target to reasonable 35%, the room stayed very dry at under 30%, and the humidifier barely ran leaving the room quite uncomfortable. I adjusted to 45%, so it starts at 40% and runs to 50%, which I’ve found is a nice balance where the room mostly hangs closer to 40%. However, auto mode mostly runs on high, producing an excessive amount of vapor. I had to push the humidifier to the edge of my dresser to avoid moisture on the wall. I can only imagine using this on a shorter nightstand next to your bed risks soaking your floor or bed with how much mist this thing can kick out.Additionally, firmware updates are applied when connected to the app, indicating potential fixes for some issues I’ve encountered could be made. The 10% range in auto mode is far too large. I believe a 5% range would be much more ideal. I’d like to be able to set to 40%, it would then run until 42.5% and start again after falling to 37.5%, maintaining a more comfortable and controlled humidity level. Limiting mist power in auto would also help. My previous Winix humidifier allowed you to set the humidity target and limit power level. I would prefer limiting mist to medium to avoid any issues with excessive moisture when on the high setting.I also found a bug. The device allows turning off the display while activating the nightlight, but in the app, if you turn off the display, it reactivates when you turn on the nightlight. This requires manual adjustments on the device itself before bed, which is inconvenient and can be fixed in the app.Despite these issues, I still consider this a very good product. It's visually appealing, unlike most humidifiers which look like an unsightly medical device, and it works well. It puts water in the air, runs quietly (except on low if you're sensitive to high pitch sounds), and its 'smart' features work relatively well.

Working great; we had a problem with the system leaking in our first one, and the company replaced it quickly. The new one is working without leaks; nice to be able to control the device through the phone, too.