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Model #U300

1.3 Gal. Top-Fill Cool Mist Ultrasonic Humidifier

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  • Includes water filter that sifts out copper, lead and mercury
  • Features user-friendly, top-fill design
  • Add your favorite scent with the fragrance tray
  • View More Details
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Product Overview

Experience the ease and user-friendliness of the U300 Ultrasonic Humidifier. Winner of the prestigious Red Dot Design Award, the top fill feature offers a cleaner, more convenient method of maintaining your unit. The control dial lets you configure the desired output level and immediately experience how refreshing humidified air feels. In addition, you can add essential oils to the fragrance tray to create a personalized and soothing atmosphere. Using the tank window and the low water level indicator, you can immediately tell when the water needs to be refilled. This unit can be cleaned easily and integrated accessories help keep the water fresh. The Ultrasonic Humidifier includes the A250 Aqua Pro 2-in-1 Water Filter. This filter not only significantly reduces water hardness, but also acts as a water purifier to filter out harmful substances such as copper, lead, mercury as well as unpleasant odors from your water. The A250 Aqua Pro will last up to 6 months and there is a water test strip included with the filter so each user has a better understanding of how long the filter will last based on their local water hardness. The longer life-cycle of the A250 Aqua Pro helps keep the maintenance costs down while ensuring the best quality of water is being used in your humidifier.
  • High output for fast humidification - up to 2.5 Gal./day
  • Practical top fill design
  • Easy operation with rotary knob
  • Fragrance tray for the use of essential oils
  • Easy handling and cleaning due to easy access inside of the tank and humidification chamber
  • Water empty indicator (red LED)
  • Automatic shutdown at low water level
  • Cool mist humidification
  • Red dot design award winner
  • 2-in-1 Aqua Pro and EZCal descaled included
  • Click here for more information on Electronic Recycling Programs

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NameCool Mist Ultrasonic Humidifier1.3 Gal. Top-Fill Cool Mist Ultrasonic Humidifier4l Ultra-Sonic Cool Mist HumidifierW200 Air Washer
Humidifier FeaturesAutomatic Shut Off,Filter Included,Oil Diffuser,Tank Empty Indicator,Variable Speed,Water Level IndicatorAutomatic Shut Off,Tank Empty Indicator,Variable SpeedAutomatic Shut Off,Tank Empty Indicator,Variable SpeedAir Purifier Included,Automatic Shut Off,Oil Diffuser,Tank Empty Indicator
Room Size (sq. ft.)Medium (400-1000 sq. ft.)Medium (400-1000 sq. ft.)Small (Less than 400 sq. ft.)Medium (400-1000 sq. ft.)
Humidifier Tank Capacity (Gallons)
Included ItemsNo additional items includedNo additional items includedNo additional items includedNo additional items included
Maximum coverage area (sq. ft.)430540350540
Run time (hours/tank)24131215
Voltage (volts)120120120120
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Maximum coverage area (sq. ft.)
Product Depth (in.)
Product Height (in.)
Product Width (in.)


Air Treatment Product Type
Tabletop Humidifier
CARB Compliance Warning
Does not meet California requirements; cannot be shipped to California
Color Family
Control Type
Humidifier Features
Automatic Shut Off,Tank Empty Indicator,Variable Speed
Humidifier Tank Capacity (Gallons)
Included Items
No additional items included
Moisture dispersion type
Cool mist
Number of Air Filters Included
Number of Fan Speeds
Product Weight (lb.)
Room Size (sq. ft.)
Medium (400-1000 sq. ft.)
Run time (hours/tank)
Voltage (volts)
Water Filter Replacement Model#

Warranty / Certifications

Certifications and Listings
ETL Listed
Manufacturer Warranty
3 Years Limited Warranty

Questions & Answers

Typical questions asked about products:

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Customer Reviews

  • 4.5
    out of 24 reviews
  • 95%recommend this product
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Showing 1-10 of 24 reviews
Hard to clean, noisy
I own two of these as replacements for models which have a separate water tank. Mistake from the beginning. When trying to wash out the tank after it gets dirty, it is impossible to rinse out without getting water all over the counter, floor and myself. If you use the cleaning solution, you want to rinse that out before running the humidifier. Unfortunately, the design is done in a way where when you tip the unit to pour water out, it seeps our the bottom and onto the floor. I don’t think the people that made this design ever had to actually clean this humidifier. Otherwise, they would have done it with a separate water tank. Save your money and buy another brand with a separate water tank. While they claim it’s convenient, when you need to cleaning after a week or so, you will understand my issue.
Response from BONECO Product ManagerAug 5, 2020
Hello. I'm sorry for the experience that you encountered with the unit when draining it after rinsing. To avoid water getting into the basin, you need to pour the water away from the hole where the air blows the mist out. You can avoid this by pouring the water out toward the front (side with the window) as the user guide shows. That will avoid water getting into the base.


    Great Humidifier!
    I love my U300 Ultrasonic Humidifier! It’s the perfect size, and holds a good amount of water. I can’t believe the amount of mist that it produces, and it doesn’t leave anything wet or damp. I can choose the direction that I want the mist to go in by moving the dial on top, and change the output level from the dial on the front. The clear blue window in the front of the humidifier makes it easy to see how much water is in the tank, and when it’s almost ready for re-filling. You just add water right in the top, and there’s also a handy container in the back to add essential oils if preferred. It’s really easy to clean, and it also has a great filter in it. The motor is extremely quiet, I don’t even hear it running. I’m extremely satisfied with the quality of it, and it’s stylish looking!
      • Recommended
      Keeps our room air quality fresh
      [This review was collected as part of a promotion.] We have been using our Boneco U-300 for about a week now. We use it in our bedroom and close the door, and only use it at night. Right out of the box, this humidifier is very easy to set up. It is lightweight when empty but also when full I could carry it. It comes with a filter that is easy to install in the main water compartment. Also in the main water compartment is a little brush for cleaning attached to the top. It comes with a test strip to test your water to see how often you need to change the filter. And last it arrived with a packet of EZ CAL cleaning solution. I tested my water and the strip was all green, so according to the chart I need to change the filter in about 6 months, having soft water. I then installed the filter, and filled it up. Plugged it in, and turned it on with the large dial on the front. This dial also lights up blue and its almost like a nightlight. You can adjust the amount of cool mist with the dial. Also on the top is a dial you can adjust which was the mist goes. It runs pretty quiet, and we have a fan on also, so we couldn't hear it. One fill up lasts us about two nights. It is really easy to refill. We haven't run it our of water, but if it does, it will automatically shut off. We can already feel the benefits of sleeping with the U-300 on. We don't wake up stuffy with a runny nose and coughing. The quality of our sleep seems to be better. We use it every night.
        • Recommended
        The humidifier is super quiet. We have it in our living room where we watch TV and you barely not...
        The humidifier is super quiet. We have it in our living room where we watch TV and you barely notice it is running. The upstairs is about 800 square feet and the unit seems to do an adequate job of keeping the humidity levels comfortable during the cold MN winter. Our water is not softened so we will have to replace the filter every few months. There is no residue on the hardwood surfaces that some other machines produce. Overall we love how quiet it is and the 1+ gallon capacity makes it functional without too much hassle.
        • Recommended
        1 person found this helpful
        This is a really neat unit. It one of the nicest humidifier ive used. It comes well packaged with...
        This is a really neat unit. It one of the nicest humidifier ive used. It comes well packaged with a nice set of instructions. Its pretty self explanatory but still nice to read up on the cleaning and water testing procedures. This is one of the few humidifiers that has a builtin in filter and the only one ive ever used that has an ultra sonic action. I couldn't tell you how if the ultrasonic is a must have or not but the mist that comes out is super clean and really nice to breath. it could be due to the filter or both but whatever it is it does a great job. On the back it has a spot for aromatic oils...use it. It just makes using it that much more soothing. The volume of mist on full is a lot but still last over night and then some.
        • Recommended
        2 people found this helpful
        My last dehumidifier used a heating coil to create steam. It was great for not creating 'white d...
        My last dehumidifier used a heating coil to create steam. It was great for not creating 'white dust', but expensive to run. This uses Ultrasound, which is cheap to run (30 Watts), and this keeps the white dust to a minimum by using a filter (see pic). One filter is included, with a test strip (see pic); sure I will notice white dust before I remember to test. The filters last up to six months, and are $20, or $.11 per day (which is still cheaper than my old heating coil). The instructions are pics (see pic). My filter did not have a blue cap. So, I skipped step 1 & 3 (not sure what 3 wanted me to do, even if I had a blue cap?). I love that it is top loaded. I no longer have to deal with spilling water as I remove and install the water tank. I only wish the tank was larger. It is not heating season yet, but based on the Specs, I might be filling it twice a day. If you want a super quiet humidifier that looks cool, and can fit on a desk (requires to be greater than 3' from floor), than this is perfect. P.S. I find it funny the safety instructions warn, do not operate under the influence of alcohol.
        • Recommended
        1 person found this helpful
        Extremely quiet and efficient
        [This review was collected as part of a promotion.] It has been so hot and extremely dry this summer that I had to do something! The dry air was making my CPAP cause nosebleeds! This humidifier is so very quiet that I can use it in the bedroom without creating disturbance and has solved the problems of nosebleeds, dry skin (even my dogs have benefited) dry eyes and static. The reservoir holds enough to last several night too! It's so easy to operate and so efficient to use that I can't believe I had not thought of trying this little gem before.
          • Recommended
          Wide coverage.
          [This review was collected as part of a promotion.] I have never had such a small humidifier that has provided such wide coverage of a room. You don't have to sit right next to the Boneco U300 to get the benefits from it, it covers a wide area with a gentle moistness that I prefer. Everyone in my home with allergies has felt so much better from the added moisture. I absolutely love that it has a 2 in 1 water filter so no residue and you can also use fragrances and essential oils with it. I did this and the house smelled so good! It's very easy to fill and control and I love the size. It's not really big or too small either so it's easy to find a place for it.
            • Recommended
            [This review was collected as part of a promotion.] I absolutely love this humidifier. It's so easy to use and works wonderfully. I especially enjoy the feature of putting essential oils in with the water. Then I don't have to use my diffuser, just this humidifier. The climate control is pretty amazing, too. It's a nice looking product , too so I don't mind having it displayed.
              • Recommended
              Great Humidifier
              [This review was collected as part of a promotion.] I am very happy with this humidifier. Finally, and easy to fill humidifier. Simply open the top to fill easily, and close. Easy operation. Works quietly, to disperse a great mist that keeps my room from getting too dry. I love that it can put out up to 2.5 gallons a day if needed, and love that you can control the amount of humidity you put out. Can use essential oils in this as well, which is a huge plus for me. Very quiet to operate, and simple to clean. I would recommend.
                • Recommended
                Showing 1-10 of 24 reviews