4 Best Filterless Humidifiers

Humidifiers are essential in any home. It is especially important for allergy sufferers or people who live in low humidity areas. The main problem with regular humidifiers is that you may need to change the filters from time to time. That is why people are switching to filterless humidifiers. With the filterless type, you don't have to change the filters which makes them cheaper in the long run. If you are looking for one, make sure that you opt for the best filterless humidifier.

Best Filterless Humidifier

In this product guide, we will compare the four best filterless humidifiers that you can find in the market right now. They are top-ranked and made with the best quality to give you value for money. Here is a quick guide.

This is a quiet humidifier that adds moisture to dry air. It consists of a 1 gallon tank capacity to make sure that your humidifier can last you long before adding in more water. It features a UV technology that will make sure up to 99.99% of germs in the water are killed.

The moisture that is added in the air is filtered as it has a wicking filter that filters the water and makes sure that it can evaporate in the air quickly. This also makes sure that you do not over-humidify the air.

The standard humidity in the air should be between 40-60% so that it is healthy for you. Enough humidity is not only important for humans, but also for furniture and electricity in your home.

The humidifier has a recessed tank handle, and that makes it easy to carry. It is also easy to fill with water and easy to clean.


  • Product dimensions: 17.9 x 9.37 x 11.4 inches
  • Product weight: 8.36 pounds
  • PROS

    • It has a large capacity tank of up to 1 gallon
    • It has a UV filter technology that kills that germs in the water before the moisture is added into the air
    • It has a wicking filter technology to make sure there is no over-humidification
    • It is easy to carry around, refill and clean


    • Some users complained of mold under the fan blades after some time

    This is a mini portable filterless humidifier. It can be used as a humidifier, but also works as a diffuser where you add your essential oil to the water. With the diffuser function, it does not release a lot of moisture into your space; hence if you want more moisture, you will have to use it without the essential oils.

    Since it is small, it has a low tank capacity of 300ml. It may, therefore, not be ideal for use in the whole house. It has an auto-off function that makes it turn off automatically after five seconds when your water runs out. That is important for your safety and protection.

    There are different time settings, which are one hour, three hours, six hours, and continuous. As for the mist options, there are two: strong or standard. You can choose settings that you are most comfortable with.

    The humidifier has seven soothing LED lights with seven different colors. Each color can either be dimmed or brightened. You can cycle it to different colors to suit your needs. It uses ultrasonic technology to make sure that it does not interfere with your norm.

    It can make a perfect gift as it has a beautiful finish that can also be a décor piece. It is backed up by a 45-day money-back guarantee and 1-year warranty.


    • Product dimensions: 165 x 68 x 66 mm
    • Product weight: 160g
    • Power mode: USB


    • It is small and portable
    • It can be customized into different settings and modes
    • It has an auto-off function
    • It has a soothing LED light that makes it suitable even for the night
    • It comes with a 45 days money-back guarantee and 1-year warranty


    • It is tiny hence is best used as a diffuser as opposed to a humidifier
    • It is best for small spaces and thus may not work for you if you have a big space

    This is not only a filterless humidifier but is also smart and can use Wi-Fi. It is compatible with google home, Alexa, HomePod, IFTTT, Siri, etc. It has a large capacity of 3.5 liters that makes it suitable for use in the whole house. Its large capacity can last you up to 48 hours. It has a rotating nozzle that can rotate up to 360 degrees so that there is even distribution of humidity in your room.

    All you need is a SwitchBot app and you can set your humidifier to your preferred settings. You can choose the humidification efficiency, generally in the form of a percentage that ranges from 0-100%. The SwitchBot app can be used as a remote control for your humidifier.

    Since the SwitchBot humidifier is smart, it can automatically detect when the air is dry, alerting you when to turn on the humidifier. There is an auto mode that can help you maintain the humidity in your home. 

    It is a quiet machine as it has a sound level that is lower than 36dB. That makes it suitable for use in the bedroom at night.

    Even though it is compatible with Wi-Fi, it works best with Wi-Fi with speeds of 2.4GHZ or more.

    It has a top fill design to give you convenience when it comes to filling water. It has a ceramic filter to make sure that you get a clean and healthy mist. The machine is also energy saving so that you do not use much energy. When you buy it, you get a 1-year warranty and lifetime support.


    • Product dimensions: 7" x 7" x 11.6"
    • Product weight: 3.92 pounds


    • It is quiet with a sound lower than 36dB
    • It has an auto shut mode
    • It has an Auto mode
    • It has a good top-fill design
    • It is energy saving
    • It is smart
    • It has a large capacity of 3.5L
    • It has 4 mist modes


    • Some users complained that the oil diffuser did not work well
    • Some users complained of leaks
    • Some users complained that the motor got noisy after some time

    The Onson Humidifier is an excellent filterless humidifier that many prefer to use in the bedroom. It is a whisper-quiet humidifier with a humidistat LED display that makes it suitable for the bedroom. The sound levels are 30dB, which is decent.

    It has a large capacity of 4.5L that can last you longer than many regular humidifiers. It can support 15 – 50 hours though, depending on the mist setting. The more powerful the setting, the more moisture it will emit. It has a top fill design that gives you convenience when it comes to filling in the water.

    The mist output is adjustable with three mist levels, and you can adjust to whatever you prefer. The mist level is either low, medium, or high.

    There is a built-in humidistat that can help keep track of your humidity levels.

    There is a sleep timing mode, auto shut-off mode. It has a timer that can help you avoid over humidification and power wastage. You will also get an alert when the water level is low.

    It has a stainless-steel filter to block out any impurities.

    It is easy to clean and easy to carry around.

    Even though it is a great humidifier, it is not meant to be used with essential oils as a diffuser.


    • Product dimensions: 13.6 x 8 x 8 inches
    • Product weight: 3.34 pounds


    • It has three customizable mist levels
    • It has a large capacity of 4.5L
    • It is quiet
    • It has a sleep timing mode and auto shut-off mode
    • It has a stainless-steel filter


    • It cannot be used as a diffuser
    • Some users complained of leaks
    • Some users complained that the display does not work

    Buyer’s Guide

    All the above are great picks. In this section, we strive to help you make an easier decision by focusing on the specifics. Here they are.

    Most hi-tech humidifier: If you are inclined to technology, then we recommend the SwitchBot Wi-Fi Smart Ultrasonic Humidifier. It can be used with the SmartBot app and is compatible with many other applications such as Siri and Alexa.

    Best humidifier for a diffuser: If you are primarily planning to use the humidifier as a diffuser, then we recommend the Mini Air Cool Mist Humidifier. It has a small capacity and auto shut feature to make sure that you get the right amount of your oils.

    Humidifier with the biggest capacity: If capacity is a matter of concern to you, then we recommend the ONSON Cool Mist Humidifiers since it has a capacity of 4.5L, which is the largest comparatively.

    The best humidifier will depend on your needs. It is, therefore, essential to define your needs first. All of the above are our best recommendations.

    Leave a Comment

    Your email address will not be published. Required fields are marked *