Best Filterless Humidifiers | Comprehensive 2020 Buyer’s Guide

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If you live in a zone where the winters are incredibly cold and dry, then investing in a humidifier can be the smartest move you can do for your indoor air quality and health. Humidifiers are used in adding moisture to your environment as they improve the humidity of the office, room, and home.

They are a great tool since they help to fight against the building of statics in the house and to eliminate the onset of airborne viruses, weather ailments, and the common cold. They even help in keeping your skin from peeling and protect it from drying out.

However, replacing the filter on these humidifiers can be a difficult task to do and can even become costly over time. For this reason, opting for a filterless humidifier can be the perfect option for you.

Comparison of the Best Filterless Humidifiers 

PRODUCTDETAILS
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UCareAir Cool Mist Humidifier

  • Best Overall Filterless Humidifier
  • It Comes With a Built-In Night Light
  • This Unit Has Two Different Mist Levels
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Pure Enrichment MistAire XL Humidifier

  • Runner-Up on the List
  • It is User-Friendly and Easy to Operate
  • This Unit has a Detachable Power Cord Which Makes it Easy to Remove for Cleaning
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Rosewill RHHD-14002

  • Can Hold Around Five Liters of Water
  • Best Filterless Humidifier for the Money
  • Efficiently Humidifies a Room Measuring 250 Square Feet
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OPOLAR Filter-Free Digital Humidifier

  • Best Cool Mist Option
  • Comes With a Timer Making it Incredibly Easy to Use
  • With Three Different Mist Levels, You Can Adjust This Unit According to Your Need
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Anypro Cool Mist Humidifier

  • Best Ultrasonic Filterless Option
  • You Also Get a Large Tank Allowing This Product to Work Through the Night
  • It Comes With an Adjustable Mist Level and Rotating Nozzle, Allowing You to Direct This Unit
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Venta LW45 Airwasher 2-in-1

  • Best Three-Gallon Water tank Filterless Humidifier
  • Incredibly User-Friendly Due to its Simple Technology
  • It Can Easily Humidify a Space of Up to 400 Square Feet Easily
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Ultrasonic Cool Mist Humidifier

  • Largest Filterless Humidifier
  • It Comes With Exceptional Features Such as Auto Shut-Off
  • This Unit Makes No Noise and Provides You With a Good Night’s Sleep
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LEVOIT Humidifiers for Large Room

  • Best Filterless Humidifier for the Whole House
  • It is Made With Premium Quality Material, Allowing it to Work Perfectly in the Long Run
  • It Comes With Smart Controls, a Remote and Even a Smart Mode, Making it User-Friendly
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What is a Filterless Humidifier and How Does it Work?

Due to the advancements made in technology, humidifiers have become an essential part of a household today. However, many people do not prefer filtered humidifiers since they can get dirty and be unhealthy for them and their kids. For this reason, filterless humidifiers were introduced in the market. These filterless humidifiers have many advantages, which explain why these are so popular now.

A filterless humidifier has the ability to moisturize the air and keep it clean at the same time. Since they make use of advanced cleaning technology, they do not make noise and work on their own. These humidifiers work by using water and creating mist in the air. These units make use of changes in sound that allow you to alter the frequency and moisture being expelled in the room.

Aspects to Consider Before Buying

Even with plenty of well-known and famous humidifiers present in the market, there are certain features you must look out for. These features help in ensuring that you invest in the best product available and make it useful for you. To ensure you buy the best product, take the following features into consideration before investing your money.

Water Tank Capacity

This is a very vital factor to consider when shopping for filterless humidifiers. How effective the unit will be in moisturizing your house depends entirely on the unit’s water tank capacity. Moreover, you must also know the size of the room where you will be placing the unit; this will help in making the right decision.

It is recommended that you invest in a unit that comes with a large water tank as it has the ability to work for longer periods of time. This way, the air can get dispersed in your room easily and moisturize it without leaving your room dry.

Humidistat

This is another vital part of a humidifier. This feature helps in maintaining the moisture level and does not allow it to cross a particular point. It's important that you opt for a filterless humidifier that comes with a humidistat. Units without this feature are capable of producing extreme amounts of moisture that can harm your health and items within your home.

Sound Level

Every humidifier tends to make some noise regardless of its type and model. If you are using a humidifier for your bedroom, then you must opt for a unit that does not disturb your sleep and is as quiet as it can be.

In general, the larger the filterless humidifiers are, the noisier they tend to be. However, some brands make large filterless humidifiers that are not noisy at all, so it may be better to invest in them instead.

Quick Take: Best Filterless Humidifiers

These are our recommendations for the best filterless humidifiers:

  1. UCareAir Cool Mist Humidifier
  2. Pure Enrichment MistAire XL Humidifier
  3. Rosewill RHHD-14002

Review of the Best Filterless Humidifiers

Finding a humidifier on your own requires a lot of research and deep digging into features, quality, and pros and cons. To make this task easier, we've compiled the top filterless humidifiers present in the market. We have classified them according to their price point, coverage, noise level, and even the capacity of their water tank.

Cool Mist Humidifier – Humidifier for Bedroom, Quiet Mist Humidifier, High Low Mist, Waterless Auto-off, Night Light, Baby Kids Nursery, 2L Tank, Filterless Humidifiers for home office, ETL Approved

PROS

  • It is a Quiet Working Humidifier
  • It Can Run Up to 10 Hours Easily
  • This is Easy to Use and Refill Unit

CONS

  • It May Leak if the Lid on This Unit is Not Closed Properly

Our Review

The UCareAir humidifier is one of the best filterless humidifiers present in the market. It makes use of whisper-quiet operation through its ultrasonic technology. This allows the humidifier to work easily with a 32 dB noise level and does not disrupt your sleep, study, or work time. Also, for this reason, this is an ideal humidifier for your office space.

Even though it has a two-liter water tank, this provides you with mist all night long. It has the ability to work all through the night in low-level mist and covers around 200 sq. ft. of bedrooms, offices, and other medium-sized areas. Besides the length of time it can function, this unit also provides you with a soothing dim light that relaxes you.

The unit’s ability to automatically shut off provides it with a good level of security and safety. The cool mist humidifier will turn itself off when the water level is low or when the tank is removed. It will show a red LED light in order to warn you beforehand. This feature makes it a worry-free product. You also get the chance to pick between two different mist settings – high and low. This allows you to adjust the level of mist according to your requirements and comfort level.

Bottom Line


This is a good humidifier that comes with exceptional features and user-friendly controls. This filterless humidifier works easily in medium-sized bedrooms and has no noise, hence providing you with a good night’s sleep. Apart from its water leaking drawback, this product is easy and cheap to maintain.

Pure Enrichment MistAire XL Ultrasonic Cool Mist Humidifier for Large Rooms - 1 Gallon Water Tank with Variable Mist Control, Automatic Shut-Off and Optional Night Light - Lasts Up to 24 Hours

PROS

  • It is Easy to Clean and Refill
  • This Unit Has Two Different Speeds That You Can Adjust Accordingly
  • The 360-Degree Mist Nozzle Allows You to Humidify All Corners of Your House

CONS

  • Even Though it is an Easy to Clean Product, You Will Have to Clean it Regularly in Order to Remove Any Kind of Build-Up

Our Review

This MistAire XL Humidifier is a filterless unit that helps in improving the moisture level of your household. This product works quickly and makes no noise at all hence, creating a peaceful environment. Also, this humidifier has a reasonable price with plenty of good features.

It also has whisper-quiet functionality. Unlike other filterless humidifiers that make noise when working, this product is quiet as a mouse and does not disrupt your sleep at all. Moreover, it shuts off automatically when the water tank level gets low. When you remove the tank on this unit, it turns itself off to ensure worry-free filling and operation.

The nightlight present on this unit is subtle and perfect for kids and adults that like some light in the room as they sleep. This unit is small, yet extremely powerful in its functions. It is of a small size making it perfect for all kinds of rooms, and at the same time, it improves the air quality as well. This unit is ideal for medium to small-sized rooms, hence perfect for your bedroom.

Moreover, the mist nozzle on this product is rotatable. This allows you to humidify any corner of the room you want regardless of where your unit is placed. Also, due to its dual speed control, you can alter the performance of this humidifier. You can set this product to the power you want depending on your preferences and how long it should operate.

Bottom Line


This humidifier is a great product that is reasonable and has some ideal features. It includes different speed levels, a detachable power cord, and adds quick and efficient moisture to the air. This makes it a great humidifier for your household.

Best For The Money:
Rosewill RHHD-14002

Rosewill Ultrasonic Cool Mist Humidifier for Bedroom Filter Free with No Noise Adjustable Dual Nozzle Mist Outlet 5 Liter / 1.3 Gallon, Black, RHHD-14002

PROS

  • Makes No Noise at All
  • Incredibly Easy to Use
  • It is a Reasonable Humidifier
  • It Has a Stylish Design That Allows You to Place it Anywhere You Want

CONS

  • It Requires Regular Cleaning
  • The LED Light on This Unit is Too Bright and Cannot Be Turned Off

Our Review

Our humidifier reviews would be incomplete without mentioning the Rosewill RHHD-14002. This product is ideal for people who suffer from different breathing problems such as sinus congestion.

It comes with a five-liter tank and is capable of holding enough water for operation through the night. Moreover, this unit also comes with an adjustable nozzle. This nozzle can rotate 360 degrees and allow you to moisturize any corner of the room.

With this nozzle, you can place the unit anywhere you want and control the direction, as well as the dispersal, of the mist. No matter which angle the unit faces, with this rotating nozzle, you can enjoy mist wherever you want. Furthermore, this humidifier has an auto shut-off function. This allows the unit to be turned off right away as soon as the water tank is empty. This protects the humidifier from overheating and secures the sensitive components of this product.

The unit also has additional features that include adjustable settings for the mist and even a soft LED glow in the night light. The adjustable mist allows you to control the dispersing of the moisture of this product and choose the amount you see fit.

Furthermore, this product also features ultrasonic technology that allows you to have a quiet and peaceful sleep. Moreover, you also get an LED light that allows this unit to act as a lamp at night.

Bottom Line


This unit is, no doubt, excellent. It has great features, works perfectly fine, and it even keeps your room moisturized. However, nothing is ever flawless, and this unit has some drawbacks as well. But the pros of this humidifier definitely outweigh the cons, in our opinion.

Best Cool Mist Filterless Humidifier:
OPOLAR Filter-Free Digital Humidifier

OPOLAR Quietest Filter-Free Digital Humidifier for Baby and Bedroom,Preset Humidity, 3L/0.8 Gallon, Ultrasonic Cool Mist House Humidifier with Timer, 3 Humidification Speed, Sleep Mode

PROS

  • It is a Quiet Product Ideal for Your Bedrooms
  • It Has a Filter-Free Design That Makes it Easy to Use
  • Its Sleek and Compact Design Along With the Black Color Makes This a Great Humidifier

CONS

  • This is Not a Very Durable Unit and Can Break Easily

Our Review

This humidifier is the best product that you can invest in for a good night’s sleep. It provides you with a cool mist that allows you to sleep well at night. The ultrasonic technology used in its production ensures that this humidifier is extremely quiet. This unit makes less than 35 dB of noise and has a sleep mode as well. When switched to this mode, this unit goes completely dark and turns off all lights that can otherwise disturb your sleep.

Moreover, it comes with a touch-sensitive LED display that is digital and allows you to use plenty of functions. With this display, you can preset the humidity level to what you prefer. You can adjust the level between 45HR-85HR and even control the humidity in your room, hence reducing the chances of germs and illnesses.

Also, this unit comes with a built-in timer that allows you to turn this unit on and then sleep without worrying about turning it off. The timer allows you to set it between one and nine hours. It has the ability to work for twelve to twenty-six hours continuously with low levels of mist. Furthermore, you get to choose between three different mist levels. These levels include low, high, and medium level and you can choose the one that best fits your room.

This humidifier has a large water tank and twin nozzles that make uniform vaporization but produce mists independently. Plus, its auto shut-off sensor allows this unit to remain protected when the water levels are too low; thus keeping the unit safe.

Bottom Line

This product is no exception. It is a cool mist product and has amazing features and an LED digital display. This unit is user-friendly and is worthy of your money. Also, due to its one-year warranty against defects, you can enjoy this unit without any worry.

Best Ultrasonic Filterless Humidifier:
Anypro Cool Mist Humidifier

Anypro Cool Mist Humidifiers, 2 Liter Ultrasonic Humidifier w/Quiet, Timing, Waterless Auto-off and Night Light Function, Mist Humidifier with High Low Mist, for Babies/Bedroom/Home/Office

PROS

  • It is a User-Friendly Unit
  • Provides Good Coverage
  • Comes With an LED Light
  • It has a Classy and Elegant Design, Making it Look Good in Medium-Sized Rooms

CONS

  • It Requires Regular Maintenance and Cleaning Before Use

Our Review

This cool mist Anypro humidifier is a unit that keeps you hydrated through every season. It allows you to get rid of the dry skin and sinus issues and say goodbye to nosebleeds from dry air. Anyone looking to upgrade their indoor air quality without any noise should definitely opt for this unit.

Its large tank capacity helps in humidifying the air for ten to sixteen hours straight on a continuous operation before you run out of water. It also provides you with long-lasting air filled with moisture. Furthermore, due to the rotating nozzle on this unit, you can place it anywhere in the room and direct the mist according to your requirements.

This feature also makes the unit perfect for offices, nurseries, and bedrooms. Its adjustable mist levels allow you to meet your demands. This product comes with two different mist levels; high and low, allowing you to choose according to your comfort level and the room’s humidity.

Moreover, you can also choose the timer setting and set this product to work for one, three, or six hours straight before it turns off automatically. This makes it a suitable and worry-free product.

Its ultrasonic technology makes this unit noiseless and the switchable dim LED light allows you to make this item act as a lamp as well. This product is versatile and allows you to set it according to your needs.

Bottom Line


This is an excellent product compared to the units present in the market. It helps in moisturizing your room according to your needs and requirements. Its advantages definitely outweigh the drawback of maintaining it.

Best 3-Gallon Model:
Venta LW45 Airwasher 2-in-1

Venta LW45 Airwasher 2-in-1 Humidifier and Air Purifier in White

PROS

  • It Humidifies and Purifies Your Room Easily
  • The Manual Controls on This Unit Make it Easy to Use
  • Its Automatic Shut-Off Feature Makes This Worry-Free

CONS

  • It is Not a Quiet Humidifier
  • The Nightlight on This Unit Does Not Turn Off

Our Review

The Venta LW25 is a humidifier that has the ability to dry up the air and at the same time, purify the water by removing allergens, dust, pollen, and pet dander. This unit can moisturize a room with an area of up to 400 square feet. Since it does not make use of a filter, this humidifier is incredibly easy to clean and maintain. Also, this unit uses cold water evaporation technology that does not let this unit create any of the white dust that other humidifiers do.

Setting up this product is exceptionally easy and is shown clearly on the box. You do not have to assemble any small pieces or buy distilled water. Filling this unit is another simple process and can be done easily and quickly. Since it does not require any special water, refilling this product does not cost you anything.

Apart from its manual control, this unit also comes with an auto shut-off feature. This feature turns the humidifier off when the water tank is absent and even when the water level is low. However, this is not a quiet humidifier and produces a slight noise that is equal to the noise of a moving fan. Even on its highest settings, this humidifier is not too loud.

The blue lights on the unit act as a lamp and provide you with a nightlight to sleep with. Unfortunately, you cannot turn these lights off or dim them for complete darkness.

Bottom Line


This unit is no doubt an exceptional unit with user-friendly set-up and usage. It does have some drawbacks which include noise and bright light, but its ability to moisturize and purify a room allow you to overlook that drawback and invest in this item.

Largest Filterless Humidifier:
Ultrasonic Cool Mist Humidifier

Everlasting Comfort Humidifiers for Bedroom (6L) with Essential Oil Tray (White)

PROS

  • It is an Economical Unit Since it Does Not Require the Use of Filters
  • Comes With an Essential Oil Tray That Provides You With the Benefits of Aromatherapy
  • Has a Large Capacity, Allowing it to Be Used for 6 Days Straight Before the Need for Refill Arises

CONS

  • Filling it Too Much Can Cause This Humidifier to Leak

Our Review

This is one of the largest humidifier present in the market. It has a high output and large capacity with a tank of six liters. This unit has the ability to increase the levels of humidity in a large room and has a high mist output that is around 270 ml per hour. This cool mist humidifier can last for 50 hours straight and even works in rooms up to 400 square feet. The ultrasonic technology used in its manufacturing produces a silent frequency when working.

It also features an essential oil tray which you can use to add in your favorite essential oils, making this tray is similar to an oil diffuser. The fan on this unit then circulates the oil into the mist and provides you with a clean, fresh, and pure-smelling aroma. With the help of the 360-degree rotating nozzle, you can adjust the direction of the steam and mist easily no matter where the unit is preset.

You can also make use of the steam output knob and decide on the level of humidity you need in your room. This unit has the ability to reduce bacteria and airborne viruses present in the environment and keep you protected. It automatically shuts off the unit and prevents it from damage when the water level is low.

Bottom Line


This is an exceptional humidifier that has the ability to work for three days straight. It has excellent features such as improved sleep, clean environment, and auto shut-off abilities. All of these make this unit a good investment.

Best For the Whole House:
LEVOIT Humidifiers For Large Room

LEVOIT Humidifiers for Large Room Bedroom (6L), Warm and Cool Mist Ultrasonic Air Humidifier for Home Whole House Babies Room, Customized Humidity, Remote, Germ Free and Whisper-Quiet

PROS

  • Cleaning and Refilling the Tank is Exceptionally Easy
  • It is a Quiet Unit That Provides You With a Good Night Sleep
  • Has a Large Capacity That Allows it to Run for Thirty-Six Hours Straight
  • The Accurate Humidistat Helps in Providing You with the Amount of Humidity That You Will Like

CONS

  • It Leaves White Dust Behind
  • This Tank is High Maintenance and Will Require Regular Cleaning

Our Review

This Levoit humidifier is a unit designed for the entire house. It features three different mist levels at both warm and cool mist. Also, this unit helps in increasing the levels of humidity very quickly, even on a cool mist level. When choosing the warm mist setting, keep in mind that the water gets heated up internally which kills all kinds of bacteria present in it.

The display on this unit lets you know the humidity level in your household and allows you to set it to a comfortable and suitable level. Moreover, using the remote and touch control, you can change the settings easily for your convenience. The sensitive touch control panel on this unit is also user-friendly and easy to operate. Its huge capacity allows this to work for thirty-six hours straight on low mist levels.

The super, high level provides you with a mist output of 500 ml per hour and can handle big spaces like a living room, bedroom, and even an office. This unit works quietly due to the ultrasonic technology present and comes with aromatherapy and smart mode. This mode allows the unit to adjust the mist output on its own depending on the humidity level in your house.

Bottom Line


This is an exceptional product with a large water tank due to its amazing features, remote control, touch panels, LED screen, and modern and sleek design. The automatic humidity control and diffusion of essential oils make it a good humidifier to invest in and definitely compensates for the drawbacks this unit has.

Benefits of Investing in a Quality Filterless Humidifier

Filterless humidifiers are a great investment for your household. These units offer various benefits that make it stand out, but certain benefits are only specific to filterless humidifiers. These benefits include:

Quiet Operation

Unlike filtered humidifiers that have fans and other products to clean the water, these filterless units lack these things. For this reason, these items are very quiet and almost noiseless as compared to filtered units.

While some filterless humidifiers can make a buzzing sound, ultrasonic filterless humidifiers are the ones you should buy if sound is an issue. These ultrasonic humidifiers are completely quiet and will feel non-existent when in-use.

No Filters To Change

The cost of replacing filters can be very expensive, especially when you should be doing this every two weeks. For this reason, filtered humidifiers can be very expensive in the long run. Filterless units, on the other hand, are more affordable for the long-term due to the lack of filters. They require less time when setting up and are also cheaper.

More Energy Efficient

Humidifiers that use filters consume a lot more energy since they use powerful fans. This causes your electricity bill to empty your pockets along with buying filters every month.  Filterless humidifiers such as ultrasonic and impellers are extremely energy efficient. They also save money on your electricity bills.

Types of Filterless Humidifiers

Filterless humidifiers can be classified into two different types. These include cool mist humidifiers and warm mist humidifiers.

Warm Mist Filterless Humidifiers

Warm mist humidifiers have to be used carefully, especially if you have kids around. The reason behind this careful attitude is that these warm mist units make use of water that must be boiled before it is poured inside.

The steam that is produced is then emitted out in order to create moisture in the air. These warm mist humidifiers can cause burns when touching it. For this reason, they must be kept out of reach from children.

Cool Mist Filterless Humidifiers

These cool mist filterless humidifiers are then divided into three different types. These types include:

Ultrasonic Filterless Humidifiers

These units make use of a diaphragm that tends to vibrate at a frequency known as ultrasonic. This causes the unit to create water droplets which are then released in the form of mist. These types of humidifiers can emit either cool or warm mist only. Nowadays, you can get a dual mist ultrasonic humidifier that has the ability to emit cool and warm mist both.

Impeller Filterless Humidifier

These impeller units make use of a rotating disc that throws the water present inside at the diffuser. This diffuser then breaks this water into very fine and tiny droplets that can float out into the air. These droplets can be seen as a cool mist being released. However, maintaining these impeller humidifiers is extremely important.

Steam Filterless Humidifiers

These steam units work by heating and boiling the water present inside the unit at very high temperatures and then releasing the steam in the air. These units tend to release clean mist since the bacteria gets eliminated during the boiling procedure.

How to Clean a Filterless Humidifier

Keeping a humidifier clean must be your top priority. The reason behind this is that you'll be inhaling the air put out by this product. In order to clean this item, you will need some white vinegar and clean running water. Just disassemble your humidifier and clean the outside of the filter with a washcloth.

For the inside, simply pour in some white vinegar so that the entire base and corners of the item are covered with it. Once done, leave this for half an hour or more. Then simply wash away the vinegar with clean water and all the stuck-on residue will come off. You can also rub the stubborn dirt residue using a soft brush.

Conclusion

Humidifiers are an important part of households today. These products keep your house and environment moisturized and your skin smooth and soft. However, investing in these humidifiers can be a tough decision. To make this decision easy, we have combined the top filterless humidifiers present in the market with a buying guide to these units. We hope this helps to make your decision easier!