If you’re tired of dealing with dry air but don’t want the hassle of constantly replacing filters, an ultrasonic humidifier with no filter might be exactly what you need.
These smart little devices use ultrasonic technology to add soothing moisture to the air—quietly, efficiently, and without the ongoing cost of replacement filters.
I remember the first time I switched to one—it was such a relief not having to worry about extra maintenance, and the difference in air quality was almost instant.
In this guide, I’ll share the best ultrasonic humidifiers with no filter, along with a simple buying guide to help you pick the right one for your space.
Whether you’re looking for better sleep, healthier skin, or just a more comfortable home, there’s a perfect option waiting for you.
Humidifier Without Filters – How Do They Work?
Remember that not all humidifiers need filters to run.
In fact, an ultrasonic humidifier without a filter adds moisture to the air using high-frequency vibrations instead of a traditional wick or pad.
This makes them quieter, easier to maintain, and cheaper to use since you don’t need to buy replacement filters.
Instead of trapping impurities with a removable filter, these units often use built-in technologies like antibacterial materials, cartridges, or electrostatic systems to reduce minerals and bacteria.
However, because they don’t filter water as thoroughly, it’s best to use distilled or purified water to prevent white dust and keep the mist clean.
In short, filterless humidifiers:
- Keep the air comfortably moist
- Are simple to clean and maintain
- Save money on filter replacements
- Run quietly, making them great for bedrooms or nurseries
They may not remove every particle like filtered models, but for anyone wanting low-maintenance humidity relief, they’re a smart and affordable option.
7 Best Filterless Humidifier for Home
Like other ordinary humidifiers, filter-free humidifiers are available in two varieties: cool mist and warm mist.
Both of these come with a grid to remove the dust instead of filters and are therefore easy to use and clean.
As these humidifiers do not include filters, you only need to clean the outer body of your humidifier device at least once a week to avoid an unhygienic environment.
Just to make your comparison and buying decision more accessible, we have provided you with the best reviews below.
Check them out and pick the right one, no matter whether you need it for your off-grid living cabin, tiny house, earthship, or a fully equipped modern house.
1- Crane Filter-free Humidifier
The Crane White Drop is one of the best cool mist humidifiers with no filter, especially if you want something reliable for your baby’s room, plants, or even your office.
I love how this filterless-designed unit effortlessly keeps the air comfortable—no more dry skin, chapped lips, or stuffy sinuses during the night.
Plus, the teardrop design of this top-rated small filter-free humidifier looks modern and stylish, blending easily with any décor.
Here are a few standout features:
- 1-gallon tank with fewer refills and easy cleaning
- Adjustable mist control to match your comfort or your plants’ needs
- Automatic shut-off when water runs low for safety and peace of mind
- Quiet operation, perfect for nurseries and bedrooms
- Stylish Drop Collection designs to suit any room
Affordable, easy to maintain, and beautifully designed, this Crane USA filter-free humidifier is a practical choice for families and everyday users alike.
2- Vicks Filter-free Cool Mist Humidifier
If dry air has been sneaking into your nights and leaving you tossing, the Vicks Filter-Free Ultrasonic Humidifier might just be your new bedtime buddy.
With a roomy 1.2-gallon tank, it runs up to 30 hours—long enough to outlast even the most stubborn cold.
No filters to replace, no extra hassle—just fill this Vicks filterless humidifier device and let the gentle mist do its job.
It’s whisper-quiet, so you won’t hear a thing (except maybe your own snoring), and if you want to kick things up a notch, pop in a VapoPad for that classic Vicks comfort.
Perfect for kids’ rooms, big bedrooms, or anyone tired of waking up with desert-dry air.
Standout Perks:
- Up to 30 hours of continuous mist from one fill
- Filter-free setup—save money and sanity
- Practically silent while running
- Works with soothing VapoPads for extra relief
Believe me, this device can save you lots of cash every year, which you may spend on the upkeep of your baby’s health in other ways.
3- PureGuardian Ultrasonic Cool Mist Humidifier
PureGuardian comes in a very sleek and space-saving design and can be fitted anywhere in a corner.
If your room feels more like the Sahara than a sanctuary, this PureGuardian Ultrasonic Cool Mist Humidifier (H940AR) is here to save the day.
Compact yet efficient, it’s built for small spaces up to 350 sq. ft. and keeps the air comfortably hydrated for up to 30 hours on a single 0.5-gallon fill.
Best part is it’s filter-free, so you won’t have to spend extra on replacements—just simple, stress-free comfort.
The Silver Clean-treated tank is a smart touch in this PureGuardian filter-free ultrasonic humidifier, helping keep things fresher for longer.
Add in an aromatherapy tray (hello, lavender nights!), ultra-quiet operation, and a gentle night light, and you’ve got more than just a humidifier—you’ve got a cozy little upgrade for your space.
Highlights worth noting:
- Filterless design—no costly replacements
- Runs up to 30 hours on low with 0.5-gal capacity
- Silver Clean tech keeps the tank fresher
- Aromatherapy tray for essential oils
- Built-in night light and auto shut-off for peace of mind
4- Everlasting Comfort Humidifier without Filter
If you’re tired of waking up to dry air (and even drier skin), the Everlasting Comfort Cool Mist Humidifier is like a spa day for your room.
With a massive 6L tank, it runs for up to 50 hours—meaning fewer refills and more uninterrupted comfort.
Designed without filters, this Everlasting Comfort device saves you both money and hassle, while keeping maintenance refreshingly simple.
Covering up to 500 sq. ft., this humidifier is whisper-quiet, making it perfect for bedrooms, living spaces, or even your home office.
The built-in essential oil tray lets you infuse your favorite scents while enjoying the soothing mist, and the 360° nozzle ensures even distribution wherever you need it most.
Why It Stands Out:
- 6L tank with up to 50 hrs of runtime
- Filterless design for easy upkeep
- Covers spaces up to 500 sq. ft.
- Aromatherapy-ready with oil tray
- 360° mist nozzle + auto shut-off for safety
5- Raydrop Quiet Filterless Ultrasonic Humidifier
The Raydrop Quiet Ultrasonic Humidifier proves that comfort doesn’t have to take up space.
With its slim, vertical oval design, it fits neatly on nightstands, desks, or any small corner while still delivering a refreshing mist.
The 0.26-gallon tank in this Raydrop Filterless Ultrasonic Humidifier provides up to 6 hours of continuous use, making it just right for bedtime or work sessions.
Running at only 32dB, it’s nearly silent—great for nurseries, bedrooms, or quiet offices. A simple dial knob lets you adjust mist output with ease, while the smart indicator and auto shut-off add peace of mind.
To top it off, it’s backed by a 5-year warranty, giving you long-lasting reliability in a compact package.
Highlights:
- Space-saving design for small surfaces
- Whisper-quiet 32dB operation
- Adjustable mist via dial knob
- Auto shut-off + smart indicator
- Durable with 5-year warranty
6- Vicks Warm Mist Filter-free Humidifier
Vicks warm mist filterless humidifier V745A is specially designed to keep your room warm when it is freezing outside and a bit cool when it is too hot outside.
When the air in your home feels dry and scratchy, the Vicks Warm Mist Humidifier steps in like a cozy blanket for your lungs.
With a roomy 1-gallon tank, it runs up to 24 hours and easily covers spaces up to 600 sq. ft—perfect for bedrooms, nurseries, or even larger living areas.
Since this Vicks warm mist humidifier is filter-free, you won’t be stuck with ongoing replacement costs, just simple steam-powered comfort.
The gentle warm mist helps soothe coughs, congestion, and allergies, while the whisper-quiet operation makes it an ideal nighttime companion.
For an extra boost, you can add VapoSteam or essential oils, filling your room with the classic Vicks vapors everyone knows and loves.
Key Benefits:
- 1-gallon tank with up to 24 hours of runtime
- Warm mist adds moisture and relieves dryness
- Filter-free design with auto shut-off
- Compatible with VapoSteam for soothing vapors
- Quiet enough for peaceful sleep
7- Honeywell Warm Mist Filter-free Humidifier
If you’re looking for a no-fuss way to fight off dry winter air, the Honeywell HWM-705B Filter Free Warm Moisture Humidifier is a solid pick.
I love how ultra-quiet it is—you barely notice it running, yet the warm mist makes a huge difference in comfort.
It’s perfect for medium-sized rooms and works equally well in a home office, bedroom, or even a nursery.
What makes this Honeywell warm mist filterless humidifier stand out is the small details that make everyday use easier:
- 1-gallon tank with up to 24 hours of runtime
- Two mist settings (high/low) for customizable comfort
- Reset light to remind you when it’s time to refill
- Built-in medicine cup for liquid inhalants when you’re sick
- Filter-free design for simple cleaning and no extra costs
Overall, this Honeywell model is affordable, easy to maintain, and a great choice for anyone wanting better sleep, easier breathing, and cozy indoor air all winter long.
When Not to Use a Filterless Humidifier? (A Few Disadvantages)
Though using a humidifier that does not contain a filter is a trending idea, it is often not recommended to use them at home in certain situations and weather conditions.
Some of these may include:
✗ When you live in an area with high pollution
Dust, pollen, pet dander, and many other allergens can be a severe problem for many.
If you reside in an area with a high amount of dust or allergens around you, it is best to consider using a high-quality premium-grade filtered humidifier rather than a filter-free unit.
✗ When your tap water contains much salt or minerals
Using a filterless humidifier is generally not recommended when there are too many impurities present in your tap water or if you want to use hard water in your humidifier.
This is due to the fact that non-filtered humidifiers are not much efficient in removing these visible impurities or bacteria from the water.
These can hence cause further complex conditions, especially for those suffering from respiratory disorders, breathing problems, or allergies.
✗ When you have a sick infant or an asthmatic at home
Your sick baby or an asthmatic family member can be a matter of high concern for you.
The germs, smoke, and allergens present in the environment can worsen their condition, so if not filtered out properly, you should choose to have a filtered humidifier unit for them and not a filter-less device.
✗ When you want to use inhalants or aroma oils in a humidifier
Adding inhalants – like Vicks liquid in a humidifier – is a great way to relieve baby’s cold and other seasonal allergies.
But as filter-free humidifiers are less efficient in filtering, they may interfere with the inhalant and can increase the chances of getting the air contaminated.
If you want to use some specific inhalant or liquid in your unit regularly, it is best to get a warm mist humidifier or vaporizer with filters.
These are highly efficient in filtering the air before misting, thereby ensuring that you benefit most from these inhalants.
Important Features to Consider when Buying a Filterless Ultrasonic Humidifier
Modern filter-less humidifiers are available in various forms, like they can be warm, cool, or ultrasonic. Additionally, they may have many smart features.
Although all the features are not helpful, there are a few that are important for your use.
Some of the most common ones you should look at are as follows:
1- Usage
First of all, before purchasing the humidifier, it is important to think about where and for whom the unit will be used.
For instance, if you want to use it in a child’s room, then select a humidifier without a filter with a cool-mist, as they are completely safe and don’t have any risk of accidents with hot water.
2- Noise
The noise in cool mist and warm mist humidifiers is mainly because of the fan. And this noise varies depending on the speed you choose.
Generally, the fan will whisper at a slow speed, but at high speed, it will be loud and disturb you while you are sleeping. So, it’s good to test the humidifier before buying to check its noise level.
If you have no problem with running fan noise, you may purchase a humidifier with an operating noise of less than 30dB.
3- Humidistat
This feature in humidifiers maintains a healthy moisture level in your home automatically.
Hence, it is good to purchase a humidifier with a built-in humidistat due to which it turns off the machine when the desired humidity level is reached.
4- Auto shut-off
The auto shut-off feature avoids the risk of the humidifier breaking down and burning out.
Usually, the water reservoir needs to be refilled every 2 to 3 days. So, if you don’t keep on checking the water levels, you may face problems.
5- Night Light
Some humidifier brands have interchangeable night light settings, while some have power light indicators that act as a bright beacon in a dark room.
If you are a light sleeper, place the unit where you won’t be disturbed by the light, or you can also choose a humidifier that has a feature that lets you turn it off.
6- Coverage area
Generally, the medium-priced humidifiers have a coverage area of roughly 200 to 500 square feet. The higher the output, the faster your spaces reach the correct humidity.
So, when purchasing the humidifier, check the maximum coverage capacity and look for a high-capacity humidifier. It also works as a money saver, as you no longer have to spend on buying another one.
7- Water Tank Size
The size of the water tank will tell you about the coverage area and capacity, along with at what time you have to fill it.
Most humidifiers can run for 2 to 3 days if operated at their lowest setting, while some humidifiers can last only for a few hours, which is frustrating, especially if you have to run them for a whole night.
It’s good to buy a unit that comes with a water tank indicator. This reminds you to refill the reservoir when the tank drains.
8- Ease of Filling and Cleaning
Many humidifiers are difficult to refill, and spills are common when fitting the water reservoir.
So, it’s essential that you check that the tank used in a humidifier is easy to remove and refill, especially when you are buying a humidifier for the elderly.
To avoid harmful bacteria entering your home environment, maintaining your humidifier is also very important. Some filterless humidifiers have quirky shapes, and it’s very hard to reach places for their maintenance.
Therefore, when buying, you can read the reviews to check the ease of cleaning and working, and their complaints – the cleaning of the unit should be effortless.
9- Aromatherapy Options
Many humidifiers that don’t use filters come with a diffuser option, which is great for people who like the soothing qualities of aromatherapy oils.
From these types of humidifiers, they can humidify and scent their rooms with medicinal additives like lemon oil, tea tree, and many others.
Aromatherapy oils also lower stress levels, ease the level of depression, and act as an aid to mental well-being by relieving sinus and other respiratory issues.
10- Budget
A filter-free humidifier can be purchased for between $30 and $300 price range.
If you have only a small coverage area, then purchase a small unit humidifier and save some money.
But if you want to purchase a whole-house humidifier, you can buy a larger one. However, remember that they aren’t cheap, and you should consider the impact of a furnace humidifier on your indoor air before installing it.
The conclusion
Filterless humidifiers are a wonderful addition to any home—especially if you have kids or elderly family members who benefit from cleaner, more comfortable air.
They’re affordable, low-maintenance, and available in different sizes and styles, so you can easily find one that fits your needs without overspending.
That said, whether you choose a filter-free or a filtered humidifier, proper cleaning and maintenance are key.
Always follow the manufacturer’s instructions to keep your unit running safely and efficiently. With the right care, you’ll enjoy healthy, risk-free humidification without the hassle.
Meen Smith is a nurse by profession who loves writing online, spending time with her family and caring for the elderly. She has already worked as an associate editor on various moms, babies, home appliances, kitchen, and healthy living blogs. In her spare time, she also enjoys drawing, reading/writing kindle eBooks and improving her skills a bit.