Best Ultrasonic Diffuser Reviews 2017 – Full Buyer’s Guide

Best Ultrasonic Diffuser


There’s something so refreshing about walking into a room where the air is filled with the soothing scent of essential oil.

From lavender to lemon to sandalwood and everything in-between, essential oils and aromatherapy are becoming more popular now than ever before.

They have the power to calm your nerves, energize your mind and provide comfort when you’re stressed.

The most effective way to fill any space with the soothing scent of your favorite essential oil is to use an ultrasonic diffuser.

Ultrasonic diffusers double as humidifiers, making them especially useful in any climate, building or home where the air is dry.

They also come with light options and in a variety of designs.

There are several aspects to consider when you’re choosing the best ultrasonic diffuser for your space. In this article, we will be covering all of the most important elements to help you find the perfect one.

Best Ultrasonic Diffuser Comparison and Reviews

Whether you’re looking for a decorative ultrasonic diffuser or a portable one, here’s a diverse list of some of the best on the market today.

In order to find the right one for you, consider the size of the room you want to use it in. The diffusers with the largest reservoirs last longer and work best in larger spaces.

Each diffuser comes with its own set of unique features, including power modes, light settings, and automatic shut-off.

Brand NameWater TankRun TimeAromatherapy AreaAuto Shut Off 
Radha Beauty120 MLUp to 5 Hours250 sq. ftYesRead Review
Island’s Miracle170 MLUp to 6 Hours800 sq. ftYesRead Review
H2EO Ultrasonic100 MLUp to 4 Hours200 sq. ftYesRead Review
MUJI Aroma100 MLUp to 6 Hours350 sq. ftYesRead Review
Now Foods500 MLUp to 6 Hours400 sq. ftYesRead Review
SpaRoom175 MLUp to 4 Hours200 sq. ftYesRead Review
URPOWER500 MLUp to 10 Hours430 sq. ftYesRead Review
GreenAir150 MLUp to 4 Hours250 sq. ftYesRead Review
QUOOZ200 MLUp to 10 Hours250 sq. ftYesRead Review
InnoGear100 MLUp to 6 Hours250 sq. ftYesRead Review

What is an Ultrasonic Diffuser?

An ultrasonic diffuser is one of several different types of essential oil diffusers. These devices are most commonly used for aromatherapy purposes, but the special thing about ultrasonic diffusers in particular is that they also purify the air as well.

Some other unique aspects of this type of diffuser is that it doubles as a humidifier and can also be used as a lamp or night light. Many of them are available in decorative designs that look great as home décor.

An ultrasonic diffuser is the best choice for larger rooms and children’s rooms. Unlike other types of diffusers, this one can handle any kind of essential oil. It’s also the quietest and is generally easy to operate and maintain.

Many ultrasonic diffusers are portable and come with timers and automatic shut-off features, which make them perfect for traveling and use in a number of environments, from home to the office to a yoga studio.

1. Radha Beauty Aromatherapy – 7 colors Portable Ultrasonic

This 120 ml portable cool mist ultrasonic diffuser is designed with several great features. The waterless automatic shut-off will turn the diffuser off automatically when it runs out of water. It also comes with an adjustable mist mode, which allows you to control the amount of mist dispersed.

You can set it to run in 30-second intervals or to run continuously.

This diffuser comes with seven different colored LED light options. You can change the color as well as the intensity of the light. You can use it as a lamp as well by keeping the light on without running the diffuser.

Its long cord is another convenient feature which allows you to place it anywhere you want to with no trouble.

To fill the diffuser, you simply twist the lid to the left, add water to the fill line or use the measuring cup that comes with it, add 2-3 drops of your favorite essential oil, twist the lid back on, adjust your settings, and you’re good to go.

With the auto shut-off feature, you don’t have to worry about the machine breaking when the water runs out.

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  • Waterless auto-shut off
  • Adjustable mist mode
  • Several light options
  • Long cord

  • Indicator light stays on when light is off
  • Doesn’t hold a lot of water compared to other diffusers

2. Island’s Miracle – Best Ultrasonic Oil Diffuser

This cool mist diffuser holds 170 ml. of water and comes with an auto shut-off feature, so you don’t have to worry about it running with no water inside.

It will run for up to six hours when completely filled and works effectively in rooms from 100 sq. ft. to 800 sq. ft.

The unique and beautiful leaf patterned design on this diffuser makes it a great decorative piece for any room. You can choose from seven pastel colored LED lights that illuminate the leaves.

You can set it on a solid color or a light rotation mode. The best part is that it can also run completely dark when the lights are off.

This diffuser comes with a user’s manual but is very easy to use. You simply plug it in, remove the top, add water to the fill line with 3-4 drops of your favorite essential oil, replace the top and push the button to get it started.

It comes with a handy cleaning brush to keep maintenance easy.

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  • Beautiful decorative design
  • Very easy to use
  • Runs for up to six hours
  • Waterless auto shut-off

  • Runs continuously with no interval or intensity settings

3. H2EO Ultrasonic Diffuser – Multi-Colored Lights Model

This diffuser is designed with a futuristic, modern aesthetic. Unlike most other diffusers, which are tall and thin, this one sits low and wide with a transparent top. It comes with a wide range of features and settings, including a switch-mode power adapter that provides energy-efficient operation.

It works effectively in medium to large sized rooms that measure from 1500-2200 cubic feet. One of the best features of this diffuser is that you can choose from four intermittent settings for diffusion if you don’t want it to run continuously.

You can also choose to run it in continuous diffusion mode if you please. It also features high, medium or low intensity settings and will automatically shut off when the water level is low.

It comes with four different colored LED light display options, which can all be shut off. When the lights are off, it can run as a diffuser with no light disturbance at all.

It is important to note that this diffuser does not take carrier oils, which are thicker oils like coconut, sesame or almond.

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  • Many features
  • Four intermittent settings
  • Three intensity settings
  • Four light settings

  • Not the best decorative piece
  • Cannot use carrier oils

4. MUJI Aroma Diffuser 11SS – Ultrasonic Waves with Light

This 100 ml diffuser is imported from Japan. You can run it for up to three hours when completely filled. It’s effective for smaller to medium sized rooms of 105 sq. ft. to 350 sq. ft.

You can choose from four intermittent settings and it also includes an auto shut-off feature that shuts the diffuser off when the water level is low.

Instructions are not written in English, but it is super easy to operate. Simply open the top, fill water to the fill line, add 2-3 drops of your favorite essential oil, close the top, and hold the mist button down for a few seconds.

The diffuser will start running when the green indicator light turns on.

If you want to use the diffuser on light mode only, there are two light settings for you. Simply press the light switch and set the light on high or low, or turn it off completely. The diffuser can still be used when the light is completely off.

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  • Easy to use
  • Four intermittent settings
  • Two light settings
  • Auto shut-off when water level is low

  • Small reservoir compared with other diffusers
  • Instructions are written in Japanese

5. Now Foods Ultrasonic Oil Diffuser – Wood Grain

This beautiful 500 ml. ultrasonic diffuser makes a great natural looking décor piece for your home, office, or any room where you want a decorative touch. It’s made with a flower-shaped, faux wood grain design that is both unique and BPA-free.

This diffuser runs for up to eight hours when filled completely and it covers a 400 sq. ft. space effectively. It also has a waterless auto shut-off feature, so you don’t have to remember to shut it off when the water runs out.

To use this diffuser, simply twist off the top, fill water to the fill line, add 10 drops of your favorite essential oil and screw the top back on.

Push the power button once and the diffuser will turn on with the light.

Push the button twice and the light will turn off while the diffuser stays running.

Push the button three times to turn off the light and diffuser.

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  • Beautiful natural looking design makes great décor item
  • Runs for a long time compared with other diffusers
  • Waterless auto shut-off

  • No interval or mist intensity settings
  • Cannot turn indicator light off

6. SpaRoom Spa-Mist Ultrasonic – Best Ultrasonic Diffuser for Essential Oils

This 175 ml ultrasonic diffuser runs for up to four hours when filled completely. It works effectively in spaces of 150 sq. ft. to 200 sq. ft. with just a few drops of your favorite essential oil. It’s made of BPA-free plastic, which is sturdy and won’t break easily.

This is a very basic and simple ultrasonic diffuser. It comes with an instruction manual and a scraper brush for convenient cleaning. There are a couple of different light settings for the pastel light it emits through the white matte-finish cover.

You can choose a solid color light or keep the lights rotating for a peaceful, calming effect.

Using this diffuser is very simple. You just have to open the top, fill the water to the fill line, add 1-2 drops of your favorite essential oil, close the top and turn it on.

You can switch the light mode from solid color lights to rotating lights, or turn the lights off completely.

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  • Basic and easy to use
  • Comes with cleaning brush for convenient maintenance
  • Different light settings

  • Not effective as a humidifier
  • No Intermittent or mist intensity settings

7. URPOWER 500ml – Best Ultrasonic Essential Oil Diffuser

This is a large ultrasonic diffuser that’s loaded with features and settings. It comes with a 500 ml water reservoir for your oils, which keeps it running for up to 10 hours when filled completely.

It’s effective as a humidifier, essential oil diffuser, air purifier, night light or lamp and as an ionizer. It works in spaces of 400 sq. ft. to 900 sq. ft.

You can choose from three intermittent timer settings, from 60 minutes to 180 minutes, or leave it running continuously. The waterless auto shut-off feature will turn the machine off on its own when it runs out of water, so you don’t have to worry about turning it off yourself.

There are also two settings for mist intensity.

It’s designed with seven different colored LED lights under a matte finish cover. The lights are never too bright, but provide a warm, calming illumination. You can choose to have the colors rotate automatically or set it on one solid color.

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  • Mist intensity and interval settings
  • Waterless auto shut-off
  • One of the longest running ultrasonic diffusers – up to 10 hours
  • Effective in large spaces – up to 900 sq. ft.

  • Must be cleaned at least once every week

8. GreenAir SpaVapor+ Instant Wellness – Best Green Air Ultrasonic Diffuser

This is a 150 ml. BPA-free plastic ultrasonic diffuser. The most unique aspect of this one is that it’s built using ceramic discs instead of metal. The ceramic discs lengthen the life of the machine and prevent oil corrosion as compared with metal. It works effectively for up to four hours in spaces up to 250 sq. ft.

This diffuser uses patented ultrasonic technology that allows it to use any type of essential oil and create a super-fine mist of it. This helps the oil and scent stay in the air longer, providing better aromatherapy and air purifying benefits.

Additional features include directional misting and a waterless auto shut-off function. It also uses six rotating LED lights under a matte finish cover. You can set the lights to rotate, stay on one solid color, or shut off completely.

To use this diffuser, fill the reservoir halfway with warm tap water. Add 5-6 drops of your favorite essential oil and use a cup to slowly fill the reservoir to the fill line once it begins misting.

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  • Ceramic discs provide better function and longer life than metal
  • Uses patented ultrasonic technology for super-fine mist
  • Directional misting
  • Waterless auto shut-off

  • Cannot use cold or purified water
  • A bit complicated to fill compared with other diffusers

9. QUOOZ Lull – Best Rated Ultrasonic Diffuser

This is a beautiful, decorative diffuser with a 200 ml water capacity. The large reservoir keeps it operating for 8-10 hours. It comes with two mist intensity settings, which allows you to use it effectively in larger or smaller rooms without wasting oils.

There is also an auto shut-off feature that turns the device off automatically when the water is running low.

The beautiful and unique flower design makes this diffuser a great home décor piece. It’s made of BPA-free plastic, but looks like glass. An LED light illuminates the diffuser and comes with a brightness setting.

Another unique feature of this diffuser is the ‘breathing’ mode for the light. This mode makes the light gradually brighten and dim in a realistic breathing pattern. This feature makes the device very helpful with meditation or breathing exercises.

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  • Beautiful decorative diffuser
  • Large capacity keeps it running for 8-10 hours
  • Auto shut-off feature when water level is low
  • Unique ‘breathing’ feature for light is helpful aid for meditation and breathing exercises

  • If you use heavier oils, you have to wipe the diffuser after each use

10. InnoGear Aromatherapy Essential Oil Diffuser – for Home Office Bedroom Room

The last diffuser on our list is a 100 ml portable ultrasonic diffuser. Although it’s small, it’s loaded with features and works well as a humidifier in small to medium sized rooms. It provides three different working options.

You can set it on continuous mist mode, intermittent mist mode for misting every 30 seconds, or turn the diffuser off and use it as a light only.

It will run for up to three hours in continuous mist mode, or six hours in intermittent mist mode.

It comes with seven different colored LED lights. You can adjust the brightness of the lights, set them on a rotational mode, or choose just one solid color.

It’s built with a six foot power cord, which gives you plenty of options when placing it in a room.

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  • Waterless auto-shut off
  • Intermittent mist settings
  • Various lighting options
  • Long 6 ft. cord

  • Tends to get warm, so not great for cool misting
  • No mist intensity settings

Ultrasonic Diffuser – How does it Work?

Ultrasonic diffusers are super easy to use, and the best part about them is that you can add any of the essential oils you like. Many other diffusers cannot handle certain thicker oils, but the ultrasonic diffuser works with any and all types.

Unlike other diffusers, ultrasonic diffusers do not utilize heat to evaporate oils, which is why you can use any type of oil in them. This characteristic also makes them the safest to use in children’s rooms and provides the most effective therapeutic benefits as heat alters the chemistry of the oils that you’re diffusing.

These diffusers are unique in that they use electronic frequencies to disperse oil into the air instead of using heat.

The frequencies emitted by the diffuser create vibrations in the water, which are carried to the surface of the water where the essential oil floats. The oil is then vaporized by these vibrations and dispersed into the air.

As the essential oils in the water of the diffuser are broken down, they are released into the air along with natural ozone, which improves the quality of the air around you.

The scent remains in the air with the particles of oil for several hours.

The Bottom Line

As you can see, not all ultrasonic diffusers are created alike. The best ultrasonic diffuser is the one that will work best for you considering the space you want to use it in and various other aspects.

One thing is for sure though – whether you are drawn to the beautiful flower-shaped decorative diffusers, the basic portable diffusers, or the diffusers with loads of features and settings, they all provide the same set of benefits.

Every ultrasonic diffuser on our list will fill your room with the soothing scent of your favorite essential oil. They’re great for relaxation and meditation, or simply for purifying and deodorizing the air around you effectively.

They also all double as humidifiers, which makes each one ideal for dry air climates. The humidifying feature comes in really handy during winters when you have to keep the heat on full blast. It will also help relieve symptoms from colds and the flu and help keep your sinuses clear.

Ultrasonic diffusers are the ultimate aromatherapy devices with added features that no other diffuser can match.

We hope that this guide has provided you with all the information you need to choose the best one for you and your room.

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