Top 10 Best Ultrasonic Diffusers for 2024: A Buying Guide

There are thousands of different brands and types of ultrasonic essential oil diffusers in the market. Since 2016, essential oils and diffusers have become popular home health items. Every year, new oils and diffusers come out. Diffusers have become very technologically advanced. Some use remote controls, while others have apps. It can get confusing trying to figure out what to buy. I decided to go out, scour the internet, and select the best essential oil diffusers for 2020.

We tested and analyzed 100s of diffusers and came up with the 10 best ultrasonic diffusers you can buy in 2020. Before diving in, let’s go over the types of diffusers you can buy.

 Types Of Diffusers

Diffusers disperse essential oils (highly concentrated extracts from flowers, plant parts, and leaves) into the air. Essential oils have healing properties. To take in these healing benefits, you can inhale them, apply them topically, and in some cases, ingest them. Diffusers help you inhale the oil’s aroma.

There are various types of oil diffusers. Each type works differently. All of them have the primary purpose of spreading the scent through the air.

Ceramic Diffuser

This type of diffuser is made out of ceramic and sometimes terra cotta. It allows oils to evaporate and disperse into the air. A couple of drops of essential oil placed onto a terra cotta or ceramic diffuser is all you need. Ceramic diffusers work well for personal use in a small area. They are not ideal for large or outdoor areas.

Reed Diffuser

Reed diffusers are the ones that use rattan sticks. These sticks (reeds) allow the oil to wick up through capillary action. It draws the fragrance up the reed with the oil. The essential oils evaporate on exposure to the air, thus scenting the room. You need a carrier oil to make reed diffusers work. Your essential oils mix in with the carrier oil. Reed diffusers last about 1 month per ounce of carrier oil.

Candle Diffuser

A candle diffuser uses heat from the candle flame to help essential oils evaporate into the air. Thicker oils work better for heat diffusers. Sandalwood is an excellent oil for candle diffusers.

Nebulizer Diffuser

Nebulizing diffusers do not use any water to work. Instead, this type uses an atomizer. It’s a device that transforms oils into a mist. Vapes have atomizers, too. Oil particles are diffused into the air by the heat from the atomizer. This mist is powerful because the oil does not have water.

Ultrasonic Diffuser

Unlike a nebulizer diffuser, ultrasonic aroma diffusers need water to work. An ultrasonic diffuser, sometimes called an electric diffuser, disperses essential oils into the air. Ultrasonic diffusers work by using ultrasonic vibrations. These vibrations break down the essential oil particles into micro-molecules. It then diffusers into the air as negative ions. Learn more about how ultrasonic diffusers work. These are the most popular types of diffusers. You will see this type next to the essential oils in your big-box retailers.

What To Look For In An Ultrasonic Diffuser: Our Criteria

We came up with six criteria to help us narrow down the best rated ultrasonic diffusers you can buy in 2020. These criteria are the most important features in a diffuser. Each diffuser we listed does well under these six criteria.


The design of a diffuser is important. Diffusers need to match with your interior. Diffusers are made out of many kinds of materials. Plastic, wood, and glass are popular. Some diffusers have night lights. Some even have remote controls. We considered all of these styles in our reviews.

Operating Time

Some diffusers last longer than others. Some have timers. Timers help lengthen the amount of time mist is dispersed in the air. The length of time is partly determined by how much water it can hold.

Capacity of Reservoir

How many milliliters of water can it hold? We wanted to make sure the top diffuser we recommend holds a large amount of water.


Not all diffusers are capable of filling up a large room. We wanted to make sure we had some diffusers that had good coverage.

Noise Level

Some electric diffusers can get noisy. A high noise level can interrupt your sleep or meditation practice. So we chose the quietest diffusers.


Diffusers don’t last forever, but they should last a long time. Some diffusers have warranties. We prioritized the ones that do have warranties and reasonable return/exchange policies.

Essential Oil Diffuser Reviews: Top 10 List

This diffuser is for space lovers. It is not your typical plastic, plain diffuser. This 3D glass galaxy diffuser has 3D starburst LED lights. It can turn your bedroom, living room, or children’s room into a 5-star luxurious spa. Great for kids. The captivating starburst LED galaxy lights to create a soothing atmosphere in your home. One of the coolest essential oil humidifiers that claim our #10 spot.

Key Features:

  • Galaxy star design in a circular
  • Made out of silver glass
  • Switch between 7 colors
  • Mist volume control
  • Light on/off button
Design: The 3D glass galaxy diffuser has a round, circle shape. The base is black and made out of plastic.
Operating Time: 6-8 hour run time
Capacity: 200ml
Coverage: About 400 square feet
Noise Level: Low
Warranty: 1-year warranty

This wood grain diffuser by CARYON has a unique and sleek design. The cover looks like a super modern wood grain shaped like a beautiful flower vase. The design and shape will go very well with any type of decor. It acts as a decorative piece that will get you compliments. We suggest placing this in a living room, bedroom, spa, salon, or yoga studio.

Key Features:

  • Sophisticated wood grain texture made out of plastic.
  • It can be used as a small humidifier without oils.
  • Larger Water Capacity
  • 4 Timer Settings: 1H/3H/6H/ON;
  • 2 Misting Modes: low and high
  • 7 soothing LED lights that you can cycle through keep one static color.
  • Each light can be set to dim or bright mode
  • Automatically shut off when water runs out of water
Design: Modern and sleek with wood grain design.
Operating Time: 7-10 hours misting time
Capacity: 400ml
Coverage: 215-269 sq. ft.
Noise Level: Very Quiet
Warranty: You may be charged a restocking fee up to 50% of item’s price for used or damaged returns and up to 100% for a materially different item.

This bronze art diffuser is designed with beautiful looking Moroccan/Mediterranean flowers and patterns. This can go well in a bohemian-chic style interior. It has classic flower patterns, and the surface is made of high-grade gold bronze. Customers say it is “exotic” and “decorative.” We agree! If the noise level is an issue for you, this may not be the best one. Customers say that the motor makes a noticeable, high-pitched noise.

Key Features:

  • The cover is made of wrought iron with a flower metal design.
  • 4 time modes for ON (continuous spray)
  • 7 colors of light
  • Does not contain BPA
Design: Exotic bohemian look. Made of wrought iron and has a flower design.
Operating Time: 6-8 hours
Capacity: 500ml
Coverage: 215-269 sq. ft.
Noise Level: Medium
Warranty: 100% money-back guarantee (prerequisite: return the original product so that the merchant can conduct technical research)

This wooden petal shaped diffuser looks unlike any other. It comes in two different wood colors: dark and yellow. Not too many serious issues have been reported. Many customers love the ease of use and quality. This item comes with a remote. It allows you can control the diffuser without having the walk up to it. Perfect for people who want more convenience.

Key Features:

  • Remote control, ultra-quiet design
  • Waterless Auto-Off
  • 4 Time settings
  • 14 colorful soothing LED lights to change
Design: Modern wood grain design.
Operating Time: 4 Time Settings: 1 hour/ 3 hours/ 6 hours/ Steady On (10 hours)
Capacity: 400ml
Coverage: Standard sized bedroom
Noise Level: Low
Warranty: Free returns are available for the shipping address you chose. You can return the item for any reason in either new or unused condition and get a full refund: no shipping charges.

This item is the best wifi smart diffuser in our list. This diffuser is one of the more luxurious ones we’ve seen. It is also very technologically advanced with wifi/smart home capabilities. You can download the app and connect it to your Alexa or Google Home accounts. Use your voice to control your smart diffuser, including colors, mist settings, and other functions. Very easy to use and set up.

Key Features:

  • Voice control: Alexa and Google Home compatible
  • Download the companion app to control features.
  • Create regular schedules in the app
  • Choose any color, unlimited colors.
  • Flexible timer
Design: Elegant and smart. Dark wood grain design.
Operating Time: Up to 12 hours of continuous mist.
Capacity: 400ml water tank
Coverage: Standard room size
Noise Level: Low
Warranty: Complimentary 1-year warranty

This premium iron cover diffuser is elegant, unique, and durable. The cover is not made out of cheap plastic or fake wood. If you look closely, you can see the outlines of trees. With the LED lights on, you will see a colorful forest. Customers say it is easy to use and well made. It looks great in your home! This is a larger diffuser and can hold 500mL of water. This item is perfect for people who have larger homes and want to keep it on for longer.

Key Features:

  • You can select between 7 different colors
  • Can be used as a nightlight
  • Set to mist constantly for 24 hours
  • Choose the mist strength cycle
  • Auto shut-off function
Design: Premium iron cover designed to show forest and trees.
Operating Time: 24 Hours
Capacity: 500mL
Coverage: Large room
Noise Level: Moderate, makes white noise
Warranty: 100% satisfaction guarantee. If you are not completely thrilled with your premium Aroma Outfitters Iron Diffuser, then we will give you a full refund!

This unique salt lamp oil diffuser is one you should not miss. This item acts as a 2-in-1 Himalayan salt rock lamp and essential oil diffuser. You can use both simultaneously or separately. Customers like the ability to use this as a lamp and a diffuser. If you don’t want the light, you can turn it off while keeping the diffuser on. This item not only allows you to reap the benefits of essential oils. You can benefit from the Himalayan salt crystals! These crystals are designed to help boost your mood and increase energy levels. The crystals can neutralize the positively charged ions that emit from electronic devices like smartphones, televisions, radios, and more. A great combo!

Key Features:

  • Original patent-pending salt lamp and aroma diffuser
  • 5 adjustable light levels
  • Salt crystals naturally mined in Pakistan
  • 3 10-watt halogen light bulbs
Design: Modern 2-in-1 Himalayan salt lamp and diffuser
Operating Time: up to 6 hours
Capacity: 160ml
Coverage: 160 sq. ft.
Noise Level: Medium
Warranty: 5 Year Warranty

The Droplet Diffuser by Rocky Mountain Oils comes in at our #3 best diffuser. This is one of the more affordable options on our list. Essential oils can get expensive, so it might be an excellent option to save on your diffuser. The top of the diffuser turns different colors. Rotate for a fun mix of blue, green, purple, and red as you diffuse. This diffuser is small and compact. It is excellent for your home office and small living rooms. If you have a minimal office or apartment, this is the one to get.

Key Features:

  • Four different color options
  • Two operating modes: Continuous and Off
  • Three light modes: Color Rotating (blue, green, purple and red), Fixed and Off
  • Powered by USB
  • Voltage: DC 5 V
  • BPA free
Design: Minimalist design that looks great anywhere.
Operating Time: 6 hours
Capacity: 150 ml
Coverage: 400 square foot coverage
Noise Level: Low
Warranty: one-year manufacturer warranty

This white plastic diffuser is one of the more luxurious ones on our list. The top reviews and extensive set of features put this in our second spot. This diffuser has unique OneFill technology. With one single fill (around 1.5ml / 30-40 drops), the scent will last 11-15 hours in low mode and 6-10 hours in high mode. With a large water capacity, you can keep this running throughout the day. Do not worry about this running out. Accordingly to the size of your room, you can adjust the mist level between low and high modes by pressing the power button. Customers love the looks and very low noise level. This diffuser is perfect for meditation.

Key Features:

  • Patented oil flow system
  • Comes in three colors
  • BPA Free
  • 1H/4H/8H/Continuous
  • Auto on-off function
  • Two mode-Fine & Smooth mist
Design: Modern, minimal, elegant white design that compliments any elegant room.
Operating Time: 6-10h(High Mist) 10-15h(Low Mist)
Capacity: 500 ml
Coverage: Large room
Noise Level: Minimal
Warranty: 90 days free return

The #1 best ultrasonic essential oil diffuser is the Lux Blue Marble Diffuser by Rocky Mountain Oils. This diffuser tops our list because of it’s looks, quality, materials, and top customer reviews. You want a diffuser to last throughout the day and fill up your home. This is best essential oil diffuser for a large space. The Lux Blue Marble Diffuser works great in large rooms and offices. The Marble Diffuser is big enough to be used just about anywhere. The marble glass covering is mesmerizing. It does not look like any other diffuser in the market. It is beautiful. Good enough to show off to your visitors or give as a gift. You can use this as a nightlight. There are 4 different colors. It can run with the lights turned off. It only has the options for continuous run and off—no intermittent. If you want a showstopper, high quality, large diffuser, get this one.

Key Features:

  • Best for a large space.
  • Two operating modes: Continuous and Off
  • Color Rotating (blue, green, purple and red)
  • Option to turn the color rotating background off.
  • BPA free
Design: Thick glass modern design with unique LED color illumination
Operating Time: 6 hours continuous run time
Capacity: 170 ml
Coverage: 1,000 square foot coverage
Noise Level: Low
Warranty: one-year manufacturer warranty.

Buy Your Diffuser Now

Now that you know which ultrasonic diffusers are the best one to buy in 2020. Go and get one. There are many places to buy a diffuser. Check sites that have special promotions. Rocky Mountain Oils has sales every month. Catch good deals there or check on Amazon. Always make sure that there is a good return policy and at least a 1-year manufacturer’s warranty. We hope you enjoyed this essential oils diffuser guide! Don’t forget to also buy essential oils online. Let us know if you have any questions.


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