Saturday, January 28th, 2023

19 Best Essential Oil Diffusers for Large Rooms Today

Best Essential Oil Diffusers for Large Rooms

Have you ever paid attention to the way your house smells?

We often focus more on the feedback we get from our other senses. But if you think about it, any pungent smell can completely ruin an otherwise perfect home environment. So it makes sense to ensure that there is a pleasant and soothing aroma in your abode.

Essential oil diffusers make for an excellent way to have a pleasing fragrance in any closed space. But is that the only benefit derived from using essential oil diffusers? Certainly not, as some diffusers function as humidifiers too.

Essential oils, when humidified and dispersed in the air, can deliver aromatherapy to you and your guests. It can help in moistening skin, improving sleep quality, relieving stress, and reinforcing immunity.

Selecting the best essential oil diffuser from thousands of options can feel like finding a needle in a haystack. It gets even more challenging when you are looking for one for a large room because you want the aroma to cover a larger area.

Best Essential Oil Diffusers for Large Rooms

Best Essential Oil Diffusers

Without further ado, let us get straight to the details you should know about the best essential oil diffusers for large rooms available today. We have divided the recommended oil diffusers into two categories based on their types – Ultrasonic essential oil diffusers and Nebulizer essential oil diffusers .

Best Ultrasonic Diffusers

The ultrasonic essential oil diffuser is the most popular type of Essential Oil Diffuser in the market. They are simple and use water to disperse aroma and humidify the environment. Here are the 15 best ultrasonic diffusers you may consider buying.

1. SimpleTaste 4L Ultrasonic Cool Mist Humidifier & Essential Oil Diffuser

The numero uno spot on our list of recommended ultrasonic essential oil diffusers goes to the SimpleTaste Cool Mist Humidifier. It has a massive 4-liter water tank, which can last for 13 hours on the maximum mist. We especially liked its 360° rotatable nozzle, which allows effortless adjustment of mist direction.

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It has a touch button control panel & LED display for quickly changing any of the settings. We especially liked its built-in night light, which can change to seven colors. You will appreciate the sponge-style integrated slot for aroma diffusion – you only have to pour very few drops of essential oil on the sponge.

  • Uses Ultrasonic Technology to provide whisper-quiet operation
  • Includes a water filter, which lasts for approximately 500 hours before needing replacement
  • Will shut-off automatically when the water level is too low
  • Three mist settings – high, medium, and low
  • Features an in-built timer with four options
  • It can be a hassle to clean it as it does not have the most modular design 

2. URPOWER OD-A003 500ml

The second spot on our recommendations list goes to an oil diffuser from the reputed brand of URPOWER. The OD-A003 has an adequate tank capacity of 500ml, which lasts for about 10 hours. It features a stylish wood grain design on its base. The package includes the diffuser, its charger, user manual, and a measuring cup.

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We especially liked its automatic shut-off feature, which comes into play when the tank runs out of water. You can choose from various modes when using this device – continuous mist, 1-hour timer, 3-hour timer, 6-hour timer, mist only, and lights only. The LED light changes across seven different colors.

  • Comes with three timer options – 1-hour, 3-hour, and 6-hour
  • Excellent automatic shut-off function that prevents overheating when the tank is empty
  • Water tank is made of food-grade plastic; hence, it won’t be releasing any toxins in the air 
  • No latch or locking mechanism for the lid; you need to refill it at the spot where it will be used. Otherwise, you would be spilling water while carrying it around 

3. InnoGear Aromatherapy Essential Oil Diffuser 500ml

InnoGear offers an exceptional multi-function device that works as a humidifier, oil diffuser, air refresher, and night light. The Aromatherapy Essential Oil Diffuser has an impressive tank capacity of 500ml, which allows it to work for 15 hours before needing a refill. It can adequately cover an area of 269 square feet, so it is suitable for large rooms.

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We especially liked its whisper-quiet noise emission through top-notch ultrasonic technology. You can choose from four mist timers – 1 hour, 3 hours, 6 hours, and continuous mist. It features seven different colors for its LED lights, which you can turn off.

You can choose from two variations of this device – large and medium. Moreover, each variant is available in two colors – light and dark. It is a budget-friendly product, having a price tag of just 26 dollars.

  • Impressive auto shut-off feature that prevents overheating when water runs out in its tank
  • Features an elegant wood grain design that will complement all kinds of home décor
  • Thoughtful design has the power jack on the side and not at the bottom, which adds to your convenience 
  • It is not the most durable product on this list and could be more robust 

4. PureSpa Extra Large Premium Aroma Diffuser 2,000ml

The PureSpa XL Premium Aroma Diffuser has a whopping 2,000ml tank capacity. It can adequately cover an area of 350 square feet. It has dual mist modes – low mist has an approximate run time of 50 hours on a full tank, while high mist mode lasts for roughly 22 hours on a full tank.

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We especially liked its sleek design and rainbow-spectrum lights. You can choose to keep the light fixed on a specific color or rotate across colors. It also offers the flexibility to use the light and mist functions either simultaneously or individually.

  • Comes with a best-in-industry 5-year warranty
  • Features a massive tank capacity of 2 liters, so you won’t have to refill it frequently
  • Comes equipped with an Ultra-Quiet technology to ensure zero disturbances
  • Pure Enrichment offers top-notch customer service to address any issues you may face 
  • The cord is a bit shorter than standard length, which limits its usability 

5. Aromacare Zen Orb 600ml

The Zen Orb from Aromacare features a large tank that can hold up to 600ml of liquid, eliminating the need for frequent refills. It can easily cover an area of 200 square feet overnight on a full tank at the high mist mode setting. That reminds us, you can choose from two mist settings – low and high.

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We especially liked the elegant wood finish of this diffuser. Also, it features a noise level of fewer than 35 decibels, which translates to whisper-quiet. Aromacare offers the Zen Orb in three colors – dark wood grain, brown, and light brown.

  • Comes with a 45-day risk-free money-back warranty
  • Features two mist settings – low and high
  • Will shut off automatically when the tank is out of water
  • Equipped with a night light, which you can switch off if not required 
  • Initially, you might get low mist. It takes a couple of uses to reach peak mist ability 

6. Exqline Aroma Essential Oil Diffuser 1,500ml

Exqline offers the Aroma Essential Oil Diffuser, which has a large tank capacity of 1,500ml. It can humidify an area of 325 square feet. And it covers 450 square feet for aromatherapy. A full tank of water lasts for 10 to 20 hours, so you won’t have to refill it frequently.

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It features seven different colors of LED lights, which can be switched between bright and dim. We especially liked its control knob, which can be rotated 270° to control the humidity level. It produces less than 35 decibels of noise with the help of advanced ultrasonic technology.

  • Comes with a 1-year warranty and top-notch lifetime customer service
  • Used advanced ultrasonic technology to maintain a noise limit of 35 decibels
  • Large tank ensures that you do not have to refill it frequently
  • Functions efficiently as a humidifier as well if you do not add any essential oils 
  • You will have to lift the entire top part of the device each time you want to refill its tank, which can be a hassle 

7. ASAKUKI Ultrasonic Aromatherapy Premium Essential Oil Diffuser 700ml

If you are looking for a multi-function essential oil diffuser with a large tank, ASAKUKI offers just what you need! Its Premium Essential Oil Diffuser features a large 700ml tank, which translates to about 20 hours of working time.

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ASAKUKI has incorporated an advanced ultrasonic technology that keeps air humidity at the optimal 50% level. It achieves this by breaking up the water molecules evenly with the help of a 2.4MHz vibrating plate.

It is available in two colors – white and brown. It functions as a humidifier as well and features dual mist modes with seven different colors of LED lights.

  • Comes with a 6-month money-back guarantee and a 1-year warranty
  • You can use it in continuous mode or timer mode
  • It features an auto-off safety function to prevent overheating when its tank runs out of water 
  • Timer function is not 100% accurate; you may find that it keeps running beyond the selected time 

8. InnoGear Aromatherapy Wood Grain Diffuser 200ml

The InnoGear Aromatherapy Diffuser features an adequate tank capacity of 200ml. We especially liked its wood grain finish with a sleek LED light strip that changes across seven colors. You can choose from four timer settings – 1 hour, 3 hours, 6 hours, or steady on. It is available in two sizes – large and medium, and two color options – light and dark.

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The package contains the diffuser, its power adapter, and a user manual. If you do not find the power adapter in the package, do not panic – it is packed in the water tank. So you will have to open the diffuser cap to find it. It is not loud and has a noise output level of fewer than 36 decibels.

It costs 20 bucks only, so it is definitely worth giving it a shot!

  • Features a useful auto shut-off function, which is activated when the water level is too low
  • Two mist modes – strong and weak. You can easily switch between the two modes by long-pressing the mist button
  • Backed by a 1-year warranty, top-notch technical support, and speedy after-sale service 
  • With a tank capacity of 200ml, it may not suffice for large rooms, and you may have to refill it often 

9. Pure Enrichment MistAire Ultrasonic Cool Mist Humidifier

The MistAire Ultrasonic Cool Mist Humidifier is the second product from Pure Enrichment to make our list of recommendations. It can cover an area of 250 square feet and work continuously for 16 hours on a full tank (in high mist setting). Its large tank capacity of 1.5 liters ensures that you do not have to refill it frequently.

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Although it is a humidifier by definition, you can add a few drops of essential oil to its water tank to enjoy aromatherapy. We especially liked its 360-degree mist nozzle, which allows you to control the direction of the mist. Moreover, you can control the intensity by switching between high and low. It also features an optional night light.

  • Features an auto shut-off function that kicks in when the water level is too low
  • Comes with a 2-year warranty
  • Effortless to use and clean
  • Comes equipped with an optional night light 
  • Refilling is not as hassle-free as we would have liked and often leads to some spillage of water from the base 

10. ASAKUKI Essential Ultrasonic Aromatherapy Humidifier 500ml

ASAKUKI’s Essential Ultrasonic Aromatherapy Humidifier is an exceptional product. It features a large tank capacity of 500ml, allowing it to run for 10 to 16 hours. It can cover an approximate area of 300 square feet, making it ideal for large rooms.

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We especially liked the versatility of the functions of this device. It has two mist levels – high and low. You can choose from four timer options – 1 hour, 2 hours, 3 hours, or continuous. It also features seven different LED light colors, making it an excellent night light.

You can rest assured that this essential oil diffuser will make a great gift. We almost forgot to mention that it is available in three colors – dark wood, white wood, and yellow!

  • Comes with a 1-year warranty and a 6-month money-back guarantee
  • Made from high-quality, eco-friendly PP materials
  • Auto-off function to prevent overheating if the water runs out
  • Cleaning it is simple and time-saving 
  • Adapter plugs into the diffuser from beneath, which can be inconvenient 

11. URPOWER Square Aromatherapy Essential Oil Diffuser Humidifier 700ml

The third product from URPOWER to make this list is the Square Aromatherapy Essential Oil Diffuser. It is quite similar to the ASAKUKI Oil Diffuser we reviewed earlier, in terms of both look and functionality (sans the timer function). It is available in two color options – light and dark.

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We especially liked its dual mist option and 700ml-capacity large tank. You can expect it to work for 10 hours on high mist and 20 hours on low mist. It also features seven LED light colors and adjustable brightness. The package includes the diffuser, its adapter, and user manual.

  • Comes equipped with an advanced ultrasonic technology, which makes it whisper-quiet
  • Has an auto shut-off function that prevents overheating
  • Features seven different and soothing LED light colors
  • Cleaning it is reasonably straightforward 
  • Water condenses on the lid, and when you take it off, you will most likely spill some of that water

12. Pryzma Essentials Bluetooth Speaker Aromatherapy Essential Oil Diffuser

The only product on this list that also functions as a Bluetooth speaker – the Essential Oil Diffuser from Pryzma Essentials is an all-in-one product. It features a moderate tank capacity of 200ml, which enables it to run continuously for eight hours at most.

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It features an LED light, which can be allowed to cycle through seven colors, set to your favorite, or turned off. We especially liked its ultrasonic technology that ensures whisper-quiet operation. Its beautiful wood finish will surely go well with all kinds of home décor. The initial setup and syncing its Bluetooth speaker with your phone is as quick and straightforward as possible.

  • Features an in-built Bluetooth speaker, which is compatible with all mobile devices
  • Super quiet, thanks to its ultrasonic technology
  • Comes with an automatic shut-off feature which turns it off when the water level is very low
  • Elegant wood design that will look good in any home or office environment 
  • Although Bluetooth speaker is a thoughtful inclusion, it is not the best and cannot function as a dedicated music player 

13. Signstek 1.5L Ultrasonic Air Humidifier & Aroma Diffuser

Next on our list of recommendations is the Signstek Ultrasonic Air Humidifier and Aroma Diffuser. It features an impressive capacity of 1.5 liters, which can last for a maximum of six hours. We especially liked its dual nozzle sprayer design, which allows it to cover an area of 20 square meters adequately.


It features an LED light that changes across seven colors automatically. You may turn off the lights, but there is no option to select and fix one color. The automatic shut-off function ensures that it does not overheat when the water is over. You can adjust the mist intensity and direction. We recommend you to use water-soluble essential oils with this device.

You can choose from two versions of this product – windmill and dragonfly.

  • Works quietly and emits negligible noise
  • Straightforward to clean
  • Fatures an automatic shut-off function to prevent overheating when the tank runs out of water
  • Dual nozzle spray design ensures super heavy mist 
  • Not suitable for any room that has high humidity by default 

14. TaoTronics Essential Oil Diffuser 300ml

The TaoTronics Essential Oil Diffuser features an impressive tank capacity of 300 ml, which allows it to work continuously for eight hours. If you forget to turn it off, there is an automatic shut-off function that will do the needful when the water runs out.

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We especially liked its smart timer feature that allows the user to choose from four modes – 1 hour, 3 hours, 6 hours, or continuous. Its LED light changes through seven different soothing colors, which makes it an optimal night light. If you do not need the light, you can turn it off.

  • Features whisper-quiet operation to ensure you are not disturbed by it
  • Elegant, stylish wood grain base
  • Reasonably straightforward to use and clean
  • Comes with an automatic shut-off function to prevent overheating when the water runs out 
  • Adapter plugs into the diffuser from underneath, which can be inconvenient 

15. URPOWER Essential Oil Diffuser Humidifier Ultrasonic Aromatherapy 1,000ml

This URPOWER Oil Diffuser outdoes its predecessors on this list. With a large tank capacity of 1,000ml, you need not worry about refilling it often. Unlike the other products we have shortlisted, it comes with a wireless remote control that has a reading range up to five meters. You can conveniently control this device even when it is not right next to your bed or on your desk.


It has two mist modes – low and high. We especially liked its timer function, which allows you to select one of three operation times – 3 hours, 6 hours, or 9 hours. It also has a built-in night light, with seven different colors.

  • Comes with an auto shut-off function, which kicks in when the tank runs out of water
  • Can cover approximately 430 square feet and 269 square feet for aromatherapy and humidification, respectively
  • Wireless remote control adds a ton of comfort and flexibility
  • It can be cleaned easily 
  • If you want to switch it off, you have to unplug it altogether or click through all the colors using the remote 

Best Essential Oil Diffusers for Large Rooms 1

Best Nebulizer Diffusers

It is time to switch to Nebulizer Diffusers. They differ from Ultrasonic Diffusers as they operate without water. Nebulizers are not as popular though, so here are the four best options you should be looking at.

1. Sofia Waterless Nebulizing Essential Oil Diffuser

The numero uno spot on our list of recommended nebulizer diffusers goes to Sofia Nebulizing Essential Oil Diffuser offered by Pilgrim Collection. It has an unparalleled elegant design featuring an oak wood base and a handmade ceramic cover. The cover houses two glass reservoirs. Why two reservoirs, you may ask? So you do not have to clean each time you want to change the oil.

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It operates in a cycle of two minutes on and one minute off for two hours, after which it stops automatically. We especially liked its ambient LED light, which has a separate control for the meditation mode (wherein the light follows your breathing pattern).

  • 1-year warranty
  • Ambient LED light with a separate meditation mode
  • Features an auto shut-off function
  • Straightforward to use – just put five to ten drops of essential oil in one of the glass reservoirs and plug it in
  • Can be cleaned with a soft cloth and hot water
  • Not as quiet as you would like, and you will be able to hear its motor running 

2. SpaRoom Theralizer Waterless Micro-Air Essential Oil Nebulizer

Like the majority of nebulizers, the SpaRoom Theralizer operates in short bursts of two minutes, intermitted with one-minute breaks. There is no automatic shut-off function like ultrasonic diffusers, and it will work for two hours by default. If you want to shut it off sooner, you will have to do it manually.


It is capable of covering rooms having an area of 1,000 square feet. We especially liked its compact and elegant dark wood design. It contains a hand-blown glass container that has to be filled with 10 to 15 drops of essential oil. You can easily adjust the direction and intensity of the mist using the glass cap.

  • Features an exceptionally compact and elegant design
  • Can efficiently cover approximately 1,000 square feet of area
  • Working mechanism helps save electricity
  • Emits negligible noise unless you turn to the highest intensity, which will not be required 
  • Does not feature an auto shut-off function and has to be powered off manually when the oil is consumed 

3. Nebulizing Pure Essential Oil Aromatherapy Diffuser

Light Radiance by Organic Aromas is one of the most stylish diffusers on our list. It is also one of the tiniest, measuring merely 5 inches wide and 9 inches tall. It consists of a base made from 100% whole plantation hardwood and a beautiful hand-blown glass reservoir on top.

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We especially liked its LED rainbow-carousel lighting. You can turn it off if you don’t like it. Like most nebulizers, it works in a continuous cycle consisting of two minutes of diffusion time followed by one minute off. It has an operating time of two hours, after which it shuts down.

  • Comes with a 1-year free parts and service warranty
  • Features a whisper-quiet technology to ensure that you experience no disturbance
  • Effortless to clean – you need to rinse the glass reservoir once a week with isopropyl alcohol
  • Handmade with recycled materials 
  • The most expensive nebulizer product on this list 

4. Aromis Wood and Glass Aromatherapy Diffuser

Like the other nebulizer products we have reviewed, the Aromatherapy Diffuser from Aromis features a wood base and an all-natural glass case. This ensures that the essential oils do not come in contact with any plastic or artificial materials. Moreover, it preserves the healing properties of essential oils as no water or heat is used.

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It can cover up to 900 square feet of area. It has an operating cycle that consists of 10 minutes of diffusion followed by 10 minutes of no activity. This goes on for four hours, after which it automatically shuts off. We especially liked how simple it is to clean and maintain this device.

  • It comes with a 1-year warranty for parts
  • Does not emit any audible noise unless you use it at its maximum intensity
  • Aromis offers exceptional customer service, and you can get a quick replacement if needed 
  • It comes for 90 bucks, which makes it suitable for a niche segment of customers

Essential Oil Diffusers Buyers’ Guide

Choosing the best essential oil diffuser for your home can be tricky. The same goes for maintaining an oil diffuser. We have divided this comprehensive guide into two sections to address each of these issues separately.

Factors to Consider

There is no perfect generic product that would work optimally for all users, simply because of different requirements and aspects. To select the oil diffuser that will work best for you, you should consider the following factors.

1. Coverage

One of the first and essential questions you need to answer is what will is the area I want the diffuser to cover? Your selection will be based on whether you wish to place it in a large or a small room.

All of our recommendations work best in a large room. If you want to find the best essential oil diffuser for a small room, you can check out other products with a smaller water tank or smaller versions of our recommendations.

It is easy to ascertain the coverage area of an oil diffuser as the manufacturer almost always provides such information.


2. Type of Diffuser

Best essential oil diffusers can be divided into four categories – Ultrasonic, Nebulizer, Heat, and Evaporative. Of these, the last two are not as efficient as the first two. Hence, you will notice that our list includes only ultrasonic and nebulizer diffusers. So which of these two types is better? It is difficult to say as each has its set of pros and cons.

  • It disperses pure essential oil aroma.
  • There is no need to dilute essential oils with water.
  • It is usually more compact and elegant than ultrasonic diffusers.
  • It cannot work for extended periods; the usual run time is two to four hours.
  • It dilutes essential oil with water; hence, you would be using less oil than a nebulizer.
  • It can double as a humidifier due to the water, unlike nebulizers, which only work for aromatherapy.
  • It can work for longer durations, sometimes going up to 20 hours.
  • As it dilutes essential oil, the fragrance is weaker than that from a nebulizer.
  • It is not suitable for homes that have high humidity.

Based on these pros and cons of each type of essential oil diffuser, you should be able to determine which one is better for your home.

3. Noise Level

One of the downsides that most homeowners have experienced with oil diffusers is the noise they make. You cannot keep an oil diffuser in your bedroom if it is going to make an audible humming noise as it runs.

We have carefully selected products for our list that produce zero or negligible noise. The industry standard for acceptable noise output is 35 decibels when it comes to essential oil diffusers. Make sure that the product you select meets that benchmark.

4. Type of Essential Oil

Like there are thousands of essential oil diffusers out there, so are essential oils. Choosing the right kind of essential oils is vital for ensuring maximum utility of the diffuser. Most of the products we have reviewed work best with 100% pure and organic essential oils.

It does not take much to label a product as organic or 100% natural. We recommend you to check if the essential oil you are looking to buy has a USDA organic certification.

We recommend using water-soluble essential oils with ultrasonic diffusers. You can use any pure essential oil with nebulizers as they will not dilute it with water.

Tips and Tricks to Make the Most of Your Essential Oil Diffuser

  • You may have to use a new essential oil diffuser a couple of times for it to reach its maximum mist capacity. If you get low mists initially, do not jump to the conclusion that your oil diffuser is faulty. If the problem persists after using it a couple of times, contact the manufacturer.
  • As a rule of thumb, consciously add less water initially. Less water will result in more mist.
  • If the aroma weakens after several hours, you may add some drops of essential oil while diffusing.
  • Always place the diffuser on an even surface, when using it as well as when refilling it.
  • Ensure that the lid and base are correctly aligned after every refill.
  • If there is any water on the edge of the tank during refilling, wipe it with a cloth before using the diffuser.
  • Always use 100% pure essential oils to avoid corrosion.
  • If it will go long periods without being used, empty the water from the diffuser and let it dry.
  • Clean the device regularly; we recommend cleaning it with standard kitchen detergent after 3-4 uses.
  • Be sure to add water below the Max line in the tank.


Best essential oil diffusers provide a plethora of benefits along with aromatherapy. It can help you de-stress and relax. If you have visited a spa, you would have experienced a welcome and soothing wave of fragrance in the air, which is achieved with the help of essential oil diffusers.

We hope that our recommendations and comprehensive buyers’ guide help you select the best essential oil diffuser for your home or office.

Till next time!


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Anna Vaughn

Anna Vaughn

Immense painting experience recommends Anna. She shaped The Little Painters, a small local painting workshop for children that invites the little ones to explore painting through simple and creative means in a safe, loving and extremely colorful environment. In her home panting studio she plays with all paint mediums but watercolor is her expertise.

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