Best Oil Diffuser for Large Room Coverage




Using essential oils for their health benefits is one of the oldest and still most trusted methods of easing anxious minds and soothing ailing bodies. While essential oils can be consumed or applied to the skin, if you want to access the full potential of their healing properties it’s best to use a diffuser. It’s also a great way to purify and cleanse air, adding a fresh and inviting aroma to your home and workplace.

If you have a large room or office, some smaller diffusers simply won’t emit enough mist to effectively fill the space. A large aromatherapy diffuser will provide more mist, for a longer time and is the best diffuser for large room situations.

I’ve researched the best essential oil diffuser for large room coverage and compiled a list of my top five picks.  There are new large room diffuser products appearing on the market (they seem to get bigger all the time) all the time, but at the time of writing, these are the top large diffusers.

This list was last updated September, 2018.

1. URPOWER 500ml Diffuser and Ultrasonic Air Humidifier

URPower 500ml Aromatherapy Essential Oil Diffuser 300pxThis is both a large room essential oil diffuser and a humidifier with the added benefit of an alternating colour night light. The water capacity is a large 500ml allowing up to 10 hours continuous use.  It automatically turns off after choosing from the three time period options, or once the water has run out.

Unlike many other diffusers, the URPOWER interior pops out for easy cleaning and its clearly marked water lines means you’ll avoid an overfill spill. Despite its large capacity and power, the diffuser is amazingly quiet and a great essential oil diffuser for a large room.

Based on sales, reviews and feedback, it has also consistently been the best essential oil diffuser for large space aromatherapy over a few years.

2.  Housmile 600ml Essential Oil Diffuser

Housesmile 3rd Version 600ml Diffuser 300pxThe Housmile not only boasts an impressive water capacity and the ability to purify the air for up to 15 hours, but is one of the most stylish of the large room essential oil diffuser products on the market.

The Housmile adds a subtle ambience with its built-in, warm glow light and its wood-grain exterior. It’s also one of the quietest diffusers which makes it the perfect ‘seen but not heard’ addition to the home.

Its stylishness shouldn’t be mistaken for a lack of substance—the Housmile emits an impressive amount of mist, sure to put at ease any lingering coughs, allergies or tension.

3.  Exqline 1500ml Essential Oil Diffuser


Exqline 1500ml large essential oil diffuserAt a massive 1.5 liters, this large oil diffuser is perfect for the office or home where you want to set and forget for the day (or night). With such a large capacity, it can run continuously for up to 20 hours in low mist mode.

The ability to provide aromatherapy coverage up to 450 sq ft makes this the perfect perfect large room diffuser.  Coverage is helped by the unique 360 degree mist nozzle that rotates to ensure even distribution of mist.

Another great feature is the ability to control the mist output level.  The higher mist level is great for humidifying and the diffuser still runs up to 10 hours. When the water runs out, the unit automatically shuts off.

You can choose from 7 color changing lights at either a bright or dim level to create ambience.

4.  Serene Tranquility 3000ml Diffuser and Cool Mist Humidifier

Serene Tranquility 3000ml Cool Mist HumidifierHUGE!  This is the biggest diffuser on the market.  At 3 liters, it can last up to 40 hours on the lowest mist setting.  You will never have to worry about it running out while you sleep.

This large essential oil diffuser is designed to humidify a large area quickly and efficiently.  This means the essential oils can get to work fast for boosting your health and well being.

Filling the tank for this diffuser is easy – just place it under the tap.  The tank is stable and durable eliminating any concern about breakage or spills.  Plus, your essential oils can be added straight in with no need to worry about corrosion.

With 3 colors to choose from, if you are after a HUGE, whisper quiet diffuser that delivers high humidity, then this is perfect.

5.  Pure Spa XL 2000ml Large Room Diffuser

Pure Spa XL 2000ml large essential oil diffuserUsing its sturdy 2000ml capacity to diffuse essential oils it will cleanse the air and invigorate the senses for up to an impressive 50 hours on the low mist setting (22 hours on high mist). It is an ideal essential oil diffuser for large room areas with coverage of up to 350 sq ft.

Choose one of seven colours to suit your mood or décor, or simply let it roll seamlessly through the rainbow as you drift off to sleep. You can also turn the light or mist off completely if preferred.

Emitting an impressive amount of mist, the Pure Spa XL is easy to refill and clean and its design makes it a great addition to any decor.


The best essential oil diffuser for a large room is one that is easy to clean and refill, looks like it’s part of your decor, has sufficient light and time settings to suit your needs, and of course—efficiently diffuses your favourite essential oils and purifies the air. These larger capacity diffusers produce more mist and a wider reach for the diffusion; perfect for large rooms and open plan spaces.

Each of the diffusers I’ve listed is perfect for bringing the valuable therapeutic qualities of essential oils into your home or office. They’ll help you to wake up, relax, recuperate, repel the cold season, and will make anyone who enters the room feel right at home.



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