Which Ultrasonic Oil Diffuser Is The Best Choice For You?

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Last Updated on October 28, 2020 by Lynn

Diffusers are one of the best ways to make use of the therapeutic value of essential oils. The AromaFuse diffuser and the Aroma-Spa diffuser are both ultrasonic aroma diffusers. I have discussed the different kinds of essential oil diffusers in a previous post. Read it HERE. The ultrasonic diffusers do not use heat, which destroys the molecules of the oils. Instead, they use water that is broken up into a mist by an ultrasonic vibrating disc. These types of diffusers are the most popular and the price is fairly reasonable. So let’s take a look and compare these two ultrasonic diffusers – The AromaFuse by Plant Therapy and The Aroma-Spa by Diffuser World.

How To Use Them

Both of these diffusers are used basically the same way:

1. Remove the cover.
2. Add water in the reservoir to the water mark.
3. Add drops of oil, depending on preference of strength.
4. Replace the cover.
5. Connect the power cord.
6. Press power button and choose desired setting.ultrasonic aroma diffusers

Description and Features

Both of these diffusers are similar in shape and size, with the AromaFuse being about an inch taller and just a little wider at 6.8″ wide by 4.3″ tall. The Aroma-Spa measures 6.5″ wide by 3″ tall and has very short legs and sits almost flat on a surface, whereas the AromaFuse has longer angled legs that lift it up about an inch off the surface.

They both have timer settings and light settings, which are great features. This is where the products differ somewhat. One covers over 500 sq. feet, while the other one covers over 300 sq feet.


This diffuser has 5 timer settings.

  • Press once for continuous until it runs out of water, approximately 6-10 hours.
  • Press twice to run for 2 hours and turns off automatically
  • Press three times to diffuse at 15 sec on/30 sec off until water runs out.
  • Press four times to diffuse at 15 min on/30 min off until water runs out.
  • Press five times to diffuse at 30 min on/30 min off until water runs out.

This diffuser also has a Light setting. When the diffuser starts, the LED light comes on. Press the button once to dim the light. Press the button twice to turn the light off.

The AromaFuse has a large 380 ml water reservoir that can give up to 10 hours of continuous diffusion. It covers an area of more than 500 square feet.


This diffuser only has three timer settings.

  • Press once for a continuous mist that lasts up to 3 hours and shuts off automatically.
  • Press twice to diffuse at 15 sec on / 15 sec off for up to 6 hours, shutting off automatically when water is gone.
  • Press three times to shut off.

There is also a light setting on the Aroma-Spa.

  • Press once to turn lights on and the light changes colors.
  • Press twice to choose a color and leave on.
  • Press three times to turn the light off

The Aroma-Spa has a 100 ml water reservoir that can give approximately 3-4 continuous hours. This diffuser covers approximately 300-400 square feet.

Why Buy Either Of These?

Essential oils have so many therapeutic properties that are beneficial to all of us. They can be used for many conditions. Anything from anxiety and depression to respiratory conditions, such as, sinus, colds, and asthma. They can be used to treat pain, for wrinkles, scars and wounds. Oils can also be great air fresheners, too.

The Aroma-Spa and AromaFuse can be used along with essential oils to help relieve a lot of these conditions. When the molecules of the oils are misted into the air, they are inhaled to help give relief.

Which One Is My Choice?

Each one of these diffusers does what they are supposed to do, in diffusing the essential oils into the air. Which one is better? Personally, I like Plant Therapy’s AromaFuse better, mostly for the fact that there are more choices of how long the diffuser can run. I like to have mine run all day, so having it 30 minutes on and 30 minutes off is perfect.  Plus, I think the style is nice with the angled legs.

Lights are not why I buy a diffuser. I like the AromaFuse diffuser because there is only one light option, either on or off, and it’s dimmable. Most of the time, I leave the light off on my diffuser. I just use it for the benefit of the oils. This diffuser has a one-year limited warranty, which is great! Aroma-Spa_Black

The Aroma-Spa only has the 15 seconds on, 15 seconds off timer setting, which will only last maybe 6 hours. It does have a smaller water reservoir, so, of course, it can’t run as long as the AromaFuse. This is still a nice diffuser, though, and does the job, and is good for a small room.

If you like lights on your diffuser, this one is great for that. It has multi-colored lights, including blue, purple, green, yellow, and red. There is a setting to rotate through each color or a setting to chose a color to stay on. This diffuser has a six-month warranty.

Where Can These Be Purchased?

The AromaFuse is sold by Plant Therapy and the purchase price is $54.95.  It comes in Rose Gold or Wood-Grain Brown.   Purchase the AromaFuse HERE.  The Aroma-Spa is sold by Diffuser World and is on sale for $29, original price being $59.98. This comes in either black or white.  Purchase the Aroma-Spa E.  Both of these are great buys for what you are getting, especially with the Aroma-Spa on sale.

My Final Opinion

Between these two ultrasonic aroma diffusers, my personal choice is the AromaFuse diffuser because it has several timer settings, and because of the one-year warranty. The ratings on this diffuser are pretty good, with an average of 4.5 stars on with 564 reviews and has 4 stars on with 83 reviews.

The Aroma-Spa diffuser may be cheaper right now, but at the original price, I don’t think it’s worth if for me.  $29 is a much better price for this one.  It may work good, but it doesn’t have all the features that I like.  The ratings are good for this one with 5 stars for 2 reviews on Amazon and 5 stars for 2 reviews on Diffuser World.

Diffusers are great to help keep you healthy and to improve your life.  If you are using a diffuser, that’s awesome!  If you are looking to buy one, I hope my review comparison on the AromaFuse Vs. Aroma-Spa has given you some information to help you in your decision.

As always, thanks for reading!



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8 thoughts on “Which Ultrasonic Oil Diffuser Is The Best Choice For You?

  1. Thanks for sharing this article. I am not a direct user myself but my girlfriend is hooked on the oils and we have a diffuser in every bathroom and in the bedroom. Coming to bed at night with the diffusor running is really nice. With some tranquillizing meditation music in the background and the mobile phones in another room, the setting is perfect for sleeping.

    1. Lars,
      Sounds like your girlfriend has the right idea. My bet she is using lavender essential oil in the diffuser. Lavender is an awesome oil. It just puts you in that relaxation mode. That’s what we use to help us sleep. It’s great that you are getting the benefits of your girlfriend using essential oils. Thanks for sharing!!!

  2. I enjoyed reading your post about these diffusers. I use one that I purchased from Young Living Oils where I have a friend who sells oils. I love the diffuser, but I really don’t know how it works, except that it puts a mist up in the air! I like the sounds of the diffusers you mentioned and they seem to have a lot more versatility in that they will run for hours instead of an hour…
    Thank you!

    1. Karin,
      I’m glad to hear you use a diffuser already. It sounds like you have an ultrasonic with a disc that vibrates, shaking up the oil molecules. It’s really interesting how it works. These diffusers have the choice of running just a short amount of time or longer. How long does yours run? Just an hour?

      That’s the thing I like the most about these, especially the AromaFuse. They can run all day. You just need to make sure the right amount of essential oils are put in. I typically use from 10-12 drops for all day. Thanks for reading!

  3. I absolutely love aromatherapy essential oils as I know how great they are for healing all sorts of conditions. I work in a Herbal Apothecary and we have a huge selection of essential oils and also we have a a diffuser on the go all the time. This means I get to try and test all the oils and have come to realise their power. If I feel tired I put something zingy in like lemon or grapefruit and it works like a charm to wake me up.

    I love the diffusers in your post as they not only do the great job of diffusing healing oils into the air but they also look stylish and pretty. It’s reminded me that I really want to purchase one for my own home; something that I have wanted to do for a while.

    1. Stefanie,
      That sounds like a really awesome place to work. I am into the natural ways of healing. We use herbs and, of course, use a lot of essential oils. So you have discovered the power of essential oils. I love it. For sure lemon and grapefruit give you that pick me up. They have so many other great benefits, too. Check out my posts about lemon essential oil and grapefruit essential oil.

      I’m really surprised you don’t have a diffuser for home use, then you would get those awesome benefits all day long and even when you’re not working. Let me know if you end up getting one and what kind!

  4. Great article on diffusors…..Got a question? I have really bad allergies and sinus issues. What would recommend to use? Does what you promote address these types of issues? Please get back to me….thanks

    1. Terry,
      I’ll answer you with a bit of history. My husband, Perrie, has been suffering with allergies for years and we were spending so much money on OTC meds. He discovered essential oils about 4 years ago to see if they could help him. Within the first year of using essential oils, he no longer had to take those OTC meds and we are saving money, because you use such a small amount of oils.

      We use eucalyptus and peppermint essential oils in the diffuser. Here’s my post on peppermint oil and here is my eucalyptus oil post. These will give you more information about these oils. How much you use depends on the size of the diffuser.

      Along with the diffuser, we both use personal inhalers that have eucalyptus oil and peppermint oil in them. They are portable, so you can take them anywhere. You can buy the inhalers and add the oils to them. Here is where you can get the inhalers. They come in different colors. Also, here is a link to our inhaler recipe that we use.

      I hope this helps you. We just know by experience that it has helped us. I have sinus problems and both of these help to relieve the condition. Please, if you have anymore questions feel free to send me an email or comment.


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