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How diffusers make steam even without heat explained


A simple electronic mechanism produces the steam that comes out of your diffuser; I have two essential oil diffusers at home and have investigated the process that produces the steam.

How do diffusers make immediate steam without heat? No heat is used in the production of steam in a diffuser; instead, ultrasonic vibration is used. The vibrating plate generates ultrasonic waves around 2000 per seconds inside your diffusers then this create small oil particles that are subsequently dispersed into the air as steam.

Let’s get into more details.

How do steam diffusers actually work?

I intended to open up one of my diffusers, and I may do it next time, but I found a pretty excellent explanation on YouTube that also illustrates what’s inside our diffusers and how steam diffusers function.

I’ll explain the basic diffuser’s parts below.

Diffuser Motherboard

diffuser motherboard

The motherboard is the electronic component that controls your diffuser; it is where all of the signals and functions of a button are transferred and sent to your diffuser.

Ultrasonic Plate

diffuser ultrasonic plate

The ultrasonic plate is in charge of producing vapor and steam; it vibrates or moves the plates in a matter of seconds, allowing for the creation of cold concentrated steam. It has no effect on the oil’s quality and the method is very effective.

Diffuser Fan

diffuser fan

The fan is in charge of blowing the necessary cold vapor or steam from the interior of the diffuser to the exterior of the device.

Diffuser Reservoir

diffuser reservoir

The water and essential oil are mixed inside the reservoir, which is also full of static fog that is waiting for the air pressure to transfer it from the outside of the diffuser.

Watch the video above

These are the basic diffuser components that contribute to the production of steam from your diffuser. So that’s how a nebulizing diffuser or a steam diffuser works!

You may also want to read: Can oil diffusers work as a humidifier?

In the following section will go over your diffusers’ buttons or control panels.

How to use steam diffuser control panel?

Your diffuser contains buttons that send a signal to the motherboard of your diffuser, which interprets the signal and then sends the appropriate action to your diffuser.

The basic components of your diffuser control panel are as follows:

Above is a photo of my Asakuki diffuser’s control panel
  1. Light
  2. High/Low
  3. Mist
  4. On
  5. 60/120/180


  1. Light, when switched on will change the color of the LED lights of your diffuser
  2. High/Low, when press will change the orientation of your diffuser’s steam, either high or low
  3. Mist, when press will toggle between numbers 4 and 5, but when press and hold it will shut off your diffuser
  4. On, when the LED light is in this selection, it means the mist is continuous
  5. 60/120/180, when the LED light is in one of these positions, it means the timer is set to 60, 120, or 180 minutes. When the timer reaches this duration, it will automatically shut off.

Why is diffuser steam cold?

How does oil diffusers make cold steam? Because the diffuser does not use heat to generate steam, the mist created by ultrasonic vibration is cold steam. When you put warm water in your diffuser, it cools down to the point where the diffuser produces cold mist.

Note: You should never put hot water in your diffuser; otherwise, it will cause major damage to your diffuser.

How to choose your oil diffuser?

Can you choose any diffusers with any essential oils? The proper method of selecting an oil diffuser is to first measure the size of your room, and then determine the suitable size of oil diffuser to purchase based on the size of the room.

All you have to do is measure the length and width of your room to get its area.

Here is an example of our room area;

Let’s say my room’s length is 4meters and the width is 5meters, you just then multiply both of them to get the area in square meters.

A= LxW

A= 4×5

A= 20 square meters.

I can utilize a 200 mL oil diffuser capacity that suits a modest bedroom for that size. You can also read the description of the diffuser before purchasing it, and the ideal option is to ask the manufacturer to get the perfect sized diffuser for your room.

Note: Also, keep in mind that this sort of oil diffuser is designed for home use only, not commercial use.

Why sometimes diffuser does not generate steam?

How long does it take for an oil diffuser to work? The majority of diffusers work instantly, which means that the steam will begin very immediately. This is true for both of my essential oil diffusers. When you turn it on, you can immediately smell the aroma of your essential oil.

The issue of a diffuser not producing steam might be caused by one of four factors:

  1. Water level is low or empty – If the water level in your diffuser is either empty or below the acceptable level, simply add more water and switch it on to see if it works.
  2. Diffuser fan is not connected properly – Remove the bottom screws from your diffuser and connect the wires to your diffuser fan. Check if the fan works before reassembling it.
  3. Ultrasonic plate is dirty – Examine your ultrasonic plate for dirt in the gaps, clean it thoroughly, and then inspect it before reassembling it.
  4. Diffuser is dirty – Gently clean and dry your diffuser before turning it on. When cleaning your diffuser, ensure sure the plug is unplugged.

Note: Make sure your diffuser isn’t connected to your power outlet before you open it; always double-check to avoid any mishaps.

Are steam diffusers safe as a facial steamer?

Can you use the oil diffuser as a facial steamer? The oil diffuser is not intended to be used as a facial steamer because it actively disperses the oil into the air. Inhaling straight from the diffuser can get the oils into your eyes and lungs, which can cause irritation.

If you wish to utilize oils as a face steamer or safely inhale them, experts recommend three methods.

The first and simplest option is to use an aromatherapy inhaler to safely employ oils as inhalers.

Second, if you want to use your oil as a facial steamer, heat up some water that isn’t too hot, add a couple drops of oil to the water, and let the steam hit you that way.

Third, when inhaling essential oils, you can use a cotton ball or a tissue to do passive diffusion, which prevents the essential oils from being aggressively disseminated into your lungs and eyes. Passive diffusion is far safer than direct inhaling.

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