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An ultrasonic diffuser mixes a few drops of oil with water and makes a cool mist. A nebulizing diffuser uses no water and gives a stronger scent. Reed and heat diffusers are the quiet, simple options.
Types of diffusers
| Type | How it works | Scent strength | Upkeep | Find it |
|---|---|---|---|---|
| Ultrasonic | Vibrations turn water and oil into mist | Mild to medium | Rinse and wipe often | Amazon |
| Nebulizing (waterless) | Air pressure atomizes pure oil | Strong | Uses more oil, clean with alcohol | Amazon |
| Reed diffuser | Reeds draw scented oil up from a bottle | Mild, constant | Flip reeds now and then | Amazon |
| Heat or candle warmer | Gentle heat evaporates oil | Mild | Wipe the dish | Etsy |
| Passive stone | Drops on porous ceramic or lava stone | Very mild, close range | None | Etsy |
Waterless nebulizing models have become much more common in recent years, so you will see many of them when you shop.
What to check
- Room size the maker states.
- Timer and auto shut-off.
- Noise level if it is for a bedroom.
- Easy cleaning: a wide opening you can wipe.
Essential oils are concentrated. Keep them away from children and pets, never swallow them and ventilate the room. Some oils are harmful to cats and dogs, so ask a vet if you have pets.