"The right diffuser doesn't just fill a room with scent — it changes the feeling of being in it."
If you've never owned a diffuser, or if the one you have sits gathering dust because it's fiddly or the scent isn't right — this is for you.
There are three main types, and they work quite differently. Here's how to choose the one that fits your life.
Ultrasonic diffusers — the everyday workhorse
This is what most people mean when they say "diffuser." An ultrasonic diffuser uses water and ultrasonic vibrations to create a fine mist of water and essential oil. They run for 4–10 hours, depending on the size, and they're gentle enough to leave on while you sleep.
Best for: Bedrooms, living rooms, any space where you want continuous, ambient scent. Ideal if you're new to diffusing.
What to look for: A tank of at least 200ml (the bigger the tank, the longer it runs). A warm LED option rather than colour-cycling lights. A quiet motor — you should barely know it's on.
Glass diffusers — for people who care about aesthetics
A glass diffuser uses a small amount of oil directly — no water required. The result is a purer, more intense scent. It also tends to look significantly better on a shelf.
Best for: Smaller spaces (offices, reading nooks, bathrooms) or anyone who wants the diffuser to be part of the decor as much as the function.
What to look for: Handblown or hand-shaped glass. A minimal, considered design. Check the oil capacity — some are very small and need refilling daily.
Reed diffusers — set and forget
No electricity. No water. No timer to set. Reed diffusers work passively — natural rattan reeds absorb the oil and release the scent slowly, continuously, over weeks.
Best for: Entranceways, bathrooms, any space where you want a constant, subtle base note of scent. Also the most gifting-friendly option.
What to look for: A 100ml bottle will last 6–8 weeks. Flip the reeds once a week to refresh the intensity. Store away from direct sunlight — it degrades the oil.
Which oils to start with
If you're new to aromatherapy, start with three:
- Eucalyptus — cool, clarifying, clean. For mornings and workspaces.
- Lavender — calming, familiar, soft. For evenings and sleep.
- Sandalwood or cedarwood — warm, grounding, earthy. For living rooms and slow afternoons.
These three will cover most moods and most rooms. Everything else is exploration.
Earthy calm for your home. — SPADRIFT