An ultrasonic atomiser normally uses a tank of water with a small amount of suitable essential oil to produce a cool mist. A waterless nebuliser atomises the oil directly, so it must be set up and maintained according to its own instructions.

No. Many models are water-based, while the dry or waterless nebulisers are specifically designed to operate without water. Check the individual product title, specification and user instructions before filling it.

A compact everyday atomiser, one design-led model and one strongly visual showpiece give a new stockist a useful spread without creating a crowded display. Add specialist waterless models when staff are comfortable explaining the difference.

Do not assume so. Several models are specifically described for use with essential oils, and oil compatibility can vary by mechanism. Recommend only the liquids stated in the individual product instructions.