There are a number of essential oil diffuser options to choose from. Depending on the model chosen, essential oils may be diffused neat, or diluted with water. Most of them have multiple mist settings which allow the user to adjust the amount of output, and/or the amount of area covered when in use. Diffusers that require essential oils to be diluted with water, often have longer operating times associated with them. Choose an essential oil diffuser wisely in order to fully appreciate the warm, inviting experience of using essential oils.