The Coil – A coil (or atomiser) consists simply of a heater coil, which is wound around a high temperature capillary wick. The wick, dependent upon the type of atomiser, will be connected to the source of fluid (tank) to provide a continuously ‘wetted wick’. When power is applied to the coil and air is drawn across the wick wound coil, the fluid-soaked wick is heated, providing atomised heated vapour to the user.