• Vaporizer: Warm Mist humidifier. Typically low output units with very basic features.
  • Warm Mist Humidifier: A more "sophisticated" version of a vaporizer. A warm mist humidifier uses a different type of heating element than a vaporizer and typically has a removable tank. Some warm mist humidifiers are available with water purification filters that make the unit easier to clean.
  • Impeller: A cool mist humidifier that uses centrifugal force to create moisture. These are usually low output units with very basic features.
  • Evaporative Wick Humidifier: Cool mist humidifier that uses a wick filter to produce moisture.
  • Console humidifier: These are the same as evaporative wick humidifiers but are much larger in size.
  • Ultrasonic Humidifier: Frequently referred to as "visible mist" humidifiers, ultrasonics produce cool moisture by creating vibrations in the water that break the water into moist vapor.