Editing Humidifier (section)

==== Tanks ====
The water is usually supplied by manually filling the unit on a periodic basis.

Top fill: A top fill tank has a hole at the top to make it convenient to refill the tank on daily basis.

Bottom fill: Bottom filled humidifiers has removable water tank, often attached with a replaceable demineralization filter. Both the cap and the filter are often universal, which means that they can be switched between many tank cap humidifiers.
[[File:دستگاه_بخور_سرد.jpg|thumb|An ultrasonic humidifier with a bottom filled tank that has a replaceable demineralization unit (see inside bottom)]]

Tank cap-based humidifiers are more inconvenient to fill than top fill tanks, because the demineralization filter has to be unscrewed and screwed back on a daily basis. Also, water drops from the tank attachment may get in contact with the hygrometer, which will make it harder to operate properly if they are not operated with caution.