Editing Humidifier (section)

=== Disc wheels ===
A disc wheel style (bypass) is very similar in design to the drum style humidifiers; this type of furnace humidifier replaces the foam drumming with a number of plastic discs with small grooves on both sides. This allows for a very large evaporative surface area, without requiring a great deal of space. Unlike the drum style humidifiers, the disc wheel does not need regular replacement.

:Advantages include:
:* Very low maintenance (basin of humidifier should be cleaned out periodically, unless an automatic flushing device is installed)
:* No regular replacement of parts necessary
:* Higher output due to large evaporative surface area
:* Can be installed in hard water situations
:* Maintains efficiency throughout lifespans

:Disadvantages include:
:* Higher price
:* Water evaporation even when humidification is not required (due to the pan of water which remains exposed to a high velocity air stream)