There are several reasons to opt for a filterless humidifier over a filtered one, like minimizing costs down the line. While almost all filterless units use ultrasonic technology to diffuse moisture into the air, the best filterless humidifiers set themselves apart by being easy to clean and maintain despite the lack of a filter.
Since filters are designed to remove both dust and hard-water buildup, when opting for a filterless unit instead, you'll want to find one that's easy to clean. This often includes a wide opening, a removable tank, a lightweight design, or a handle for hassle-free transfer to the sink. While it's usually recommended that you use filtered water rather than tap, these features will help you to clean out any residue that might be left behind. (Some high-end options also offer removable sponges to further absorb dust and minerals.)
Aside from those qualities, shopping for a filterless unit is a lot like shopping for any other kind of humidifier: Consider the footprint, tank capacity, run time, and extra features to ensure that your purchase is ideal for the intended space. Here are four of the best humidifiers on the market, and all of them skip the filter altogether.
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