A fan draws air into the unit and through a wicking filter. When the air exits through the top, it is clean and moisture filled. A vaporizer is similar to a humidifier in that it adds water to the air. However, the water is first boiled into steam and then discharged into the room. That depends on whom you talk to.
Many people prefer to have the large, standing floor models because of their convenience.
They simply fill them up every few days and are rewarded with a home that is kept at the proper humidity level. Others like to place the ultrasonic units in their bedrooms because of their extremely quiet operation. Still, some people claim that the vaporizer is the most advantageous, because it boils the water before sending it into the air, harmful bacteria are killed and are less likely to cause a problem. Also, a warm-mist vaporizer serves as a heat source in the bedroom, since condensing steam releases heat. Mainly there are two.