What is a flow thru humidifier

The term Flow-Thru refers to water trickling through the water panel and out a drain. The advantages of a flow-thru design is reduced maintenance and no standing water. Scale from calcium and lime gets flushed out of the water panel and down the drain. The water panel is an aluminum mesh with a porous coating that inhibits growth of slime and is easy to change (once a year).

The Flow-Thru is an evaporative humidifier and relies on hot air from your furnace to distribute the humidity. There is little humidity gain if the Flow-Thru humidifier is operating with cold air (and cold water).  While running your furnace blower continuously does have benefits to other aspects of your home, with the Flow-Thru humidifier, hot air is required.