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How much water does a humidifier use?
Depending on the model you choose and the size of your home, a humidifier uses from 1.5 to 12 gallons per day when the furnace is operating. This minimal amount of water is enough to raise the humidity to your desired level, but not enough for you to notice a difference on your water bill. Lennox' steam humidifier is so efficient, it uses nearly all the water it takes in.