The 4000 is so compact and versatile that it is widely used, with excellent results, by people around the world. Just like them, you can have a supply of fresh, homemade distilled water no matter where you are. Simply fill the stainless steel boiler with tap water, press the start button, and soon you'll be enjoying the most deliciously pure and refreshing water you've ever had! NO assembly, installation or hookups necessary As with all Waterwise distillers, the 4000 combines steam distillation with carbon post filtration, resulting in optimum water purity. Automatic shutoff after each 1-gallon cycle. Provides 6 gallons per day.