When you dispense water from your Quooker tap, you use the exact amount of water you need. Unlike with a kettle, whereby people often boil more water than needed...or decide to re-boil it because the water has cooled down, wasting lots of energy!
Quooker's patented vaccum tank allows for water to be kept at 110 degrees under pressure. This technology keeps the water hot without needing to use much energy. Think of it as an electrically powered flask, from which no energy can escape. The water only boils when it exits the tap - so it is not constantly boiling inside the vessel.