Stepper Water Heating Technology. Power-off memory, program remains unaffected, fault prevention alarm, adjustable heating temperature. Modularized six-sided full insulation, steam exhausted from bottom, more energy-efficient and cleaner Intelligent control, no water output without boiling, 100% safe drinking water SUS 304 Stainless Steel Water Tank, SUS 316-800L Stainless Steel Heating Tube, higher efficiency; Water quality undergoes multiple filtration and purification, safe water quality and refreshing water.