1.Only 3 seconds for hot water.no preheating,no wait. 2.Thermostatic 3 ... heating element 1.Key Features:1) On demand hot water in just 3 seconds. No preheating, no wait.2 ... ) National patent heating technology. Water is completely seperated from electricity.3) Over 3 meters ... water flow, no scale incrustation, long lifespan.4) ...