... 3C,CB,CE,ETL approved; 4.need't preheat . Instant Shower Heater ,bathroom shower heater,Bathroom electric shower water heater ... leakage protector; safety thermal cut-out; over-pressure protector; dry-heating protectors.e. Water is completely separated from electricity, ... efficiencyf. Electricity leakage protector, safety thermal cut-off, dry heating protectorg. Thermal Cut-off-prevent Scalding in 55°C ...