How to Use: 1. Fill container with water, immerse the heating element into water and then power on. 2. Pull the power supply after the water is boil, but don't bring out the heater from the water immediately, should wait for 20 seconds. Note: 1. Do not put your hands into water container when the item is working. 2. Do not run water container dry with the item. 3. Strictly forbid to take a shower directly in the process of heating.