3. OPERATION Power switch Press the On/Off switch to activate the heater on maximum (1500 W) power. Press again to shut off the heat. 4. FOR YOUR SAFETY IMPORTANT INSTRUCTIONS 1. ONLY USE THE UNIT ON A SOLID SURFACE. 2. This heater is not intended for use in bathrooms, laundry areas or similar indoor locations where there may be moisture. Never place heater where it may fall into a pool, bathtub or other water receptacle. 3. This unit is intended for household use only.