The DeLonghi EW6507W Safeheat 1500W Portable Oil-Filled Radiator uses up to 36% less wattage than conventional models due to its unique design and advanced technology. The unit is permanently sealed with pure diathermic oil for stable, efficient heating and never needs refilling. Patented thermal slots are specially designed to maximize heat flow yet maintain a low surface temperature. Three heat settings and adustable, room-monitoring thermostat automatically maintains your desired room temperature. The heater automatically turns on when the room temperature drops below 44 degrees F with anti-freeze setting. If the heater becomes too warm, it automatically turns off with safety thermal cut-off. The rust-resistant, durable, metal construction has no exposed elements and the gently rounded design means no sharp edges. Patented, premounted, smart-snap wheels ensure portability, safety and stability. Plus, wrap around cord storage lets you store cord when heater is not in use.