The DeLonghi TRO715 Safeheat 1500W Basic Portable Oil-Filled Radiator maximizes heat flow and minimizes surface temperature with patented thermal slots. The unit is permanently sealed with pure diathermic oil for stable, efficient heating and never needs refilling. Customize your warmth with three heat settings and adjustable thermostat. 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.