Comfort Glow BDISC6 Original Brown Box Ceramic Disc Heater 5,200 BTUs Nullify Imported 4 ceramic disc heating elements Sturdy steel "brown box" housing Electronic thermostat External ambient temperature sensor Accidental tip-over shut-off 4 ceramic disc heating elements - fan continues to run in cool down mode Electronic thermostat with External ambient temperature sensor Accidental tip-over shut-off Heating Area: up to 600 sq ft Sturdy steel "brown box" housing