23 inch electric fireplace insert heater with log set & realistic flame, overheating protection W1769P255456CSA UL certification ensures long time services and user's safety Double safety protection device, one is overheat protection device, automatically cut off when thetemperature is too high, the other one is fuse. 1400W heat 5000 BTU's per hour provides supplemental heat up to 400 Sq. ft. 11 temperature settings : 64F 82F,ON meas heater keep working; Timing function can set the time from 1 to 8 Hours 50000 Hours life time LED light source; Realistic