If you need to hold hot food for more than 4 hours or if you need to frequently access food to replenish your chafing dishes, then our H-Series (Heated-Series) carriers and carts are exactly what you need. We have gone a step beyond our original insulated carriers and carts (as if they haven't already been doing a fantastic job as is) and added energy-efficient heaters to the doors.Food stays hot and safe for as long as needed and resets to safe temps within 3 minutes. Stays cool to touch even when plugged in. Uses less energy than 3 standard 100 watt light bulbs.