VEVOR Electric Hot Box Food Warmer, 4-Tier Commercial Warming Cabinet with Water Tray, Glass Door and Adjustable Shelves, Stainless Steel Food Warmer Cabinet, for Restaurant, Kitchen, Pizza, Chicken

Yes, this VEVOR food warmer is equipped with a standard 3-prong (grounded) power plug.

Dear customer, Preheating: Yes, you must preheat this food warmer. Set it to 165°F and preheat for about 20 minutes before use. Reheat time: After preheating, a chilled food pan (37°F → 165°F) normally takes 25–40 minutes. The exact time depends on pan size, food amount, and usage conditions. If you have further questions, feel free to let me know.