Whether in self-service applications like buffets or back-of-house, a hot bar is a great way to keep food warm until serving. Food pans are placed over water pans heated from below by a burner. That creates steam, which provides quick and even heat transfer to the food above. Gas and electric models are offered, as are a wide variety of sizes. Many electric models have casters for mobility, making them a good choice for caterers. Most models have either a stainless steel or laminated vinyl exterior.