Our 18 Qt. rectangular stone heater is designed for full body massages where a full stone set is required for full body massages. The stainless steel body professionally matches the stainless lid. The lid features a silicone handle for quick removal. The removable water reservoir is made with Porcelain coating for easy clean-up. The temperature dial is simple to read and use and has a pre-heat setting for fast heat-up. . It is built to commercial standards, is UL listed and features a grounded three prong plug. It comes with a one year warranty.