28 inches. According to the information on the inquiry website, the enamel rice cooker is a kind of cooker made of iron, steel, copper or aluminum, and its surface is covered with a special enamel coating. The biggest pot is 28 inches. Enamel rice cooker is a perfect combination of natural cast iron and high-grade enamel, which can prevent metal from rusting, resist the corrosion of various liquids and have good acid and alkali resistance.