An electric water boiler, also called a thermo pot or tea urn[1] in British English, is a consumer electronics small appliance used for boiling water[2][3] and maintaining it at a constant temperature in an enclosed reservoir. It is typically used to provide an immediate source of hot water for making tea,[2] hot chocolate, coffee,[2] instant noodles, or baby formula, or for any other household use where clean hot water is required. They are a common component of Japanese kitchens and the kitchens of many East Asian countries but are found in varying use globally. Smaller units are portable. Some thermo pots are designed with a feature that can purify water.[4]