Abstract: A liquid cooler comprising an elongate cylindrical container for holding a liquid to be cooled, and a buoyant cylindrical stainless steel cartridge containing a refrigerant, that is located in the container. The container is open-topped and is closeable via a dome-shaped moulded polyethylene lid having a spout. The container has a surrounding wall comprising an inner wall section of stainless steel having a relatively high thermal conductivity and an outer wall section. The outer wall section comprises a number of layers of material having relatively high thermal insulation properties. The cartridge has an air pocket trapped therein to provide buoyancy therefor which causes the cartridge to rise, in use, within the container. As such, the container and the cartridge define a space between them along which relative flow of liquid occurs when the cartridge rises within the container, thereby enhancing cooling of the liquid.