A refrigerator having: a) cooling means; b) a payload container (22, 122), a payload space located within a payload container (22, 122) and within which items can be placed for temperature-controlled storage; and c) a casing (10, 110) constructed to be a reservoir (12, 112) within which water is contained in use, insulating material being carried on outer surfaces of the casing (10, 110) and the reservoir (12, 112) having: i) a cooling region in thermal communication with the payload container (22, 122), the payload container (22, 122) having one open face that opens to the exterior of the casing (10, 110), the other faces being located within the casing (10, 110) and except one of them being submerged, in use, under the water contained within the casing (10, 110), the submerged faces having no insulation so that they are in thermal communication with the surrounding water in the cooling region of the reservoir (12, 112); and ii) a headspace, characterized in that all said other faces are submerged and belong to said submerged faces, and in that said headspace, in use, contains water and is disposed above the payload container (22, 122) and the cooling region and is in fluid communication therewith, the headspace being configured to permit said cooling means (32, 132; 66, 166) to be disposed therein for cooling water within the headspace. a) cooling means; b) a payload container (22, 122), a payload space located within a payload container (22, 122) and within which items can be placed for temperature-controlled storage; and c) a casing (10, 110) constructed to be a reservoir (12, 112) within which water is contained in use, insulating material being carried on outer surfaces of the casing (10, 110) and the reservoir (12, 112) having: i) a cooling region in thermal communication with the payload container (22, 122), the payload container (22, 122) having one open face that opens to the exterior of the casing (10, 110), the other faces being located within the casing (10, 110) and except one of them being submerged, in use, under the water contained within the casing (10, 110), the submerged faces having no insulation so that they are in thermal communication with the surrounding water in the cooling region of the reservoir (12, 112); and ii) a headspace, characterized in that all said other faces are submerged and belong to said submerged faces, and in that said headspace, in use, contains water and is disposed above the payload container (22, 122) and the cooling region and is in fluid communication therewith, the headspace being configured to permit said cooling means (32, 132; 66, 166) to be disposed therein for cooling water within the headspace. i) a cooling region in thermal communication with the payload container (22, 122), the payload container (22, 122) having one open face that opens to the exterior of the casing (10, 110), the other faces being located within the casing (10, 110) and except one of them being submerged, in use, under the water contained within the casing (10, 110), the submerged faces having no insulation so that they are in thermal communication with the surrounding water in the cooling region of the reservoir (12, 112); and ii) a headspace, characterized in that all said other faces are submerged and belong to said submerged faces, and in that said headspace, in use, contains water and is disposed above the payload container (22, 122) and the cooling region and is in fluid communication therewith, the headspace being configured to permit said cooling means (32, 132; 66, 166) to be disposed therein for cooling water within the headspace.