Apparatus for the exchange of substances and heat for use in the production of steam, for use in cooking and for use in refrigeration; Drain structures for use in spas, steam rooms and baths; Hydrogen-generation equipment and components, namely, hydrogen generators, hydrogen purifiers, hydrogen purification membranes, fuel processors, and steam reformers; Ironing tables that generate steam for ironing; Sanitary installations in the nature of steam rooms; Steam accumulators; Steam generating installations; Steam generators; Steam heating apparatus; Steam radiators for heating buildings; Steam superheaters; Steam tables for food serving and keeping; Steam valves