The requirements for the design and operation of equipment for large-size W-Condenser units for the production of natural fresh water of rainwater quality from atmospheric maritime moist air in large volumes are considered. The principles of choice of structural materials are recommended, which ensure high corrosion resistance and serviceability of water-to-air heat exchangers during long-term operation. Technical requirements for materials of equipment and pipe systems are formulated with the purpose of working out a unified technological cycle for the production of clean water, which ensures the productivity and resource of the condenser unit. The most promising construction materials for the manufacture of environmentally friendly heat exchange equipment and capacitors for W-Condenser blocks produced by natural fresh water from atmospheric moist air in the seas and oceans are substantiated.