Which of the freshwater generators listed below is operated without a source of heat?

Correct Answer: Option C — Reverse-osmosis type

Reverse-osmosis units utilize high-pressure pumps to force water through semi-permeable membranes, relying on mechanical energy rather than thermal energy. Unlike flash or submerged tube evaporators, which require heat to change the phase of water, RO systems operate at ambient temperatures, making them highly efficient for shipboard freshwater production.