A desalination apparatus (100) comprises a series of modules (110) which may be mounted on supports (150). Seawater (12) flows through base units (130) along a channel (131) by gravity and is heated by a heating unit (140) such as solar lenses (141) to produce water vapour. A chimney (160) induces an airflow AF laterally across the channel (131) and substantially perpendicularly to the water flow WF. The airflow AF draws the water vapour to a condenser (70) that collects fresh water. The condenser (170) may be mounted within the chimney (160) and may use cold seawater as a coolant.
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