Former Royal Naval Hospital Water Tower

The building is a water tower, constructed between 1758 and 1780. It is built of Plymouth limestone rubble with limestone quoins and dressings. The tower has an octagonal plan and a low-pitched roof with a central octagonal turret, leaded dome, and ball finial. The three-story elevations feature blocked oculi (round windows) on the upper floors. A blocked round-arched doorway is present, and a further doorway, with a ledged door, is found on the left-hand return. The interior retains the wooden frame that supported the water tanks. Historically, the tower likely held a lead cistern fed by a chain pump, which pressurised a supply to water closets and throughout the wards. By 1800, an engine house had been added to pump water to the reservoir, representing an early example of a water-borne system of sanitation, and the complex remains remarkably complete. It is a significant component of the Royal Naval Hospital plan and part of an outstanding and uniquely complete military hospital complex. It is among the earliest known water towers in Britain, predating the increased proliferation of such structures in the 19th century for communal water supply. Prior examples included gravity-fed cisterns, with a few mid-17th century examples retaining evidence of water-powered pumping systems.