An apparatus, usually fuel-burning, electric or solar-powered, in which water is heated to be used directly as domestic hot water or process hot water (but not for supplying space heating, calorifiers etc, for which a boiler or furnace is used).

(literally) A mark, such as a line of seaweed, showing the highest level reached by a body of water.

Hot water for use in industrial processes.

Water used, in any type of building, for domestic purposes, principally drinking, food preparation, sanitation and personal hygiene (but not including space heating, swimming pool heating, or processes such as commercial food preparation or clothes washing).

A flexible, saclike bottle, usually made of rubber, intended to be filled with hot water and placed on some part of the body for thermotherapy, or simple warming.

An informal sport in which participants use tyre inner tubes as rafts and ride them on rivers through caves

A species of vole, Arvicola amphibius, formerly Arvicola terrestris.

plural of European water vole

(US, slang) Alternative form of long drink of water (“a tall person”).

(idiomatic) Highly adverse circumstances; acts of God.