Editing Steam engine (section)

=== Water pump ===
Most steam boilers have a means to supply water whilst at pressure, so that they may be run continuously. Utility and industrial boilers commonly use multi-stage [[centrifugal pump]]s; however, other types are used. Another means of supplying lower-pressure (typically about 5 to 10 atmospheres pressure) boiler feed water is an [[injector]], which uses a steam jet usually supplied from the boiler. Injectors became popular in the 1850s but are no longer widely used, except in applications such as steam locomotives.{{sfn|Hunter|1985|pp=341–43}} It is the pressurization of the water that circulates through the steam boiler that allows the water to be raised to temperatures well above {{convert|100|C}} boiling point of water at one atmospheric pressure, and by that means to increase the efficiency of the steam cycle.