Water engine : An engine to raise water; or an engine moved by water; also, an engine or machine for extinguishing fires; a fire engine.

Example:


Taxonomy
hydrogen, Brown's gas, oxygen, fuel, Rothman, fuel cells, using water, oxygen content, metal alloy, atmosphere, car, hydrogen gas, Automobile, company, electrolysis unit, Drunvalo, gasoline engine, invention.

Defination from the web:
engine running on water (click on pictures for larger versions) ... In any case, the type of electrolyte used is not important to the overall "proof of concept" that water can be broken down to run a combustion engine. ...