1. a closed vessel in which water is heated to make steam for powering turbines, supplying heat, etc. 2. a vessel, as a kettle, for boiling or heating. 3. a tank in which water is heated and stored, as for supplying hot water. [1530–40]
steam engine - external-combustion engine in which heat is used to raise steam which either turns a turbine or forces a piston to move up and down in a cylinder steam whistle - a whistle in which the sound is produced by steam; usually attached to a steam boiler vessel - an object used as a container (especially for liquids)
a closed vessel or arrangement of vessels and tubes, together with a furnace or other heat source, in which steam or other vapor is generated from water to drive turbines or engines, supply heat, process certain materials, etc.Compare fire-tube boiler, water-tube boiler. a vessel, as a kettle, for boiling or heating.
A steam boiler is a power generation device, used for generating steam by applying the heat energy to water. The pressure range of earlier boilers ranges from low pressure to medium pressure (7 kPa to 2000 kPa/ 1psi to 290 psi). The present boilers are more useful because it works with high pressure than old ones.
A steam boiler is a container in which water is heated to produce steam. The steam boiler has a longer on-off cycle because steam has to be produced each time there is a call for heat. Steam turbines generally require high-pressure steam boilers, so you have the maintenance of the boiler system as well as their turbine to consider.