The subject of this paper is usage of steam generators on exhaust gases which are currently used on most merchant ships. The paper was written in order to explain components of steam generators on exhaust gases, the basics of operation of steam generators on exhaust gases, their maintenance and management. The performance of steam generators on axhaust gases can be varied. Ship steam generators are intended for the production of steam which serves as a drive for auxiliary engine and devices and for various ship services. The steam production capacity depends on the purpose of the steam generators must satisfy on ship. Ship steam generator dates since 1807, respectively when water was first time used for ship opeartion on ship „Clermont“. Steam generators on exhaust gases are located on the highest engine room level, above the main engine, so that the gases with a higher temperature would enter in the steam generator. Materials used for the construction of steam generators on exhaust gases and especially parts under pressure, must have the appropriate attestations of quality and succesful prescribed examinations.