Steam injectors are fitted to heat liquid substances through direct injection of hot steam. Direct heat transfer is often the quickest and most efficient way to heat cold or pre-heated water.

Steam injectors (also called steam jet heaters or steam sparger) are used to inject steam into fluids to achieve intensive mixing and heat transfer.

1. Acceleration of the medium to be heated by a Venturi nozzle
2. Steam is introduced tangentially to the injector housing and exits through an annular gap
3. The medium to be heated is thus enclosed by the steam in the form of a shell
4. In the subsequent conical part, intensive mixing takes place with complete condensation of the steam
5. There is a complete transfer of the thermal energy of the steam to the medium