Direct Steam Injection Heaters - An Alternative Way to Heat Water

Process Optimization
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A direct steam injection heater uses 100% of its steam energy to heat water-based fluids.

This is up to 30% more efficient than an indirect heat exchanger because the steam is injected into the fluid and completely transfers all its sensible, latent, and kinetic energy. Direct steam injection heaters provide a precise and rapid response to temperature requirements over a wide range of flow rates.

Proper Operation

Direct steam injection heaters are custom sized to the application based on maximum input pressures, temperatures, and flow rates. To provide accurate control across multiple operating conditions, a direct steam injection heater is often part of a steam system that includes temperature, pressure, and flow rate sensors.

Direct steam injection heaters require minimal maintenance. The only moving parts are the actuator and the spindle assembly, which only adjust under new operating conditions. Dry inlet steam prevents wear to the nozzle and other internal components as the steam accelerates into the mixing chamber.


Direct steam injection heaters can be applied wherever hot water is needed and steam is available to heat the water. Typical applications where direct steam injection heaters can be applied include:

  • Boiler feed water
  • Wash down/hose stations
  • Shower water systems
  • Pulp stock/biomass pretreatment
  • Commercial dishwashers
  • Cleaning stations
  • Filter washing
  • Wastewater treatment
  • Industrial laundry
  • Ethanol production

Learn more about direct steam injection heaters.

Source: Kadant