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Instantaneous Jet Heaters
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Instantaneous Jet Heaters

Instantaneous Jet Heaters

Transvac’s range of Instantaneous Jet Heaters provide a simple, low cost, silent and reliable method of heating a liquid inline using Steam Ejector technology. Our experience in designing and manufacturing Jet Heaters spans over 45 years, making us a world leader in steam heating.

By bringing the steam into direct contact with the cold liquid, both the sensible and latent heat of the steam is fully dissipated within the liquid, making the Transvac Instantaneous Jet Heaters very efficient. Transvac Heaters are also designed to perform this operation silently to prevent undue noise and wear normally associated with steam ‘collapse’.

Typical applications

  • General process water heating
  • Reactor jacket water heating
  • Vegetable blanching
  • Chemical heating
  • Alumina refining process
  • Tank Heating


  • Low cost, simple, compact design
  • Silent in operation
  • Rapid response to automatic control
  • No residence time
  • No flame-proofing necessary
  • Materials selected to suit process

Principle of Operation

Jet heaters operate by accelerating a stream of pressurized cold liquid through a combining nozzle which creates a small pressure drop, entraining pressurised steam. The steam is then discharged into the cold liquid at a high velocity, administered by jets around the combining tube. Steam “backing up” is prevented, as this method combines both the steam and the liquor. The steam is instantaneously mixed into the liquid, which occurs silently.


All Instantaneous Jet Heaters are custom designed to suit each application with either single units or complete systems available. Proprietary and recognised codes of practice are used including ASME, PD5500 etc. Designs comply with the latest European standards and units are CE marked where applicable. Typical materials of construction include carbon steel, stainless steel, Hastelloy  etc. Connections include flanged, screwed or hygienic.

Hygienic CIP Cleaning

Food and Pharmaceutical manufacturers often spray acid and alkali solutions into process tanks as part of their CIP cleaning systems. Traditionally these CIP systems have used metering pumps for Chemical Dosing. These pumps dose chemicals into demineralised water and indirect contact Heat Exchangers to raise the solution temperature.


Using a Transvac Combined Heating and Chemical Dosing System this process can be performed efficiently and almost silently in one simple package. The first part of the system incorporates a Transvac Steam Jet Heater that heats pressurised demineralised water to the desired outlet temperature.


The second part of the system incorporates a Transvac Liquid Jet Pump that entrains and mixes chemicals with the demineralised water and discharges the solution to the spray cleaning ball.


In operation a Jet Heater injects hygienic steam at high velocity into the cool water raising its temperature almost instantaneously to the desired temperature. Transvac Heaters are custom designed to suit the process conditions and perform the heating operation silently.