Inline & Tank Eductors for Pumping | Mixing | Heating

Tank Heating Eductors

Tank Heating Eductors
Tank Heating Eductors

Tank heating eductors provide a direct contact of the steam into the liquid. This assures complete transfer of the energy in the steam into the liquid being heated. Other types of heating lose efficiency as the interior of the heat exchanger builds up a scale. With eductors, the velocity of the steam being injected into the vessel also causes the liquid contents of the vessel to be agitated while heating occurs, without the need for other types of mixers in the vessel. This provides for more even heating of the vessel contents. They also permit the steam to be dispersed over more of the liquid volume, resulting in a more homogenous heating than with other methods of injecting steam.

These designs of eductors allow steam to be used from 10 to 140 PSIG for heating. Because of the nature of direct steam injection, heating vessels at atmospheric pressure beyond 140° F should not be attempted. Exceeding this temperature could result in uncondensed steam evolving from the liquid.

Tank Eductor Sizing Request Form (We’ll reply with the recommended size along with price & availability)

Tank heating eductors, also known as steam spargers, are devices that use steam to heat liquids inside of tanks. They work by injecting steam into the liquid at a high velocity, which creates a turbulent flow that heats the liquid quickly and evenly.

Tank heating eductors have a number of advantages over other methods of heating liquids, including:

  • High efficiency: Tank heating eductors transfer heat from the steam to the liquid very efficiently, with efficiencies of up to 95%. This is because the steam is injected directly into the liquid, eliminating any heat loss that would occur with a heat exchanger.
  • Even heating: Tank heating eductors create a turbulent flow that mixes the liquid and heats it evenly. This is especially important for viscous liquids or liquids with solids in suspension, which can be difficult to heat evenly using other methods.
  • Self-agitation: The turbulent flow created by tank heating eductors also agitates the liquid, which can help to prevent the formation of scale and other deposits on the inside of the tank.
  • Low maintenance: Tank heating eductors have no moving parts, so they are very low-maintenance and require little to no downtime.

Tank heating eductors are used in a wide variety of applications, including:

  • Heating water and other liquids in industrial and commercial processes
  • Heating wastewater and other fluids in treatment plants
  • Heating food and beverage products
  • Heating pharmaceutical and chemical products
  • Heating agricultural products, such as milk and syrup

If you are looking for a highly efficient and reliable way to heat liquids in a tank, then tank heating eductors are a good option to consider.

*** To help eliminate steam hammer, ensure that the minimum absolute pressure of the eductor is at least twice the absolute pressure inside the tank, at eductor depth.


Gallons Heated Per Minute - (GHPM)
Operating Steam Pressure (hm)
SizeTemp Rise °F20 PSIG40 PSIG60 PSIG80 PSIG100 PSIG120 PSIG140 PSIG

Heating with Steam

Steam is supplied in a gaseous state.  Heat transfer with saturated steam utilizes the latent heat of steam, releasing a large amount of energy as it condenses (changes to the liquid state).  The amount of energy released per unit of steam is high (up to 539 kcal/kg, or 970 Btu/lb, and higher with vacuum steam).

Summary of Benefits

Utilizing latent heat (steam heating) for heat transfer is far more effective than utilizing sensible heat (hot water or oil heating), as a much higher amount of energy is released in a shorter period of time.

This offers the following benefits:

Property Advantage
Rapid even heating through latent heat transfer  Improved product quality and productivity
Pressure can control temperature Temperature can be quickly and precisely established
High heat transfer coefficient Smaller required heat transfer surface area, enabling reduced initial equipment outlay

How Does Steam Provide Stable, Even Heating?

Unlike heat transfer by convection (e.g. hot water), heat transfer by condensation (e.g. steam) does not involve a temperature change. When steam condenses on the heat transfer surface, it passes on its latent heat to the product. The condensate then formed still contains its sensible heat, so it is of the same temperature as the steam from which it was produced. This enables even heating across the whole heat transfer surface.

If the pressure at the heat transfer surface of the equipment is held constant, continuous heating at a constant temperature can take place throughout every part of the heat transfer surface.

On the other hand, with hot water or oil heating, the temperature of the heating medium is reduced as sensible heat is transferred from the heating medium to the product. The temperature gradient is therefore constantly dropping because each unit of heat transferred will also lower the heating medium’s temperature. This can result in uneven heating, which may adversely affect the product being heated.

How Does Steam Provide Rapid Heating?

Heat Transfer from Condensation (Steam)

The secret is in the transfer of heat resulting from the process of condensation.

The latent heat contained in steam is released the instant steam condenses into the liquid state. The amount of latent heat released is 2 to 5 times greater than the amount of sensible heat available from hot water (saturated water) after condensation. This latent heat is released instantaneously and is transferred through the heat transfer surface to the product being heated.

Through condensation, steam naturally flows against the heat transfer surface. This helps speed the heating process.

Heat Transfer by Convection (Hot Water and Oil)

In contrast, hot water and oil transfer heat by convective heating, which does not involve a change of state. If left to natural convection, heat transfer is extremely slow. Thus, a pump is typically used to create flow against the heat transfer surface to increase the rate of heat transfer. This is known as forced convection heating.

Scan to visit/share page