Everything about Circulation and Immersion Heaters

Water heating is one of the crucial things that happens in the industrial world and even on the commercial side. In this world, there are different kinds of heaters you can find. The circulation and immersion heaters are the two most common types of heaters.
The problem comes when you need to pick between the two if you don’t know much about these two heaters and how they are different from one another, no need to worry.
This is a complete guide where we have mentioned detailed information on circulation and immersion heaters. Not only this, we have also pinpointed some of the most significant differences between these two heaters. So, let’s jump right into the article and learn more about circulation and immersion heaters.

What are Circulation Heaters?

The first question is, what are circulation heaters? The circulation heaters are a type of heaters that can be used to heat both liquids and gases. This type of heater is most commonly used to heat the flowing or circulating fluid streams. This means the fluid will move through the medium or the cylinder, and the heat will warm it.
This means that these heaters are very different from the immersion heaters. You don’t have to immerse the heater in the water in order for it to get warm. The heating element of this heater is a tube or a cylinder, making it a closed-loop system. In most of these heaters, a temperature-controlling system or a thermostat will keep the temperature in proper range.
Because of the closed-loop system, these heaters are much more efficient, and heating time is also very quick. The circulation heaters are excellent work, ideally in industrial settings.

Applications of Circulation Heaters

Now that you know what circulation heaters are, you should also know the applications of circulation features. Following are some of the most significant features of this heater.

  • In the jacket reactor heating and cooling system, the circulating reactor is commonly used to control the temperature.
  • The circulating heating systems play a crucial role in the industries where the fuel oil preheating and heating are done.
  • These heaters are also present in the steam superheating companies.
  • For catalyst activation and dehumidification, these heaters are very commonly used.
  • Molten salt companies work on thermal storage; other high-temperature industries need heater systems. Through these systems, they can regulate the temperature of the material; hence, circulation heaters are the first choice in such settings.
  • In the food industry, the temperature of the food needs to be maintained. Hence, these heaters are needed in such cases to regulate and maintain the temperature.
  • These circulation heaters are used in other settings and companies where controlled heating is needed. Some of the common companies are the plastic companies and semiconductor companies.

What are Immersion Heaters?

The immersion heater is now coming to the other type commonly used in industrial settings. The immersion heaters are pretty simple as compared to the circulation heaters. These heaters are not tanks or cylinders; instead, they are rods or loops-like structures immersed in water or other liquid.
In this case, the heating element is in direct contact with the water and causes it to heat. The main component of an immersion heater is the heating element, which is mainly a coil or a rod. The sheath also plays an important role when it comes to these heaters because it protects the heating elements.
When you immerse the rod of the heaters in the water, the string electric current passes through the coils, and then this heats the water. You can easily compare this to the standard kitchen kettle; however, this is much bigger and more effective. One of the primary reasons people love using this type of heater is that it is versatile and straightforward.
These heaters are also rapid when it comes to eating the liquid. Therefore, these are also used in industrial sites because of their increased efficiency.

Applications of Immersion Heaters

Immersion heaters can be widely used in many different fields. They are perfect for use in residential and industrial. These heaters offer more accuracy; they are easy to install and also very easy to handle. Therefore, the following are some of the main applications of these immersion heaters.

  • In the cement industry, these immersion heaters are commonly used. They help speed up the heating process of the cement and also offer consistent results.
  • The chemical industry needs something to ensure the temperature is accurate and stable. These heaters play a vital role in making detergents, oils, soaps, and other such things.
  • In the food industry, the growth of bacteria and other pathogens is very common, and the temperature is not maintained. Therefore, you maintain the quality of the food heaters are needed. The immersion heaters work perfectly for sterilizing the food containers and maintaining the food items’ temperature.
  • Laboratories are another area where you need immersion heaters to ensure the bacteria is not growing. It is also needed for the autoclaving machines and a few other things.
  • In many places, the immersion heater is also used for water management. Hey, ensure the water is not cold and warm enough for people to use during the winter.

Significant Differences between Circulation and Immersion Heaters

Now that you know the basic information on the circulation and immersion heaters and their application, it is time to know their major differences. Mentioned below are some of the significant things that are different for each.


The first difference between the immersion and circulation heaters is the working. The circulation heaters are based on the closed-loop system. This means that the fluid is present in the cylinder or the tank, and then the current passes through it and makes it warm. The temperature then transits between the liquid particles, and the temperature increases.
On the other hand, immersion heaters are not a closed-loop system. They are rods or coils immersed in the water, and the electrical current passes through them. This electric current then goes into the water, causing the temperature to increase.

Direct and Indirect Heating

Another difference between these heaters is that one works on direct heating while the other works on indirect heating. Circulating heating is based on indirect heating because the fluid flows in the cylinder and is not directly in contact with the electrical system.
However, immersion heating works on direct heating. This is because the rod is in direct contact with the water and the electric current.

Temperature Controlling Feature

Regarding the temperature-controlling feature, the circulation heaters do not have this feature. Therefore, you won’t be able to control the temperature. This is why these are primarily used in industrial areas where you need heavy and oversized heating systems.
The immersion heaters, however, come with a thermostat. These thermostats can be used for maintaining and controlling the temperature. This will ensure that the rod does not get too hot and does not burn out.

Fluid Circulation

Fluid circulation is also an important part and one of the significant differences between immersion and circulation heaters. The fluid crucial ion means how the water or the liquid is moving. In the immersion heaters, the water is in the tanks and is not moving. The rod is simply immersed in the water, and the electrical current travels through the water and increases the temperature.
The water is present in the cylinder or the chamber when talking about the circulation heater. In the chamber, the water travels and moves from one side to another. Through the movement of the water, the energy is transmitted around, and the liquid gets warm. Hence, fluid circulation is much more prominent in the circulation heaters.

Installation of the Heaters

The installation of the immersion heaters depends on the type of heater you are purchasing. There are three different kinds of immersion heaters. The flanged, one-side, and screw plug immersion heaters. All of these have different installations; the one-side immersion heaters are the easiest to install.
Installing the circulation heaters might be slightly more complex than the immersed heaters. This is because you must ensure that inlets are facing correctly. Therefore, in most of these cases, you might need professional help to ensure you install these heaters correctly.

Wrapping Up

Circulation and immersion heaters are the two most prominent names in water heating technology. These two are majorly used in different industries for the heating purposes of liquids. Both of them work amazingly. However, one might outperform the other in different scenarios.
The main problem that comes with finding the right heater and high quality. Hasteco is one of the most renowned and professional brands with the best heaters. We have been designing and manufacturing these heaters for a very long time and are now considered experts. Therefore, make sure you visit our product page if you want to find good heaters.

Sales representive Luke


As the devoted CEO of Hasteco, I've spent countless years nurturing my passion for heating elements. Warmly inviting you to connect & collaborate for cozy, tailor-made solutions. Get in touch!

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