Bayonet Immersion Heaters Designed for Maximum Efficiency
Enerquip’s bayonet immersion heaters are an efficient way to heat, cool, or control the temperature of an entire tank of contents. Unlike shell-and-tube heat exchangers or suction heaters, which heat or cool the product as it moves through a system, these heaters work directly within the tank. Bayonet heaters are equipped with a tube sheet, tube bundle, and bonnet with utility connections. The tube bundle is fully immersed in the tank’s product, maximizing heating efficiency and performance.
Designed for durability with either carbon steel, stainless steel, or higher alloys, Enerquip’s bayonet heaters handle harsh conditions—including high temperatures, corrosive materials, and heavy-duty usage. Their simple design offers easy maintenance and inexpensive installation. To install, bayonet heaters are simply inserted directly into the tank through a flange. With a simple utility hookup, they’re ready to go.

Bare Tube Bayonet Heater with optional supports installed
Types of Bayonet Immersion Heaters
Enerquip offers a range of bayonet immersion heaters, each designed to meet specific heating needs across various industrial applications. With options that enhance heat transfer efficiency and provide durability in challenging environments, these heaters are customizable to suit a variety of fluid heating processes. Below are the key types of bayonet immersion heaters available, each offering distinct benefits for optimal performance.
Traditional Bare Tube Bayonet Heater
Traditional bare tube bayonet heaters feature a simple, unadorned design where the heating element is directly exposed. These tubes are typically made from stainless steel that can withstand high temperatures and corrosive environments. The bare tube design provides a direct transfer of heat to the surrounding fluid or medium, making them suitable for applications where a straightforward, efficient heating solution is required.
Helically Wound Finned Bayonet Heater
The helical wound fin design offers a significantly larger surface area compared to traditional bare tubes. These finned heaters have spiraled fins wrapped around the bare pipes, which enhances heat transfer efficiency by increasing the contact area between the heat source and the surrounding medium.
Pipe-in-Pipe Bayonet Heater
The pipe-in-pipe bayonet heater consists of a large outer pipe that houses smaller internal heating tubes, with heat-exchanging fins extruding from the outer pipe. These fins, which can range from 2 to 6 inches or more in length, significantly increase the surface area available for heat transfer. This design is highly effective in applications where space constraints require a compact yet powerful heater, or where enhanced thermal efficiency is necessary, making it ideal for heating large volumes of liquid or viscous materials in industrial settings
Double Pipe Bayonet Heater
The double pipe bayonet heater is designed with two concentric pipes, one housing the heating element and the other surrounding it. This configuration creates a thermal barrier, where the fluid flows through the annular space between the two pipes, ensuring consistent and even heat distribution along the entire length of the heater. Double pipe heaters are particularly useful in applications where temperature control is critical, as the dual-pipe structure minimizes heat loss and maximizes the efficiency of heat transfer. This makes them suitable for more delicate or precise heating processes.
Each of these designs provides unique advantages depending on the specific heating requirements and environmental conditions of the application. They are widely used in industries such as tank terminals, chemical processing, and oil and gas production, where they operate effectively at elevated temperatures.
Bayonet Immersion Heater Applications
Enerquip’s bayonet immersion heaters are available with either traditional bare tubes or helically wound fins, which provide a much larger surface area for enhanced heat transfer. These heaters are widely used in industries such as tank terminals, chemical processing, and oil and gas production, where they operate effectively at elevated temperatures.
Here are a few of their most common applications:
Chemical Processing: Our bayonet heaters are widely used in chemical processing applications to heat liquids, such as acids, solvents, and other corrosive materials.
Oil & Gas: In the oil and gas industry, our bayonet heaters are used to heat storage tanks and pipeline transfer stations.
Asphalt: Bayonet heaters are widely used in the asphalt industry for the heating of bitumen, which is a highly viscous, semi-solid form of petroleum.
Food & Beverage: Bayonet heaters are also used in the food and beverage industry to heat and cool liquid products, such as dairy products, sauces, and beverages.
Pharmaceutical: In the pharmaceutical industry, our bayonet heaters are used to heat tanks containing various chemicals, including active ingredients, solvents, and other raw materials.
Water Treatment: Our bayonet heaters are used in water treatment applications to heat water or chemicals used in the treatment process. They can also be used in colder climates to keep open top water tanks from freezing.
Power Generation: Bayonet heaters are also used in power generation applications to heat water or generate steam used in power plants.
Bayonet Immersion Heaters from Enerquip
Whether you need to heat liquids in a small laboratory tank or in a large industrial vessel, Enerquip’s bayonet heaters provide efficient and reliable heating and cooling solutions for a wide range of applications. And because customization matters, our bayonet heaters can be built with carbon steel, 316L stainless steel, or higher alloys.
Enerquip prides itself on providing quality and cost-effective solutions to its customers. Let’s talk about a solution for you. Request a quote, today.
American Heating Company is now Enerquip Thermal Solutions.