Immersion Heaters

Tubular elements are commonly used in immersion heater applications because they are comparatively inexpensive to manufacture as compared with other heating systems - hence their appeal in domestic, industrial and commercial applications. They are available in a variety of tube materials, diameters with a host of fittings. This information and technical data can be found on the tubular heating elements page in this on-line catalogue. Immersion heaters come in a variety of forms; with the most common being glanded, over-the-side and flanged.

Types of Immersion Heaters

Glanded Immersion Heaters

These heaters are most suitable for permanent installation into sheet metal containers, tanks, vats, etc. They can be manufactured in a wide range of sizes, ratings and sheath materials to suit.

The two forms illustrated allow the heater to be glanded through the side or bottom of a tank dependent upon tank restrictions, or variations made to suit all installation problems. Refer to page 7 for other common forms of tubular layouts to suit many tank installations. Information required includes dimensions of container, restrictions inside tank if any, and particulars of the liquid to be heated.

Over the Side Immersion Heaters

Tubular over-the-side immersion heaters are designed for use in liquids or solutions where easy removal of heaters for periodic inspection or cleaning is necessary, and where modification to an existing tank is impracticable to suit other forms of heating. The portability of over-the-side immersion heaters allows for multiple heaters to be easily added and removed as required.

The Hotco range of over the side immersion heaters feature a liquid tight electrical termination. Used mainly in the metal finishing industry where acids and other liquid chemicals are heated. Splashes and spillages are no longer a concern as the electrical termination is totally encapsulated in a rubber moulding, thus eliminating the problem of moisture causing premature electrical failure.

Flanged Immersion Heaters

Hotco manufacture a varied range of flanged immersion heaters for direct immersion into water, oils, resins, food stuffs and many other liquids and gasses. A standard immersion heater consists of a number of robust hairpin shaped tubular heating elements welded or glanded into a blind pipe flange. All units have heaters in multiples of three for use with single or 3 phase power supply, and are terminated in a protective steel junction box. This type of unit gives simple, low cost installation, 100% heating efficiency generated within the solution, and minimum resistance to the circulation of solutions to be heated.

The immersion units have standard pipe flanges and are easily installed through a matching companion flange fitted to the product tank. This makes Hotco Immersion Heaters suitable for a variety of positions in tanks, vats, pipes or irregular shaped vessels.

Circulation Heaters

Hotco circulation heaters are designed to heat liquids or gases which flow through pipework on either a recirculating or single pass basis. Using the appropriate flanged immersion heater as a heat source, and with the addition of baffles and a barrel to create a cross flow effect over the heaters. In-line circulation heater are ideal for the remote heating of storage vessels and materials as they flow through process pipework.

Systems range from small 5kW to a mammoth 400kW and can have single or multiple chambers. They can be mounted vertically or horizontally - manufactured to heat oils, waters, chemicals and gasses.

Drum Immersion Heaters

Hotco carry a full range of Drum heaters including direct immersion heaters specifically designed for standard size storage drums. For further data on these heaters and other drum heaters, please click on this Drum Heating link to view the Process Heating Page on-line


Hotco has an extensive range of stock immersion heaters and also custom-make heaters to specific requirements. As always. If you need assistance in designing or selecting the right heater for your application our team of technicians are available to assist.