Screw Plug Immersion Heaters

Screw plug immersion heaters are compact and efficient heating solutions designed for direct installation into tanks or vessels. These heaters consist of hairpin-shaped tubular elements that are either brazed or welded into a threaded screw plug, based on compatibility between the plug and sheath materials. Electrical connections are housed within a terminal enclosure for safe and convenient wiring.

Installed through a threaded opening, screw plug heaters are ideal for heating both liquids and gases in a variety of industrial applications. They are often used with additional components such as thermostats, thermowells, or control panels to provide accurate temperature regulation as per specific process requirements.

Essentially a more compact version of flange immersion heaters, screw plug models replace the flange with a threaded plug. Their design allows them to be highly effective for heating process water, oils, flammable fluids, or gases—particularly in applications requiring explosion-proof enclosures. These heaters are widely utilized in industries such as food and beverage, chemical processing, and more. Along with freeze protection and water boiling, they are also frequently used in steam generation systems.

Screw plug heaters offer excellent energy efficiency, straightforward installation, and minimal maintenance. Their robust construction makes them a long-lasting and cost-effective choice for various industrial heating needs.

Sheath Material Options and Ratings:

Stainless Steel:

Maximum Temperature: 1200°F (649°C)

Maximum Watt Density: 120 W/in²

Steel:

Maximum Temperature: 750°F (399°C)

Maximum Watt Density: 120 W/in²

INCOLOY:

Maximum Temperature: 1600°F (871°C)

Maximum Watt Density: 120 W/in²

Choosing the right sheath material is essential to ensure proper performance, durability, and compatibility with the medium being heated