Flanged Immersion Heater

flange mount immersion heatersFlanged immersion heaters are easy to install and maintain. Designed for heating liquids and gases in tanks and pressure vessels, these heaters are a specific type of immersion heater which are ideal for applications requiring higher kilowatts.

Watlow flanged immersion heaters are made with WATROD or FIREBAR tubular elements brazed or welded to a flange. Stock flange heaters are equipped with a general purpose terminal enclosure. These heaters, with FIREBAR elements, also answer the need for liquid immersion applications requiring high kilowatts in small tanks.

The FIREBAR element’s unique flat surface geometry packs more power in a smaller bundle, with lower watt density, making it especially well-suited for petroleum-based liquid heating applications.

In addition to flanged immersion heaters, Hi-Watt Inc. carries a wide variety of other types of immersion heaters including over the side immersion heaters, and screw plug immersion heaters. Contact us today for more information on industrial heaters and how we can help you.


Material Maximum Opening Temperatures Maximum Watt Densities
°F °C W/in² W/cm²
Alloy 800 1600 870 100 15.5
Stainless Steel 1200 650 100 15.5
Steel 750 400 100 15.5
N/A 350 175 100 15.5
Features and Benefits:
ANSI and ANSI compatible 2, 2½, 3 thru 48 inch flanges
  • Provides appropriate heater size-to-application and fit
Integral thermowells
  • Provides convenient temperature sensor insertion and replacement without having to drain the fluid being heated
Standard, general purpose terminal enclosure
  • Offering trouble free access to wiring
All units are tested and/or inspected for quality assurance
  • Ensures element-to-flange pressure seals are leak free
Drilled and tapped eyebolt holes or lift lugs for eye bolts on 10″ and larger heaters of the flange variety
  • Facilitates lifting during the installation process
WATROD hairpins are repressed (recompacted)
  • Providing improved heater life span, insulation resistance and heat transfer capabilities
Element support(s)
  • Provides proper element spacing to maximize heater performance and life
  • A standard round tubular 10″ ANSI flange can be replaced by a 6″ ANSI FIREBAR flange
  • Watt densities to 100 W/in² (15.5 W/cm²)
  • Wattages to 3 megawatts
  • UL® and CSA component recognition to 600VAC
  • Passivated 316 stainless steel sheath enduring temperatures up to 1200°F (650°C)
  • 304 stainless steel sheath handling temperatures up to 1200°F (650°C)
  • Steel sheath temperatures up to 750°F (400°C)
  • FIREBAR flange heaters are capable of delivering more killowatts in smaller bundles
  • Alloy 800/840 sheath handling temperatures to 1600°F (870°C)
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