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WATROD and FIREBAR Flange Immersion Heaters 

Plate Flange Immersion Heaters

Watlow plate flanged heaters are easy to install and maintain. These flanged heater products are designed for heating heat transfer fluids, medium and lightweight oils and water in tanks and pressure vessels. Plate flanged heaters are ideal for applications requiring low to medium wattage requirements.

Watlow plate flanged heaters are made with WATROD tubular elements that are brazed or welded to the flange. Stock plate flanged heaters are supplied with general purpose or moisture-resistant terminal enclosures.


Material Maximum Operating Temperatures Maximum Watt Densities
°F °C W/in2 W/cm2
Alloy 800  1600 870 100 15.5
304 stainless steel  1200 650 100 15.5
Steel  750 400 30 4.7
N/A  350 175 45 6.9
  • Watt densities to 100 W/in² (15.5 W/cm²)
  • Wattages to 18 kilowatts
  • Alloy 800 sheath temperatures to 1600°F (870°C)
  • 304 stainless steel sheath temperatures to 1200°F (650°C)
  • Steel sheath temperatures to 750°F (400°C)


  • Water
  • Boiler equipment
  • Vapor degreasers
  • Fuel oils
  • Heat transfer fluids
  • Indirect heating of viscous fluids
  • Caustic solutions

Features & Benefits:

Features Benefits
Rapid ship program
  • Minimizes downtime
Direct replacement for many OEM mold temperature control units
  • Provides a single source supplier for many OEM applications
ANSI compatible 2 and 2½ inch flanges
  • Provides appropriate heater size-to-application fit
Standard general purpose or moisture resistant terminal enclosures
  • Offers easy access to wiring
  • Limits accidental contact with termination
  • Denies access to wiring connection in local environment

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Related Literature

Specification Sheets (11)

Brochures (5)

User Manuals (11)

Engineering Bulletins (1)

Quality Certificates (1)

Catalogs (4)



WATROD and FIREBAR ANSI Flange Immersion Heaters
WATROD and FIREBAR ANSI Flange Immersion Heaters
WATROD and FIREBAR ANSI Flange Immersion Heaters
WATROD and FIREBAR ANSI Flange Immersion Heaters