Watlow Square Flange Immersion Heater

• Watt densities to 100 W/in²
• Wattages to 24kW
• Voltages to 480VAC
• Incoloy sheath temperatures to 1600°F
• 2-1/2, 3-1/8, 4-1/2 inch square flanges
• Asbestos-free gaskets
• Epoxy or silicone resin seals rated to 250°F or 390°F

Designed for use in boilers and industrial storage tanks, Watlow square flange immersion heaters offer an energy
efficient solution to heating water, oils, and degreasing solutions.

Watlow square flange immersion heaters feature Watlow’s industry-leading WATROD® or FIREBAR® heating
elements. These elements can be brazed, staked, or welded to a four- or six-bolt flange and mounted directly to a
mating flange that is welded to a tank wall nozzle.

Installation and maintenance of Watlow square flange immersion heaters is easy. Heater change-out is also simple.
Unbolt the flange and replace it with another without extensive equipment downtime.

By using WATROD® or FIREBAR® heating elements, these Watlow square flange immersion heaters are rated
up to 24kW and can generate watt densities up to 100 W/in² and sheath temperatures up to
1600°F (depending upon sheath material). A number of sheath material and other options exist to make the
Watlow square flange immersion heaters suitable for nearly any application.

Applications for the Watlow Square Flange Immersion Heater

• Water
• Boiler Equipment
• Vapor Degreasers
• Fuel Oils
• Heat Transfer Fluids
• Caustic Solutions

How to Order

Please contact us to order a Watlow square flange heater immersion heater. To help us determine which Watlow heater
will best satisfy your application requirements, please determine as closely as possible the flange size and material, volts,
watts, phase, number of elements, sheath material, and immersed length. Please consult the
Watlow Square Flange Immersion Heater Data Sheet PDF
for additional information.