Watlow square flange immersion heaters offer energy-efficient solutions for water, boiler equipment, vapor degreasers, fuel oils, heat transfer fluids, and caustic solutions. Featuring WATROD or FIREBAR heating elements brazed, staked, or welded to square flanges, these heaters mount directly to mating flanges welded to tank wall nozzles. Ratings up to 24kW with watt densities reaching 100W/in² provide reliable performance for industrial process heating.

Design and Construction

The square flange design simplifies installation and maintenance, allowing quick heater change-out by unbolting the flange without extensive equipment downtime. Available in 2.5, 3.125, and 4.5 inch square flange sizes, these heaters accommodate various tank configurations. Incoloy sheaths achieve temperatures up to 1600°F, while asbestos-free gaskets ensure proper sealing. Epoxy or silicone resin seals rated to 250°F or 390°F protect internal components from moisture and contamination.

Performance Characteristics

Voltages up to 480VAC accommodate standard industrial power systems. Watt densities up to 100W/in² enable efficient heat transfer across a variety of media. These heaters are particularly well-suited for water heating, boiler equipment applications, vapor degreasers, fuel oil preheating, heat transfer fluid systems, and caustic solution processing.

Ordering Considerations

When selecting a Watlow square flange immersion heater, key specifications include flange size and material, voltage, wattage, phase configuration, number of elements, sheath material, and immersed length. The compact square flange design makes these heaters ideal for installations where space constraints limit the use of larger round flange configurations.