Chromalox OT Series Strip Heater – Product Spotlight

Chromalox OT Series Strip Heaters are used principally for convection-type air heating and clamp-on installations. Installed with the proper sheath, Chromalox strip heaters can reach operating temperatures up to 1,500°F.


Chromalox OT Series Strip Heats, available at! Pictured is an 18 inch strip with a chrome steel sheath.


The foundation of the OT series heater is the high quality, coiled allow resistor wire, uniformly spaced over the width and length of the strip heater to assure even heat distribution. Resistor wire is embedded in high-grade refractory material which insulates the resistor and transfers heat to the sheath. The refractory itself is compressed under tremendous pressure to rock hardness and high density, maximizing its ability to transfer heat. Finally, the entire element is coated with a high emissivity black oxide finish, which guarantees maximum heat transfer the instant the element is energized.

Four sheath material choices allow for varying maximum temperatures:

  • Rust-resisting iron, up to 750°F
  • MONEL (nickel alloy), up to 900°F
  • Chrome steel, up to 1,200°F
  • INCOLOY (nickel-iron-chromium alloy), up to 1,500°F

Compatible with 120-480V power supplies, OT series heaters support up to 3,000 watts. Models are differentiated by the watt density of their element, measured in watts per square inch. Heaters with low watt density are more suitable for heating thick substances with low heat transferability. High watt density is useful for heating air, metals and other heat-conducting materials.

When high operating temperatures are needed, watt density must be limited in order to not exceed the maximum sheath temperature. The maximum allowable watt density in any case is 34 W/in2.

Strip heaters are available in lengths up to 72 inches. Installation is streamlined with purpose-made Chromalox clamping devices and mounting tabs.

For more information about the Chromalox OT Series Strip Heater, contact our experts today!


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