Tubular Electric Heaters

Convectronics’ Tubular Electric Heaters, with their unique and durable construction, are extremely versatile as they can be formed into nearly any configuration. With the broad selection of materials and terminations, combined with a wide range of ratings and sizes, Convectronics’ Tubular Electric Heaters are extremely adaptable to a wide range of industrial, scientific, and commercial applications.

Our heater design consists of a helical coil of nickel-chromium resistance wire that is precisely centered in a metal sheath. Vibration loaded magnesium oxide powder is added into the sheath, insuring even density distribution throughout its length. The entire assembly is then reduced to its finished diameter, therefore compacting the MgO, ensuring that the coil maintains its precise centering in the heater. Lastly, the sheath can be fully annealed for factory or field bending.

Tubular Electric HeatersTubular Electric Heaters

Tubular Electric HeatersTubular Electric Heaters

Sheath Material

Sheath material selection should be made based on the chemical composition of the solution being heated, the classification of the materials entering the solution, the application and the process controls used. Common sheath materials used are:

Incoloy®800: Resistant to high temperature oxidation and carburization
Common Uses: Air Heating, Radiant Heating, Cleaning & Degreasing Solutions, Plating Solutions & Corrosive Liquids


Stainless Steel: Types 304, 316 and 321
Common Uses: Food Processing Equipment & Corrosive Liquids


Steel: Low carbon, mid-range temperature applications
Common Uses: Oil Immersion, Alkaline Cleaning Solutions, Asphalt & Tar


Copper: Inexpensive alternative for low temperature applications
Common Uses: Water Heating & Freeze Protection

Sheath Material Maximum
Sheath Temp.
Maximum Watts
per sq. inch
Incoloy®800 1600°F/870°C 40
Stainless Steel 1200°F/650°C 30
Steel 750°F/400°C 22
Copper 350°F/175°C 55
  Sheath Diameters
  .250" .312" .375" .430"
Max. Sheath Length @ given Diameter 128" 118" 118" 110"
Sheath Length Tolerance +/- 1/8”
  Electrical Limits
Sheath Diameter .250” .312” .375” .430”
Minimum Ohms/inch .100 .060 .040 .040
Maximum Ohms/inch 17 21 21 21
Maximum Voltage 250 250 480 600
Maximum Amperes 15 30 30 40
Wattage Tolerance +5%-10% @ Rated Voltage
Resistance Tolerance +10% -5%
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  • Calculator
  • Standard Flow Rate (SCFM) Calculator

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    Power Flowrate Calculator

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    Temperature Conversion

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    Ohms Law Calculator

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    Pressure Conversion

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    Three Phase Unit Calculator

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    Single Phase Unit Calculator

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    Parallel Resistance Calculator

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    Series Resistance Calculator

    Calculate the resistance in ohms of resistors connected in series by entering the value of each.

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