Tubular heaters have the longest lifespans of any heater. A heating coil is inserted into a metal pipe, and MgO powder is used to fill the space between the metal pipe and heating coil to create a tubular-shaped construction.

This heater is used in a variety of applications due to its flexible shape, which is one of its major features. It is widely used in many fields to heat both gas and liquid, not to mention defrosting.

At Kawai Corporation, our completely made-to-order system flexibly handles your usage environment, offering you the product that meets your needs.

From small lots to mass-production, Kawai’s flexible factory line is ready to meet the challenges our customers demand.


Thermal gradient is required

  • Coarse-to-fine heat zone type (straight type)


  • Molded type

Strengthened corrosion resistance

  • Titanium heater
  • Surface finishing


  • For vacuum use (hermetic seal)
  • Square sheath type
  • With flange
  • With screw plug
  • With fins
  • Casted type
  • Brazed type


Sheath Length 10″ to 14 ft. / 250 mm to 4300 mm
Diameter (Φ) (mm) 5.3, 6.5, 8, 10, 12, 14, 16
(inch) 1/5, 1/4, 0.31, 0.4, 0.47, 0.55, 0.63
Operating Temp.* Up to 1560ºF / 850ºC
Max. Watt Density* 77.5 W/in2 (immersion) / 12 W/cm2 (immersion)
Max. Voltage (V)
Max. Resistance Density
Wattage Tolerance +/-10%
Outer Dimension Tolerance
Insulation Resistance (MΩ/DC V)** More than 1000/500
High Pot Test (V/min.) / (V/sec.) 1500 / 1800 (5 mA)

Correlation between Watt Density and Temperature Rising Speed


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