Coil Heater

Coil heaters are small, linear heating elements that can be formed into different shapes and configurations. Coiled heaters are high performance heaters which allow high wattage in a limited space.

The ability to shape coiled heaters when cold enables to heat up parts with different shapes. These heaters are typically used in nozzles and hot runners in the plastic and packing industries, but also in the railway, chemical (rubber processing), car and glass industries, hot stamping, foundries and wood treatment processes.

During coiling, the gap between turns of coil can be modified to compensate for the heat losses at each end of the coil or to insert the heating element into slots. Coiled heaters can also be cast into aluminum or bronze.

The coiled heater’s sheath material is made of stainless steel; 80/20 nickel chromium resistance wire is used for a melting temperature of 1400°C and it is manufactured with heavily compressed mineral insulator (MGO). The maximum operating temperature is 650°C or 1200°F on the stainless steel sheath and 260°C on the connection and cables.

Coiled heaters can accommodate type “J” or “K” thermocouple sensors. They can also be manufactured with distributed wattage configuration.

Trivolt Industries adopts a stringent internal quality control system (QMSM-2009). Every heater is tested for resistance and dielectric. All our heaters are CSA, UL and CE approved.

  • Applications
  • Specifications
  • Constructions
  • Different Types
  • Options
  • Injection Molding
  • Blow-Molding
  • Pressure Molding
  • Structural Foam
  • Food Industry
  • Packaging
  • Chemical (rubber processing)
  • Sheath temperature: up to 1200° F
  • Voltage of straight coil: 1250v
  • Voltage of shaped coil: 1000v
  • Voltage between cable and TC: 600v
  • Made of stainless steel
  • Minimum inside diameter: 0.375” or 10mm (consult factory for smaller width)
  • Standard diameter of round: 0.07” or 1.8mm and 0.145” or 3.7mm
  • Tolerances on diameter: +/- 0.1mm
  • Tolerances on Length: +/- 5%
  • Tolerances on wattage: +/-10%


  • Fiber glass sleeve
  • Metal braid (SS)
  • Armour cable (AC)
  • Teflon leads
  • Silicone wire
  • Ground wire
  • Quick clamp
  • Tightening clamp
  • Stainless steel ring
  • Bronze ring with SS steel cover

General Recommendations:

  • Do not reshape a heater that has already been shaped.
  • Coiled heater must be fitted tight on the heated part.
  • Heating element of coiled heater must be connected to the earth.
  • If the heater has not been used in a long time, heat it progressively during short periods of time. This will enable to get humidity out of the element.
  • Protect cables and connections against any material intrusion and do not exceed recommended temperatures of 260°C/500°F continuously.
Coil Heater

Approvals & Certifications

All our manufactured heater elements are presently CSA and/or NRTCUL approved and/or CE certified. Our products are manufactured and controlled by our internal Quality Management System. This program allows TriVolt to track the quality of every component that make up our products and monitors the workmanship of every electrical heater and sensor manufactured and assembled in our facility.

CSA Std.C22.2. no 72-M1984
UL Standard 1030 6th Edition
EN 60335-1:2004
Shock and Vibration: IEC 61373; Category 1; Class B
CAN/CSA-C22.2 No. 72-10 (2013)
UL 499 Thirteenth Editions; Class 2871-02 and 2871-82.

TriVolt Industries can also comply with any customer specifications such as “Buy America”. Our facility in Westfield, MA, USA lends itself to perform final assembly of heaters and systems to accommodate any Buy-America content requirement.

We can also generate special test conditions with specific set-ups, use computer models to design or isolate problem areas.

We are continuously improving our manufacture methods and products through testing, research and development. Our high standards extend beyond our product line.