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Coil Heaters

Coil heaters are high performance mini tubular heaters that have small rectangular, square or round cross sections that are flexible and can acquire different shapes and configurations.

The sheath material of standard cable heaters is stainless 304; their heating core is coiled or straight solid Nickel Chrome wire. Cable heaters can transmit up to 35 W/in2 heating capacity and can attain up to 15000F surface temperature.

Cable heaters could be coiled, to form coil heaters that are ideal whenever a large amount of heat is required in a confined space. Coil heaters have many applications but are mostly utilized as powerful heating cells inside hot runner nozzles in plastic injection molding.

Coil and cable heaters can accommodate “J” type or “K” type thermocouple sensors that could be placed internally at the tip or the middle of a heater. They can be made as well to have profiled or distributed wattage configuration.

The fine electrical terminals and thermocouple wires are attached to power and thermocouple leads inside a transition adapter which has a larger diameter than the actual heater’s cross-sectional diameter.

Although coil heaters and cable heaters are fully annealed and can acquire any shape, they should be formed to a final shape in a single attempt. Forming and bending operations harden the outside stainless shell of a heater, and re-annealing might become necessary if changing the form is required.

Coil heating elements

  • Various IDs and Lengths
  • Various Wattages and Voltages
  • Various termination orientation (see below)
  • High temp sleeving, braid, or armored termination
  • Round, square, or rectangular cross sections
  • Optional thermocouple
  • Optional straight (non-coiled) length
  • Optional distributed wattage

Coil heater sizes

ProTherm offers fast delivery on built-to-order coil heaters for plastics processing, laboratory, and other uses. This page details the varieties and specifications for coil heaters we can build for you.

These built-to-order heaters usually ship within 5–7 business days – faster if expedited.