Open Coil Heating Elements Open heating coils usually consist of one or more bare heating wires made of nickel, chromium, or other metals with high thermal conductivity. The heating element is exposed to the air or fluid, so the heat transfer efficiency is high, and the heating speed is fast.

Open coil heating elements are coiled resistance wire (usually Ni-Chrome or Kanthal, but also others) fixed onto a supporting element. Selection of correct wire gauge, wire type and coil diameter requires experience in industrial heating. Standard air heating elements are available on the market, but quit often they need to be custom built.