Bundle heater
Bundle heaters are engineered for high-temperature furnace applications, delivering
robust and efficient heating for processes like aluminum smelting and steel galvanizing. These
heaters consist of circular ceramic discs that encase resistance heating elements, often paired
with radiant tubes to enhance heat transfer while protecting against refractory corrosion and gas
impurities. Materials like ferritic alloys (up to 1250°C) or nickel-chromium (NiCr) alloys (up to
1100°C) ensure durability under extreme conditions. The assembly includes terminal rods
(typically SS 310 or Incoloy), a central rod for structural support, and alumina ceramic discs for
insulation.
Design Features:
● High surface load capacity and excellent resistivity
● Flexible mounting (horizontal or vertical)
● Available in single, double, or triple rod configurations
● Optional radiant tubes for enhanced heat distribution
● Primary aluminum holding and melting furnaces
● Galvanizing and annealing furnaces in steel industries
● Heat treatment and carburizing furnaces
● Glass and ceramic processing
Long lifespan with minimal maintenance
● High thermal efficiency and reduced CO2 emissions
● Customizable designs for specific furnace requirements
● Resistant to thermal shock and mechanical stress
Technical Insight: Bundle rod heaters can achieve watt densities outputs up to 10 W/cm2,
making them ideal for high-power applications. Their ceramic disc design ensures uniform heat
distribution, minimizing hot spots and extending operational life.
