Armstrong Heaters
3-Stage Heater
2-Stage Heater
Impedance Heater
Impedance Heater
Radiant Heater
Heater Bundles

Armstrong Chemtec brings 70 years of process heat transfer experience to electric heater design.

Armstrong Chemtec will work with you to determine the best electric heater for your application. In addition to meeting all thermal and hydraulic constraints, Armstrong Chemtec electric heater design also considers process and fluid behavior.

Electric Heater Benefits

  • Precise temperature control with fast response times
  • Ideal for heating fluids to high temperatures
  • Unlimited turndown
  • Suitable for hazardous areas
  • No in-plant emissions

Control Panels

Heater Control Panel

Armstrong Chemtec custom designs and manufactures every power control panel to the unique requirements of each electric heater.

Each control panel incorporates your requirements with industrial norms using field proven parts and heavy duty, conservatively sized, power cabling in a NEMA or IEC enclosure.

Available Components:

  • Ammeter
  • Anti-Condensation Heater
  • Circuit Breaker
  • Contactor
  • Control Transformer
  • Filtered Cooling Fans
  • Ground Fault Relay
  • High Temperature Switch
  • PLC with HMI
  • Temperature Indicating Controller
  • Thyristor
  • Thyristor Short Circuit Detector
  • Voltmeter
  • Watt Transducer

Available Trips:

  • Enclosure Door Switch
  • Ground Fault
  • High Element Temperature
  • High Thyristor Temperature
  • Operator Signal (Including Low/No Flow)
  • Safety/Shut Down

Many of the available components and trips are provided standard within Armstrong Chemtec power control panels.

Electrofin Heaters

Armstrong Chemtec finned element heaters provide the features of electric immersion heaters with larger heat transfer surface areas for a given shell size, making them ideal for high viscosity and low Reynolds number flows.

A thick sheath and welded fins make this heater very durable, leading to a long operational lifetime. Various fin geometries and the three-phase nature of the elements add to the versatility of the Electrofin heater.

Fluidized Bed

Fluidized Bed

Armstrong Chemtec fluidized bed radiant heaters heat and maintain temperature for fluidized bed reactors.

These low maintenance heaters are supplied in three 120° sections, and encapsulate the entire section of the reactor that requires temperature control. Armstrong Chemtec fluidized bed radiant heaters have been used most frequently in catalyst regeneration, activation, dehydration, and polysilicon manufacturing.


  • Internally insulated shell casing with 200 to 300 mm of modular ceramic fiber
  • Ability to accommodate large diameter pressure vessels and heat them to 1090 °C (2000 °F)
  • Indirect heat transfer
  • Accessible, replaceable radiant heating elements secured to the inside wall of the insulation

Immersion Heaters

Immersion Heater

Immersion heaters employ a bundle of metal sheathed, U-shaped electric heating elements enclosed in a pressure-containing shell.

Armstrong Chemtec immersion heaters are used in applications where there is a relatively high heat transfer rate from sheath to process fluid. These heaters are designed using proven temperature determination techniques to optimize performance and element life.

Features include:

  • Significant standoff between the terminal box and tubesheet, allowing for low temperature wiring in the terminal box and preventing process leakage into the terminal box
  • Thermocouples welded to element sheaths, assuring accurate element temperature monitoring
  • Element moisture seal, offering protection against equipment failure and startup delays
  • TIG welded element joints , preventing process fluid leakage
  • Large terminal box, providing easy access for installation and maintenance
  • Duplex thermocouples (optional), allowing for redundancy or spares provision

Impedance Heaters

Impedance Heater

Armstrong Chemtec impedance heaters necessitate the integration of electrical engineering, heat transfer engineering, and mechanical engineering concepts by using the process fluid containment vessel as the electric heating element.

Armstrong Chemtec impedance heaters range in size from 10 kW to over 1 MW. These heaters have been used in a wide variety of difficult process applications, such as:

  • Heating supercritical fluids, including water, ammonia and carbon dioxide
  • Heating gases to temperatures above 1010 °C (1850 °F)
  • Tubular reactors requiring heat input
  • Heating fluids at pressures in excess of 240 bar(g) (3500 psig)

Radiant Process Heaters

Radiant Process Heater

Armstrong Chemtec Radiant Electric Process Heaters are used for heating process gas streams, including those that may contain fouling or corrosive components.

Some typical applications for these heaters include:

  • High temperature heating of temperature sensitive fluids
  • Supply heat for chemical reaction
  • Thermal decomposition of hazardous substances
  • Preheat reaction components for fluidized bed
  • Heat thermal fluids (including heat transfer oils and salts)

In these heaters, electric heating elements, attached to the inner wall of the heater's insulation, surround a process coil and radiantly transfer heat through the coil to the contained fluid. These heaters are typically used for heating hydrogen, silicon tetrachloride, fluorine compounds, hydrocarbons, air and helium.

All parts of the heat transfer surface are heated evenly. Separate heating zones may be implemented when specific time/temperature relationships are required to optimize process results.

Armstrong Chemtec radiant process heaters are designed for long-term, reliable use. They may be made suitable for installation in classified hazardous areas by purging the process coil enclosure.


  • Vertical or horizontal configuration
  • Internally insulated shell casing with 200 to 300 mm of modular ceramic fiber
  • Ability to accommodate large pipe coils and heat them to 1090 °C (2000 °F)
  • Indirect heat transfer
  • Accessible, replaceable radiant heating elements secured to the inside wall of the insulation

Heavy-duty nickel-chrome heating elements are supported at the inside diameter of the insulation by electrically isolated, high temperature ceramic material. A serpentine or helical pipe coil configuration provides the best heat transfer while meeting your hydraulic requirements. Coil materials are typically any of 300 series stainless steel, Inconel® 600, and Incoloy® 800 and are chosen to suit your process requirements.


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