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The STARFLOW™ circulation heater is engineered to heat a flowing gas stream to 1000°F (537°C). The circulation heater's 316L stainless steel chamber houses a small diameter sheathed element, which allows for quick response to both heat-up and cool down cycles.

Watlow's starwound, coiled cable heater provides extremely efficient and reliable heating by maximizing the contact area of the gas or fluid with the element. Because the element is sheathed, the unit can operate in gas streams requiring a clean environment as well as atmospheres containing contaminants and moisture.

This circulation heater provides superior performance compared to units with internally exposed or open element wires.


Material Maximum Operating Temperatures Maximum Watt Densities
°F °C W/in2 W/cm2
316L Stainless steel  1000 537 30 4.6
  • Temperatures up to 1000°F (537°C), 316L stainless steel sheath
  • Maximum watt densities to 30 W/in² (4.7 W/cm²)
  • Maximum voltage to 240V


  • Semiconductor processing
  • Curing and drying
  • Electronics
  • Heat shrinking
  • Thermoforming/sealing

Features & Benefits:

Features Benefits
Small diameter heater
  • Allows for quick response time
Internal starwound element
  • Provides fast, efficient heating
Sheathed element
  • Provides the ability to heat in clean or impure streams
Flexibility in configurations
  • Allows for adaptability to any process
316L stainless steel
  • Provides a rugged and corrosion resistant construction
Electropolishing available on all wetted surface
  • Reduces particulate contamination Note: contact factory for ultra-high purity applications
Low pressure loss
  • Minimal flow restriction Note: not suitable for use as a pressure vessel
Type J or K thermocouples
  • Provides precise control and high-limit safety