HEF Hazardous Area Enclosure Heaters

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The HEF is self-regulating, automatically adjusting its output to match ambient temperatures. Coupled with its compact design, this makes the HEF ideal for anti-condensation, frost protection and temperature control for all instrumentation and switch gear applications. The HEF range is certified for use in hazardous areas where the atmosphere is classified as a Zone 1 or 2 (IIC) gas group.



  • Certified and declared in accordance with ATEX directive 2014/34/EU
  • Certified to CSA (Divisions and Zones) standards for North American markets
  • Compact, low profile, 316 stainless steel case, requires minimal space
  • Self-regulating - can be used without a thermostat
  • Suitable for ambient temperatures from -60°C (-55°C for CSA certified models only) to +80°C
  • Mounting of the heater can be in any orientation
  • Design allows for closer installation proximity to internal components and cables (minimum distance 100mm away)


Model HEF30 HEF50 HEF100 HEF200 HEF500
Output 30W 50W 100W 200W 500W
Weight 0.4kg 1.0kg 1.5kg 3.0kg 6.5kg
Size of Casing SIZE 0 SIZE 1 SIZE 2 SIZE 3 SIZE 4
ATEX / IECEx / CU TR / KGS Certified Models T4 T4 T4 T4 T4
CSA Certified Models (T4 on special request) T3 T3 T3 T3 T3


Certification ATEX / IECEx
II 2 G Ex e IIC T4 Gb

CAN: Class I, Division 2, Groups A, B, C and D, T3 or T4
CAN: Ex e IIC T3 or T4 Gb
USA: Class I, Division 2, Groups B, C and D, T3 or T4
USA: Class I, Zone 1, AEx e IIC T3 or T4 Gb

CU TR / EAC (formerly GOST)
2 Ex e II T4

Ex e IIC T4
Casing 316 perforated stainless steel
Element Self-regulating
Controls The HEF is self-regulating, automatically reducing its output as the ambient temperature rises. If overall enclosure temperature control is required, it is recommended that the HEF heater be used in conjunction with the AFT, HFT or FXT flameproof air sensing thermostats
Mounting The heater may be mounted in any orientation, using appropriate securing bolts through the mounting feet or DIN rail holes
Rating The HEF range is available in a nominal 30W, 50W, 100W, 200W and 500W outputs
Voltage Models available for 110V to 120V and 230V to 240V 1 phase supplies (max 254V subject to design parameters)
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