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Exd Flameproof Line Heaters

The range of Ex d flameproof line heaters are suitable for heating all process fluids which are non-corrosive to the materials of construction, providing a clean and efficient heating method for bulk liquid flow applications. The Ex d flameproof line heater range is certified for use in hazardous areas where the atmosphere is classified as a Zone 1 or 2 (IIA, IIB, IIC) gas group, or a Zone 21 or 22 (IIIA, IIIB, IIIC) dust group.

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  • Thermal insulation and cladding
  • Weatherproof terminal enclosure to IP66
  • Internal control thermostats and over-temperature thermostat
  • Alternative materials of construction available
  • Designed for horizontal installation (vertical mounting version available on request)

  • Engine jacket pre-heating
  • Fuel oil
  • Heat transfer oils
  • Indirect heating of liquids
  • Industrial washing and rinsing processes
  • Lube oil pre-heating
  • Temperature maintenance of storage tanks
  • Tempering of low grade residual oils for burners and engines
  • Under floor heating schemes


  • ATEX/IECEx II 2 G/D Ex d IIC T1 to T6 Gb Zone 1 and 2
  • ATEX/IECEx Ex tb IIIC T450°C to T85°C Db Zone 21 and 22 (IP66)
  • CU TR (EAC), CNEx, CCOE (CCEs), Inmetro & KGS
  • CSA (CEC/NEC) Class I, Div 1, Groups A, B, C, D; T1 to T6, Enclosure Type/NEMA 4 or 4X
  • CSA (CEC) Ex d IIC; T1 to T6 Gb, IP66 (Canada)
  • CSA (NEC) Class I, Zone 1, AEx d IIC; T1 to T6 Gb, IP66 (USA)


  • Incoloy 825 or 316L stainless steel sheathed rod-type or removable ceramic core type housed in mild steel or 316L stainless steel


  • Mild steel or 316L stainless steel sheath


  • Stucco aluminium


  • Standard supplies up to 690V (600V CSA)


  • Flameproof protection to IP66

Working Pressure

  • Up to 10 barg/145 psig, subject to design parameters

Design Code

  • Sound Engineering Practice (SEP)


  • Up to 120kW (subject to application)”
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