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FP-MLH Flameproof Mini Line Heaters

The range of flameproof mini line heaters consist of a screw plug or flanged type immersion heater mounted in a thermally insulated heating vessel, and is designed to efficiently transfer heat to a flowing medium (liquid, air or gas). The FP-MLH range is certified for use in hazardous areas where the atmosphere is classified as a Zone 1 or 2 (IIA, IIB, IIC) gas group.

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  • Weatherproof protected to IP66 or NEMA 4 (FP4-MLH only)
  • Choice of built in process temperature sensors and externally adjustable option
  • Mild steel or 316 stainless steel vessel
  • Suitable for ambient temperatures from -40°C to +40°C (FP-MLH) and -60°C to +60°C (FP4-MLH)
  • Standard range of high quality Incoloy or stainless steel rod-type elements, designed for water or withdrawable ceramic core elements, designed for oil
  • Maximum allowable working pressure up to 10 barg/145 psig, subject to design parameters
  • Designed for both horizontal and vertical installation (if mounted vertically, terminal box must be located at the bottom)
  • FP4-MLH range available with multi approvals

  • Frost protection: Pre-start systems for water cooled engines, fire extinguishing equipment, oil sump heating
  • Fuel oil heating: Pre-heating to pumping viscosity
  • Heat transfer oils: Moulds, dies and platens, closed loop systems for bitumen, etc
  • Water heating: Wash rooms, industrial washing equipment, hot water storage tanks


  • ATEX Ex II 2 G
    Ex d IIC T4 to T6 Gb Zone 1 and 2
    EN 60079-0, EN 60079-1, EN 60079-7, EN 60079-31
  • CU TR (EAC)

FP4-MLH also certified to:

  • ATEX/IECEx, CSA, Inmetro, CNEx, CCOE & KGS


  • Cast aluminium alloy with a maximum of one M20 and one M25 cable entry, external and internal earths and screwed terminal cover (FP4-MLH – mild steel or 316 stainless steel)


  • High quality nickel chrome resistance wire compacted in magnesium oxide insulating powder and sheathed in corrosion resistant Incoloy 825/800, 316L stainless steel, withdrawable ceramic core elements housed in mild steel or 316L stainless steel tube


  • Maximum allowable working pressure up to 10 barg/145 psig subject to design parameters

Design Code

  • Sound Engineering Practice (SEP)


  • Mild steel or stainless steel


  • Mineral wool


  • Coated mild steel or 304 stainless steel


  • Standard units are normally designed for 220V to 254V (1 phase) or 380 to 440V (3 phase)
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