Compact Explosion Proof Unit Heater – Maltec-H ATEX/IECEx


  • Compact Size
  • Low Cost
  • Redundant Over Temperature Protection
  • Stainless Steel Construction
  • Optional Marine Duty Construction
  • Standard: IEC 60675

Compact explosion-proof unit heater is designed with both size and economy in mind. Compact advantages and unique features include:

  • Compact Size: This small design is only 13 inches wide, which makes it ideal for applications where limited space is available.
  • Low Cost: The COMPACT design offers the most economical solution for heating small Class I, Group D hazardous areas. It is a cost effective alternative to the use of explosion-proof convection heaters.
  • Redundant Over Temperature Protection: Primary and secondary automatic reset thermal cutouts for additional safety.
  • Stainless Steel Construction: Provides superior corrosion resistant protection. Optional Dirty Duty construction adds polyester powder coating to all aluminum parts for use in corrosive applications.
  • Optional Marine Duty Construction: The COMPACT design is ideal for shipboard use where size, weight and corrosion resistant construction are critical.

Standard Construction Features

  • Heating Elements
    Industrial grade, Type 304 stainless steel finned tubular heating elements.
  • Terminal Enclosure
    A NEMA 7, 9 cast aluminum enclosure with a threaded bottom cover permits easy access to the built-in controls from underneath the heater.
  • Housing
    Round, 16-gauge stainless steel shroud.
  • Grilles
    An adjustable stainless steel louvered outlet grille directs airflow 45° up or down and a heavy gauge stainless steel rear grille protects against accidental contact with the fan blade.
  • Stainless Steel Swivel Mounting Bracket
    Supplied as standard with all COMPACT explosion-proof unit heaters. This multi-purpose bracket can be used for either wall or ceiling mounting.
  • Built-In Controls
    Include primary and secondary automatic reset overtemperature cutouts, controlling contactor, and a time delay relay which keeps the fan running to cool the heating elements after they have been de-energized.
  • Fan Motor Assembly
    Consists of a 120-volt, 1-phase 60 hertz motor fitted with an aluminum fan blade. The totally enclosed motor is UL Listed for Class I, Group D applications and includes permanently lubricated ball bearings and built-in thermal overload protection. The motor is factory wired into the enclosure to reduce field wiring, but requires a separate 120-volt power supply.

Custom Options

  • Dirty Duty Corrosion Resistant Construction
    Includes polyester powder coated fan blade, wiring conduit and fittings, NEMA 4X, 7, 9 enclosure.
  • Marine Duty Construction
    Dirty Duty Construction with manual reset thermal cutout. Meets U.S. Coast Guard requirements per 46CFR-111.87 and is ABS Approved
  • Manual Reset Cutout
    Can be specified to replace secondary automatic cutout.
  • Adjustable Thermostat
    Factory installed and prewired to the control enclosure. Thermostat is adjustable from 50° to 90°F (10° to 32°C) range.


  • Chemical Storage & Handling Areas
  • Compressor Stations
  • Marine and Offshore
  • Oil Platforms and Refineries
  • Sewage & Wastewater Treatment Plants
  • Spray Booths


  • Remote Thermostat
    A remote wall mounted thermostat is available.


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