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HEX Series

Explosion-Proof Electric Unit Heater

In environments where hazards or a risk of explosion are present, safety is non-negotiable. The Modine HEX Explosion-Proof Electric Unit Heater is engineered to provide safe, consistent heating in settings where flammable gases, vapors, or airborne contaminants are a concern. Featuring a fully enclosed, explosion-proof design and corrosion-resistant construction, the HEX delivers outstanding performance with the reliability you expect from Modine.

Models

  • 9 Model Sizes: 3.0 kW (10,250 BTU) to 35.0 kW (119,450 BTU)
Where To Buy

Highlighted Features

Safe, Clean Electric Heat

With all-electric operation, the HEX eliminates combustion-related risks while providing consistent, efficient heat—making it ideal for chemical plants, oil and gas facilities, and other classified workspaces.

Explosion-Proof Construction

The HEX is designed and certified for use in Class I, Division 1 and 2 hazardous locations—delivering safe, reliable electric heat in areas where flammable gases, vapors, or dust may be present.

Rugged, Industrial-Grade Design

Constructed from heavy-duty materials with corrosion-resistant finishes and fully enclosed components, the HEX ensures dependable performance and long service life in demanding industrial environments.

Product Details & Specifications

Key Features

Performance

  • Liquid-to-Air Heat Exchanger Core features an efficient finned-tube design that optimizes heat transfer and allows for easy removal from the bottom, significantly reducing maintenance time.
  • Non-hazardous Heat Transfer Fluid: Fluid circulates through the heater core, ensuring consistent temperature control and offering freeze protection down to -49°F (-45°C).
  • Explosion-Proof and Motor-Driven Fan includes a thermally protected, automatic-reset motor that evenly distributes air across the finned tubes, promoting uniform heat distribution.
  • Adjustable Extruded Aluminum Louvers direct warm air precisely where it’s needed, enabling controlled and efficient heating.

Construction

  • NEMA Type 7 & 9 Enclosure features a rugged, explosion-proof housing with large heavy-duty aluminum data plate protects vital internal components.
  • A corrosion-resistant, epoxy-coated 14-gauge steel cabinet encloses the heater core, motor, and fan assembly, ensuring durability even in harsh environments.
  • Narrow-gap, two-piece fan guard shields all moving parts for personnel safety while maintaining airflow.
  • Factory-wired motor connections use copper conductors enclosed in steel conduit, protecting the electrical connections from damage or exposure.

Protection & Safety

  • Automatic Bimetal High-Limit Control: Provides over-temperature protection, rated for 100,000 cycles of service for long-term reliability.
  • Pressure Relief Valve: Ensures over-pressure protection of the sealed heat-transfer system.

Additional Features

  • Modular design allows straightforward servicing and replacement of the heat-exchange core.
  • Built to Modine’s industrial standards for hazardous-location applications, ensuring safety, compliance, and longevity in extreme conditions.
  • UL-listed for Class I, Divisions 1 & 2, Groups C & D; Class II, Division 1, Groups E, F, and G; Class II, Division 2, Groups F and G.
Options

Factory-Configured Base Options

  • Capacity Options (kW Rating & BTU):
    • HEX6-3: 3.0 kW (10,250 BTU)
    • HEX6-5: 5.0 kW (17,050 BTU)
    • HEX6-7.5: 7.5 kW (25,600 BTU)
    • HEX6-10: 10.0 kW (34,100 BTU)
    • HEX6-15: 15.0 kW (51,200 BTU)
    • HEX6-20: 20.0 kW (68,250 BTU)
    • HEX6-25: 25.0 kW (85,300 BTU)
    • HEX6-30: 30.0 kW (102,350 BTU)
    • HEX6-35: 35.0 kW (119,450 BTU)
  • Power Supply (Voltage & Phase) Options:
    • Single-Phase (1Ph):
      • 208V/1ph (Available on sizes 3.0kW through 7.5kW only)
      • 240V/1ph (Available on sizes 3.0kW through 10.0kW only)
    • Three-Phase (3Ph):
      • 208V/3ph or 240V/3ph (Available on sizes 3.0kW through 15.0kW only)
      • 480V/3ph or 600V/3ph (Available on all sizes; 20.0kW through 35.0kW are strictly 480V or 600V three-phase)
  • Factory-Installed Options (Must be ordered with the unit)
    • Factory-installed Disconnect Switch
    • Factory-installed pilot light: Indicates when the heat is on.
    • Factory-Installed Thermostat
Accessories

Factory-Installed Options (Must be ordered with the unit)

  • Factory-Installed Disconnect Switch
  • Factory-installed pilot light: Indicates when the heat is on.
  • Factory-Installed Thermostat

Field-Installed Accessories (Shipped separately for field installation)

  • Field-Installed Explosion-Proof Thermostat
  • Wall Mounting Kits (Model WMK):
    • Wall Mounting Kit for 3-10kW units
    • Wall Mounting Kit for 15-20kW units
    • Wall Mounting Kit for 25-35kW units
  • Ceiling Mounting Kit (Model HMK)
  • Basic Mounting Kits (Model BMK):
    • Basic Mounting Kit for 3-10kW units
    • Basic Mounting Kit for 15-20kW units
    • Basic Mounting Kit for 25-35kW units
Warranty
Applications

The HEX6 series is engineered for Class I and II hazardous environments where safety and compliance are non-negotiable. cULus-certified for use in hazardous locations.

Common applications include:

  • Petrochemical and oil refining facilities
  • Paint and solvent storage areas
  • Wastewater treatment plants
  • Grain mills, silos, and feed processing buildings
  • Marine, offshore, and dockside facilities
  • Chemical and fertilizer manufacturing plants

Tech Documents

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