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Explosion-Proof Heaters Comparison Chart


Only Heatrex offers a selection of explosion-proof heater constructions to meet your specific application.
  • 233 Series: Our most popular and versatile construction has a broad range of stock designs, special options and the industry’s lowest Ignition Temperature Code rating, 320°F (160°C).
  • 236 Series: The industry’s smallest and most economical design for Class I, Group D applications up to 12 KW.
  • 254 Series: Small, compact design with a wide range of optional built-in controls.






Comparison Chart
Features 233 Series 236 Series 254 Series
Hazardous Location NEC Classifications Class I, Divisions 1 and 2, Groups C and D
Class II, Divisions 1 and 2, Groups E, F and G
Class 1, Zones 1 and 2, Groups IIB
Class I, Divisions 1 and 2, Group D
Class 1, Zones 1 and 2, Group IIA
Class I, Divisions 1 and 2, Groups B, C and D
Class II, Divisions 1 and 2, Groups E, F and G
Class 1, Zones 1 and 2, Groups IIC
Ignition Temperature Code T3C
320°F (160°C)
T3
392°F (200°C) (Varies with KW)
T3C
320°F (160°C) (Varies with classification)
KW Range Up to 30 KW Up to 12KW Up to 9.5 KW
Standard Built-In Overtemperature Protection Dual overtemperature protection with automatic and manual reset thermal cutouts Primary and secondary automatic reset cutouts with fan relay Primary automatic reset cutout
Other Standard Built-In Controls Controlling contactor, control circuit transformer Controlling contactor None
Standard Control Voltage 24V 120V Maximum 277V
Single Point Line Voltage Connection for Incoming Power Yes Separate 120V motor line required Yes
Optional Built-In Controls
Thermostat Yes Yes Yes
Disconnect Switch Yes No No
Selector Switch Yes No No
Manual Reset Cutout Standard Yes No
"Heater On" Pilot Light Yes No No
"Warning" Pilot Light Yes No No
Control Circuit Transformer Standard No Yes
Standard Construction
Heater Assembly Liquid-to-air heat exchanger, steel tube with aluminum fins, propylene glycol, immersion heater Stainless steel finned tubular elements Heater core enclosed in copper tube with large aluminum fins
Cabinet/Housing Powder coated galvanized steel Stainless steel Powder coated galvanized steel
NEMA 7,9 Control Enclosure Cast aluminum Cast aluminum Cast aluminum
Mounting Brackets Wall, ceiling or pole mounting kits (optional) Swivel mounting bracket (standard) Wall mounting bracket (standard)
Optional Constructions
Dirty Duty Corrosion Resistant Choice of 316SS Construction or Heresite® coating Yes Wet locations (NEMA 3) iridite coated elements
50 Hertz Motor Yes No N/A
Agency Approvals
FM (Factory Manual) Yes Yes Yes
CSA (Canadian Standards Association) Yes Yes Yes
ABS (American Bureau of Shipping) No Yes Yes



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