Explosion-Proof Heaters Comparison Chart On Heatrex, Inc.

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	Explosion-Proof Heaters Comparison Chart

Explosion-Proof Heaters Comparison Chart

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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)
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
CSA (Canadian Standards Association)	Yes	Yes	Yes
ABS (American Bureau of Shipping)	No	Yes	Yes