254 Series Explosion-Proof Convector

Heatrex’s 254 Series explosion-proof convector is designed to provide a heavy duty and corrosion resistant heat source.

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Standard Features

Wide Selection of Sizes
Four compact sizes to fit any space with ratings from 500 to 9500 watts.

Sloped Top Cabinet
Prevents objects from being set on top of the convector, which can restrict airflow and cause overheating.

Single and Three-Phase
Unique design provides single and balanced three-phase loads in a single element.

Gas and Dust Atmospheres
Three listings cover the entire field, two for hazardous gases and vapors and one for dust particles.

Wet Locations
All unit sizes available with iridite-coated elements and powder-coated frames for NEMA 3 wet locations.

Construction Features

Grade A Nickel-Chrome heating coils are insulated with ceramics and magnesium oxide from the copper heater tube and fitted with large aluminum fins locked in place.

Heavy gauge steel cabinet is painted with a beige powder coat for durability. Cabinet should be mounted at least 6 inches (152 mm) above the floor. Factory-furnished wall brackets make installation easy.

Thermal Protection
A linear limit, automatic reset thermal cutout is built into every unit.

Complete Electrical Package
For larger single-phase and all three-phase units, a built-on contactor/transformer option package is available.


Battery Storage Areas
Chemical Plants
Coal Handling Facilities
Dry Cleaning Plants
Gasoline Fueling/Storage Areas
Grain Elevators
Oil Refineries
Paint Spraying/Storage Areas
Petrochemical Plants


Class I, Divisions 1 and 2, Groups B, C and D
Class I, Zones 1 and 2, Group IIC

Comparison Chart

Features ULTRA-SAFE™ EXP COMPACT Convector
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 I, Zones 1 and 2, Groups IIB
Class I, Divisions 1 and 2, Group D
Class I, 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 I, Zones 1 and 2, Group IIC
Ignition Temperature Code T3C
320°F (160°C)
392°F (200°C) (Varies with KW)
320°F (160°C) (Varies with classification)
KW Range Up to 30 KW Up to 12 KW Up to 9.5 KW
Standard Built-in Overtemperature Protection Dual overtemperature protection with automatic manual reset thermal cutouts Primary and secondary automatic reset cutouts with backup contactor, fan delay relay Primary automatic reset cutout
Other Standard Built-in Controls Controlling contactor, control circuit transformer Controlling and backup 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 No Yes
Disconnect Switch Yes No Yes
Selector Switch Yes No No
Manual Reset Cutout Yes No
“Heater On” Pilot Light Yes No No
“Warning” Pilot Light Yes No No
Control Circuit Transformer Yes No Yes
Step Controller No No No
Power Fusing No No No
Standard Construction
Heater Assembly Liquid-to-air heat exchanger, steel tube with steel fins, propylene glycol, immersion heater Heavy gauge 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 steel
NEMA 7, 9 Control Enclosure Cast aluminum Cast aluminum Epoxy coated steel
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 Hz Motor Yes No No
Agency Approvals
CSA (Canadian Standards Association) Yes Yes Yes
ABS (American Bureau of Shipping) No Yes Yes
Stock Designs Available Yes Yes

Closed Tank Heating

Watt Density

Percentage of Wattage

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