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  • e l e c t r i ch e a t i n g p r o d u c t s

    c o m m e r c i a l & i n d u s t r i a l

    explosion-proof unit heater

    explosion-proof convector industrial unit heaterwashdown/corrosion resistant unit heater

    wall heater unit heater cabinet heaterconvector heater

    ceiling heater baseboard heater radiant panelwall heater

    e l e c t r i c h e a t i n g a n d c o n t r o l s

  • INTRODUCTIONHEATREX offers commercial and industrial electric heating and control systems that set the industry standard for excellence. The companys heating solutions reflect more than 80 years of innova-tion, product quality and efficient service.

    This catalog features HEATREXs complete Space Heating line. Our products include Explosion-proof an explosion-proof convector; the Washdown/Corrosion Resistant Unit Heater; and several types of standard unit heaters.

    HEATREXs line of Comfort Heating Products cover a wide range of commercial and industrial applications. Whether the requirement is for architectural wall heaters, cabinet unit heaters, convector heaters or ceiling heaters, HEATREX has a product to match the application.

    HEATREXs quality is matched only by its cus-tomer service and support. With its quick-ship delivery program, HEATREX provides the prod-ucts you need.

  • 2

    Table of ContentsAdvantages/Applications 3Use of Electric Heaters in Hazardous Locations 4-6

    Comparison Chart 7-8Explosion-proof Unit Heaters

    233 Series Explosion-proof Unit Heaters 9-15

    236 Series Compact Explosion-proof Unit Heaters 16-18

    254 Series Convector 19-26

    Fan Forced HeatersComparison Chart 27

    234 Series Washdown/Corrosion Resistant Unit Heaters 28-31

    238 Series Industrial Unit Heater 32-34

    240 Series Unit Heater 35-39

    926 Series Unit Heater 40-43

    925 Series Economical Unit Heater 44

    928 Series Vertical Unit Heater 45-47

    Wall, Ceiling and Floor HeatersComparison Chart 48-49

    933 Series Architectural Wall Heater 50-52

    932 Series Commercial Wall Heater 53-55

    935 Series European Wall Heater 56

    940 Series Hybrid Convection & Forced-Air Wall Heater 57

    934 Series Wall Heater 58-59

    930 Series Register Wall Heater 60-61

    922 Series Cabinet Unit Heater 62-65

    936/937 Series Commercial Ceiling Heater 66-69

    931 Series Commercial Ceiling Heater 70-71

    941 Series Forced-Air Ceiling Heater 72-73

    938 Series Toe-Space Heater 74

    939 Series Floor Insert Heater 75

    Radiant PanelsAS Series 76-79918 Series Heater 80-81

    Baseboard and Convector HeatersComparison Chart 83

    903 Series Commercial Baseboard Heater 84-86

    904/906 Series Architectural Sill-Height Convector 87-89

    905/907 Series Industrial Sill-Height Convector 90-92

    910 Series Aluminum Sill-Height Convec-tion Heater 93-95

    908/909 Series Architectural Convector 96-99

    914 Series Mini Draft Barrier Heater 100-102

    916 Series High Watt Density Draft Barri-er Heater 103-105

    911/912 Series Architectural Cabinet Convector 106-109

    Thermostat Selection Chart 110

    Thermstats 111-112

    Color Section Chart 113

    Limited Warranty 114-115

  • 3


    Aircraft Hangars/Service Areas Battery Storage Areas Chemical Plants Chemical Storage/Handling Areas Coal Mines/Preparation Plants Control Rooms Dry Cleaning Plants Dusty Areas Subject to Washdown Food Processing Plants

    (Washdown Areas)

    Foundries Gasoline Fueling/Storage Areas Grain Elevators Hydrogen Atmospheres Marine/Shipboard and Landbase Facilities Natural Gas (Methane) Atmospheres Oil Refineries Offshore Drilling Rigs Paint Spraying/Storage Areas

    Parking Garages Petrochemical Plants Pipeline Pumping Stations Pulp and Paper Mills Sewage/Wastewater

    Treatment Plants Solvent Recovery/

    Storage Areas Utility Plants

    Hazardous and Corrosive Area Applications

    Basements Classrooms Conference Rooms Entryways/Hallways Factories Lobbies

    Mechanical Rooms Offices Power Generating Stations Pump Houses Restrooms Service Stations/Garages

    Shipping and Receiving Areas Stairwells Storage Areas Vestibules Warehouses Workshops

    Industrial and Commercial Applications

    ExperienceThis catalog represents 80 years of experience in industrial electric heating our specialty since HEATREX was founded in 1929. HEATREX has been manufacturing products for use in hazardous locations for over 55 years.

    Complete Product LineHEATREX offers the industrys most comprehensive line of space heating equipment. Explosion-proof unit heaters are available with ratings up to 30 kW and 600 volts. 234 Series unit heaters provide heat in non-hazardous environments where moisture and corrosion are present. Standard unit heaters include a heavy duty industrial model, several commercial models, vertical, cabinet and portable designs. A wide range of floor, wall and ceiling heaters, including baseboard heaters and radiant ceiling panels, are available to meet any application requirement. HEATREX also offers the widest selection of built-in controls in the industry.

    Quick DeliveryA wide selection of assembly stock designs with options are available in two weeks. Most comfort heating products will ship in two weeks.

    ColorsMany of HEATREXs comfort heating products are avail-able in a choice of colors. Standard and special colors are shown in the back of this catalog. Custom colors, including bronze or clear anodizing and matches to customer supplied paint samples, are also available on select heaters.

    SafetyHEATREX explosion-proof unit heaters include redun-dant overtemperature protection which exceeds agency requirements. The 233 Series unit heater has the indus-trys lowest Ignition Temperature Code rating, 320F (160C), and is CSA Approved.

    HEATREX corrosion resistant heaters are available with cULus Approvals. Explosion-proof and corrosion resistant heater designs are available for marine and shipboard use that are ABS Approved and meet U.S. Coast Guard require-ments.

    HEATREX commercial and industrial unit heaters are UL and cUL Approved for non-hazardous, non-corrosive environments. Comfort heating products are CSAus or CSA Approved.

    American Bureau of Shipping

  • 4

    IntroductionHazardous locations are those areas where a potential for explosion and fire exists due to the presence of flammable gases, vapors, pulverized dusts or ignitable fibers in the atmo-sphere. Hazardous locations are created from the normal pro-cessing of volatile chemicals, gases, coal, grains, etc., or from the accidental failure of storage systems for these materials.

    Open flames are not permitted in these locations. The use of electric heating equipment is permitted with two major restric-tions: 1) The surface temperature of the equipment cannot exceed the ignition temperature of the hazardous atmosphere and 2) all arc and spark producing devices must be isolated from the atmosphere in an appropriate enclosure.

    Both people and equipment in hazardous locations can be heated safely and economically with electric heat. Electric heating is typically much less expensive to install and maintain than caparable remote oil or gas fired heating systems.

    National Electrical Code ClassificationArticles 500 through 516 of the National Electrical Code deal with the definition of hazardous areas and the use or design of electrical equipment used in these locations. Electric heating equipment for hazardous areas is specified based on the NEC class, division, group and ignition temperature or the alter-nate class and zone classification.

    ClassHazardous locations are divided into the three general classes of vapors/gases, dusts and fibers.

    Class I Locations where the potential for explosion and fire exists due to the presence of flammable gases or vapors in the air. Typical Class I locations include oil or natural gas drilling rigs, petroleum refining or pumping facilities, petro-chemical plants, wastewater/sewage treatment plants, solvent extraction plants, paint spraying booths, locations where open tanks or vats of combustible liquids are present and storage areas for flammable materials.

    Class II Locations where the potential for explosion exists because of finely pulverized flammable dusts suspended in the atmosphere. Typical locations would include coal fired power plants, coal preparation/coal handling facilities, coal mines, grain elevators, flour and feed mills, packaging and han-dling of pulverized sugar and processing and storage of mag-nesium and aluminum powder.

    Class III This third classification is primarily a fire hazard where fibers or flyings suspended in the air create a hazard. This would include small pieces of thread-like fiber, sawdust, lint, etc. Typical applications would include textile mills, wood-working plants, cotton gins, cotton seed mills and flax produc-ing plants.

    DivisionClass I, Class II and Class III areas are further defined in terms of when the hazard occurs. Division 1 and Division 2 occur-rences are summarized below.

    Division 1 If the hazard is expected to be present under normal conditions, such as a production or processing facil-ity, the occurrence is designated Division 1. The hazardous atmosphere may be present continuously, intermittently, peri-odically, or during normal repair or maintenance operations. Division 1 occurrences also include locations where a break-down in the operation of processing equipment results in the release of hazardous vapors.

    Division 2 If the hazardous material is normally expected to be contained within a closed area, system or container, and would enter the ambient atmosphere only under an abnormal failure, then it is referred


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