236 Series Compact Explosion-Proof Unit Heater

Heatrex’s Compact explosion-proof unit heater is designed with both size and economy in mind.

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Standard Features

Compact Size
This small design is only 13 inches wide, which makes it ideal for applications where limited space is available.

Low Cost
The Compact design offers the most economical solution for heating small Class I, Group D hazardous areas. It is a cost effective alternative to the use of explosion-proof convection heaters.

Redundant Over Temperature Protection
Primary and secondary automatic reset thermal cutouts for additional safety.

Stainless Steel Construction
Provides superior corrosion resistant protection. Optional Dirty Duty construction adds epoxy coating to all aluminum parts for use in corrosive applications.

Optional Marine Duty Construction
The 236 Series design is ideal for shipboard use where size, weight and corrosion resistant construction are critical.

Construction Features

Heating Elements
Industrial grade, Type 304 stainless steel finned tubular heating elements.

Terminal Enclosure
A NEMA 7, 9 cast aluminum enclosure with a threaded bottom cover permits easy access to the built-in controls from underneath the heater.

Round, 16-gauge stainless steel shroud.

An adjustable stainless steel louvered outlet grille directs airflow 45° up or down and a heavy gauge zinc-plated rear grille protects against accidental contact with the fan blade.

Stainless Steel Swivel Mounting Bracket
Supplied as standard with all 236 Series compact explosion-proof unit heaters. This multi-purpose bracket can be used for either wall or ceiling mounting.

Built-In Controls
Include primary and secondary automatic reset over temperature cutouts, controlling and backup contactors (as required), and a time delay relay which keeps the fan running to cool the heating elements after they have been de-energized.

Fan Motor Assembly
Consists of a 120-volt/1-phase/ 60 Hertz motor fitted with an aluminum fan blade. The totally enclosed motor is UL Listed for Class I, Group D applications and includes permanently lubricated ball bearings and built-in thermal overload protection. The motor is factory wired into the enclosure to reduce field wiring, but requires a separate 120-volt power supply.


Chemical Storage/Handling Areas
Compressor Stations
Marine and Offshore
Oil Platforms and Refineries
Sewage/Wastewater Treatment Plants
Spray Booths


Class I, Divisions 1 and 2, Group D
Class I, Zones 1 and 2, Group IIA

Closed Tank Heating

Watt Density

Percentage of Wattage

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