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  • Explosion-Proof Unit Heater
  • Overview
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  1. Home
  3. Commercial Heating Products
  5. Explosion-Proof & Water Resistant
  7. Explosion-Proof Unit Heater

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Explosion-Proof Unit Heater

A safe way to heat

The explosion-proof unit heater from Stelpro’s X-PRO series is the proven choice for hazardous locations at risk of fire or explosion due to the presence of flammable and hazardous substances. Available with an array of characteristics and options, this explosionproof unit heater is designed with both safety and versatility in mind.

Please note that as of September 1, 2026, explosion-proof series units will no longer be manufactured with a red casing. They will now be offered exclusively in yellow.

Use cases

  • Interior use

Characteristics

ADVANTAGES
  • Stainless steel burst disc pressure relief device — Leak-free under normal operating conditions for added reliability
  • Heating element delivers up to 45% higher temperature rise compared to competitors — Maximized performance for demanding environments
  • Low-voltage wall-mounted electronic thermostat — Safer and more precise temperature control
  • Optional corrosion-resistant Heresite coating — Added protection in harsh or humid environments
  • Durable, easy-to-open packaging for jobsite use — Ensures the unit is functional and ready to install—every time
COLOR
  • Standard: yellow
FINISH
  • Standard : epoxy/polyester powder paint
VOLTAGE
  • 208V, 240V, 480V, 600V, 1 or 3 phase
MANUFACTURING
  • 14-gauge steel cabinet
  • Adjustable anodized aluminum louvers
  • Cast aluminum control and element enclosure lids NEMA Type 7 and 9 with O-ring
  • Fan Guard: multiple horizontal stiffening wires
  • Stainless steel high temperature pressure relief device
  • Two high-limit temperature controls : one with automatic reset and one with manual reset
MOTOR
  • Explosion-proof, thermally protected, permanently lubricated ball bearing motor
  • 3 to 20 kW : 1/4 HP, 1725 rpm
  • 25 to 35 kW : 1/2 HP, 1725 rpm
TEMPERATURE CODE
  • Division System : 5 to 30 kW = T3B 165°C (329°F), 3 kW/35 kW = T3A 180°C (356°F)
  • Zone System : T3 200°C (392°F)
TEMPERATURE LIMITATIONS
  • Ambient temperature : -40°C to 40°C (-40°F to 104°F)
  • Maximum altitude : 3048 m (10 000 ft.) above sea level
HEAT EXCHANGER
  • High grade metal-sheathed elements fins with ethylene glycol/water solution
  • Long-life, low watt density
  • Evacuated and sealed, carbon steel tube core with 10 aluminum fins per inch
CONTROL
  • Control circuit 120 VAC or 24 VAC (required for use with electronic thermostat)
  • Optional built-in or wall thermostat (bi-metal or electronic)
  • Optional built-in or wall disconnect switch
INSTALLATION
  • Wall, ceiling or pole installation using mounting brackets (not included; see the accessories table)
WARRANTY
  • Three years

Documents

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Specsheet

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Technical drawings

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User guide

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Shop drawings

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Specifications

Accessories