Product Description

INDEECO Ultra-Safe EXP Series — Explosion-Proof Electric Unit Heater

The INDEECO Ultra-Safe EXP Series is a cCSAus-approved, forced-air explosion-proof electric unit heater engineered for the most demanding classified hazardous locations. Available in eight wattage configurations from 3,000W to 30,000W, this series covers everything from small equipment rooms to large industrial bays — all on a single, safe, reliable platform.


Hazardous Location Certifications

  • ✅ Class I, Divisions 1 & 2, Groups C and D

  • ✅ Class II, Divisions 1 & 2, Groups F and G

  • ✅ Class I, Zones 1 & 2, Group IIB

  • ✅ Ignition Temperature Code T3C — 320°F (160°C)

  • ✅ cCSAus Listed


Select Your Model

Use the variant selector above to choose the wattage that matches your heating load. All models run on 480V, 3-Phase, 60 Hz

All models shown run on 480V, 3-Phase, 60 Hz. Also available in 208V, 240V, and 600V in both single and 3-phase configurations — contact us to order.

Model Wattage Amps Frame Size Air Temp Rise Airflow Air Throw Net Weight
233-FA-0036U 3,000W 5A Size 1 15°F (8°C) 650 CFM 15 ft (4.5 m) 110 lbs (50 kg)
233-FA-0056U 5,000W 7A Size 1 25°F (13°C) 650 CFM 15 ft (4.5 m) 110 lbs (50 kg)
233-FA-0086U 7,500W 10A Size 1 28°F (16°C) 850 CFM 25 ft (7.6 m) 110 lbs (50 kg)
233-FA-0106U 10,000W 13A Size 1 38°F (21°C) 850 CFM 25 ft (7.6 m) 110 lbs (50 kg)
233-FB-0156U 15,000W 19A Size 2 27°F (15°C) 1,800 CFM 45 ft (13.7 m) 150 lbs (68 kg)
233-FB-0206U 20,000W 25A Size 2 35°F (19°C) 3,110 CFM 65 ft (19.8 m) 150 lbs (68 kg)
233-FC-0256U 25,000W 31A Size 3 26°F (14°C) 3,850 CFM 75 ft (22.8 m) 190 lbs (86 kg)
233-FC-0306U 30,000W 37A Size 3 25°F (13°C) 3,850 CFM 75 ft (22.8 m) 190 lbs (86 kg)

How It's Built

The Ultra-Safe EXP uses a hermetically sealed liquid-to-air heat exchanger with all-welded steel headers, spiral-wound aluminum fins, and nontoxic inhibited propylene glycol heat transfer fluid — providing freeze protection down to -49°F (-45°C). The NEMA 7/9 cast aluminum explosion-proof control enclosure houses automatic and manual reset thermal cutouts with a 24V control circuit transformer for multi-layer overtemperature protection. The permanently lubricated ball-bearing fan motor is pre-wired to the control enclosure, eliminating separate field motor wiring.


Physical Dimensions by Frame Size

Frame Size Models Width (X) Height (Y) Depth (Z) Shipping Weight
Size 1 3kW – 10kW 22.50 in (572 mm) 19.375 in (492 mm) 16.063 in (408 mm) 130 lbs (59 kg)
Size 2 15kW – 20kW 22.50 in (572 mm) 23.375 in (594 mm) 20.188 in (513 mm) 169 lbs (77 kg)
Size 3 25kW – 30kW 22.75 in (578 mm) 27.375 in (695 mm) 24.188 in (614 mm) 216 lbs (98 kg)

Maximum Mounting Heights

Frame Size Max Height from Floor
Size 1 (233-FA) 9 ft (2.7 m)
Size 2 (233-FB) 10 ft (3.0 m)
Size 3 (233-FC) 13 ft (4.0 m)

Factory Option Upgrades Available

Contact us to configure your unit with any of the following factory-installed options:

  • D — Disconnect switch (meets NEC/CEC disconnecting means requirement)

  • T — Adjustable thermostat 50–90°F (10–32°C), Indoor Type 1

  • T1 — Adjustable thermostat 40–80°F (5–25°C), IP55 Type 4

  • K — Warning pilot light (thermal cutout trip indicator)

  • L — Heater-on pilot light (elements energized indicator)

  • M — Manual reset thermal cutout with backup contactor

  • S — Built-in auto/fan selector switch

  • C1 — 316 Stainless Steel construction (wastewater/corrosive environments)

  • C2 — Dirty Duty Heresite-coated construction (chemical plants)

  • W — Wet location construction, IP55

  • E — Class II, Group E metal dust construction


Compatible Mounting Kits (Sold Separately)

Kit Part Number
Wall Mounting Kit #1022454
Ceiling Mounting Kit #1022451
Pole Mounting Kit #1022457

Ideal Applications

Oil & gas facilities · Chemical processing plants · Grain handling & feed mills · Wastewater treatment facilities · Mining operations · Paint spray booths · Industrial warehouses · Any NEC/CEC-classified hazardous location


Lead Time

8–9 weeks from order (Availability Code AS). Contact us for large quantity lead time confirmation.


⚠️ Installation Notice

This heater must be installed by qualified personnel familiar with NEC/CEC requirements for hazardous locations. Use only explosion-proof wiring methods (mineral insulated cable or rigid conduit with conduit seals). See included installation manual for full requirements.

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