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Hazardous Location Air-to-Water Heat Exchangers for Electrical Enclosures

The hazardous location air-to-water heat exchangers listed above are certified for Class I Division 2 and ATEX environments, providing closed-loop enclosure cooling where cooling water is available and ambient temperatures may exceed the desired cabinet temperature.

Every hazloc unit carries UL, CSA, ATEX, or IECEx certification depending on the model, in NEMA 4 and NEMA 4X enclosure ratings. NEMA 4X adds the corrosion resistance required in chemical plants and offshore installations. Confirm the class, division, or zone your site classification requires before selecting a unit.

Choose a water-cooled unit over an air-to-air heat exchanger when ambient air is too warm to achieve the needed delta-T. This is common in refineries, chemical plants, and offshore platforms where process cooling water is already part of the infrastructure. For general-purpose environments without a hazardous classification, see the UL certified air-to-water units.

These flush-mount, closed-loop units are manufactured by Noren Industrial Thermal Management. For a broader overview of the technology, visit our Noren heat exchangers page.

Browse Available Hazardous Location Air-to-Water Heat Exchangers

The following Noren models are available through Pelmar Engineering. Available products include:

Selecting the appropriate model depends on heat load (BTU/H), available water supply temperature, and enclosure dimensions. Each product page provides the detailed specifications needed for sizing and system design.

When to Specify Air-to-Water Cooling in Classified Areas

Water-cooled enclosure coolers solve a specific problem in hazardous areas: holding cabinet temperature when the surrounding air is hotter than the electronics can tolerate. Because the cooling water supply, not ambient air, absorbs the heat, an air-to-water heat exchanger can maintain internal temperatures at or below ambient while the closed loop keeps flammable gases and contaminants out of the enclosure.

These water-cooled enclosure coolers are commonly specified for:

  • Oil and gas processing facilities and refineries
  • Chemical and petrochemical plants
  • Offshore platforms with seawater or process cooling loops
  • Large manufacturing operations with central cooling water systems

Want to Learn More?

Need Assistance Selecting a Hazardous Location Heat Exchanger?

Pelmar Engineering works with engineers, maintenance managers, and procurement teams across Canada to match air-to-water heat exchangers to site classifications and heat loads. Contact us at 1-888-754-6329 or Email: info@pelmareng.com.

Common Questions About Hazardous Location Air-to-Water Heat Exchangers

Air-to-air heat exchangers reject cabinet heat into the surrounding ambient air through a closed loop, while air-to-water units reject it into a cooling-water supply. Because water absorbs the heat instead of ambient air, an air-to-water heat exchanger can hold the enclosure below ambient temperature, which is required in hot environments or when tight temperature control is needed. Browse air-to-air hazardous location models if ambient air at your site is cooler than your target cabinet temperature.

Class I Division 1 areas have flammable gases or vapours present under normal operation, while Division 2 areas only have them present under abnormal conditions, such as a leak or equipment failure. These Noren air-to-water heat exchangers are certified for Class I Division 2 (and ATEX Zone 2) locations — they are not Division 1 or “explosion-proof” units. Confirm your area classification with your site’s electrical drawings before selecting a unit.

Yes. These Noren air-to-water heat exchangers carry UL, CSA, ATEX, or IECEx certification depending on the model, covering Class I Division 2 and ATEX Zone 1 / Zone 2 environments. Certification varies by model, so confirm the specific class, division, or zone your site classification requires before selecting a unit.

Models are available in NEMA 4 and NEMA 4X. NEMA 4 provides protection against dust and water, while NEMA 4X adds the corrosion resistance required in chemical plants, food processing, offshore platforms, and other washdown or corrosive environments.

Sizing depends on five inputs: your heat load in BTU/H, ambient temperature, desired internal enclosure temperature, available water-supply temperature, and enclosure dimensions. The available water temperature is critical, since a colder supply achieves a greater delta-T and removes more heat. Each product page lists the detailed specifications needed for sizing, and Pelmar Engineering can match a model to your figures, contact us with those five values.

Yes, these units require a water-supply connection. They are commonly installed in facilities where process cooling water is already available, such as refineries, chemical plants, offshore platforms, and large manufacturing operations. If your site has no cooling-water supply and ambient air is cool enough, an air-to-air unit may be a better fit. For general-purpose environments without a hazardous classification, see the UL certified air-to-water units.

Yes. NEMA 4X models provide the corrosion resistance needed for offshore and marine environments and can be supplied by seawater or a process cooling loop. Because the closed-loop design keeps flammable gases and contaminants out of the enclosure, these units are well suited to offshore oil and gas platforms operating in Class I Division 2 areas.

Yes. Contact Pelmar Engineering at 1-888-754-6329 or info@pelmareng.com with your heat load (BTU/H), ambient temperature, desired internal temperature, available water-supply temperature, and enclosure dimensions, and our team will match an air-to-water heat exchanger to your site classification and heat load.