Onan Heat Exchangers

An Onan heat exchanger transfers excess heat from a generator's coolant or oil system to raw water or air, keeping engine temperatures within safe operating limits. This prevents overheating, protects internal components, and helps maintain consistent power output during continuous-duty operation in industrial and power generation applications.

Common warning signs include rising coolant temperatures, visible corrosion or leaks on the exchanger housing, reduced cooling efficiency, and unexpected generator shutdowns due to overheating. Regular inspection of end caps, tubes, and seals helps catch failures early before they cause costly downtime or engine damage.

Quality aftermarket heat exchangers, like our ICEBOX replacement parts, are manufactured to OEM-equivalent specifications for fit, material, and performance. They undergo testing to match original tube configurations and pressure ratings, offering a reliable and often more cost-effective alternative to factory parts.

Most heat exchangers use copper or cupro-nickel tubes for corrosion resistance, paired with brass or bronze end caps and shells. These materials handle both fresh water and raw water cooling systems while resisting scaling and corrosion common in continuous-duty generator applications.

Yes, heat exchangers are typically matched to specific generator models and cooling system configurations based on tube count, core dimensions, and pressure rating. Provide your generator's model and serial number so we can verify compatibility before ordering a replacement unit.

Service life varies with water quality, operating hours, and maintenance, but most heat exchangers last several years under normal conditions. Using treated coolant, flushing raw water sides periodically, and replacing zinc anodes when applicable can significantly extend the unit's operational lifespan.

You'll need your generator model and serial number, the original part number if available, core dimensions, and cooling system type such as fresh water or raw water. Providing this information ensures you receive a heat exchanger that matches your equipment's exact specifications.