French Flag Icon


R.W. Fernstrum & Company is a third generation family owned business with a reputation for outstanding quality and customer service. The company is a global leader in the engineering, development and manufacturing of cooling technologies for the marine industry. R.W. Fernstrum offers 3 product lines, covering the complete range of cooling options for marine applications.

These product groups are; the FERNSTRUM® GRIDCOOLER® keel cooler, the WEKA-Fernstrum Boxcooler and the Tranter-Fernstrum Plate Heat Exchangers. Each of these product groups are recognized for their excellence, quality and the superior value they offer to the marine industry.



The FERNSTRUM® GRIDCOOLER® keel cooler is a closed circuit cooling unit mounted on a vessel's hull beneath the waterline. It eliminates the need for an inboard heat exchanger, raw water pumps and strainers, as well as the maintenance associated with them. The FERNSTRUM® GRIDCOOLER® is manufactured with 90/10 copper nickel, a material offering a long service life and anti-fouling properties.

Download PDF Brochure

WEKA-Fernstrum Boxcooler

The WEKA-Fernstrum Boxcooler is a closed circuit cooling system, mounted in a sea chest. It comes with the Protector Type S system which protects the cooler from potential damage from stray electrical currents and allows the 90/10 copper/nickel tubes to maintain their natural anti-fouling capabilities. There is no need for an ICAF system when using the WEKA-Fernstrum Boxcooler.

Download PDF Brochure


With Tranter, Fernstrum now offers you the very best in reliable, compact and efficient Plate Heat Exchangers. They can be found on board of countless vessels all around the world - from luxury yachts to huge container vessels, supertankers and offshore rigs.

Download PDF Brochure