R.W. Fernstrum & Company has been engineering and manufacturing GRIDCOOLER® Keel Coolers for the marine industry since 1949. Each cooling solution is engineered to meet the requirements of your engine, vessel, and operating conditions. Our commitment to quality means you get a reliable, long-lasting cooling system from Fernstrum®, the pioneer of the rectangular tube keel cooler.


The GRIDCOOLER Keel Cooler has continually evolved to meet the performance expectations of naval architects and the marine industry worldwide. Our team of craftsmen employ the latest technologies to maximize our manufacturing process. The result is a custom-designed GRIDCOOLER Keel Cooler that performs as expected, meeting your needs.