E-Series™ GRIDCOOLER keel coolers have zinc anodes mounted at each end of the unit. This modification is available upon request at no additional charge and works well for fishing vessels where entanglement of nets is a concern.

L-Series™ GRIDCOOLER keel coolers (shown here in multi-pass configuration) with extended support plates reduce the number of hull penetrations needed for installation.

Z-Series™ GRIDCOOLER keel coolers have low-profile flange connection with all mounting hardware and mating flanges included. Custom insulators provide isolation from the hull, if desired. This design eases installation on double hulled vessels and may eliminate the need for cofferdams.

Angled Tube GRIDCOOLER keel coolers offer an efficient keel cooling option for stationary vessels. While most keel coolers are designed to transfer heat to the slipstream current of the sea water while underway, the angled tube GRIDCOOLER keel cooler is designed to take advantage of the buoyancy driven flow of sea water created through mixed convection while the vessel is at rest.

Enhanced GRIDCOOLER keel coolers offer heat transfer improvements of as much as 30% over a smooth wall tube. This technological innovation, exclusive to Fernstrum®, offers increased internal surface area while disrupting the boundary layer by imparting turbulent coolant flow.