The GRIDCOOLER® Keel Cooler is a completely assembled unit and is factory tested to ensure dependability. 

The rectangular shaped tubing used in its construction is structurally sound and provides a higher heat transfer rate than round tubing.

90/10 Copper-Nickel

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Available in 3 sizes

The copper-nickel GRIDCOOLER Keel Cooler is crafted using heavy walled rectangular 90/10 copper-nickel tubing.  

This alloy was selected based on its durability, heat exchange abilities, resistance to saltwater corrosion, and natural antifouling capabilities.

Enhanced & Smooth Interior Walled Tubing

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Glatte eller bearbejdede indvendige overflader

Fernstrum offers two types of surfaces on the interior of the copper nickel tubing, smooth or enhanced. 

The enhanced surface, a Fernstrum exclusive, is a truncated cone pattern on the interior of the tube generating greater heat transfer.

Compared to a smooth walled tube, the enhanced tube increases the heat transfer capability by up to 30 percent. 

This is especially true in applications where glycol solutions are utilized. The improvement in efficiency may reduce the number or size of the units required for an application. Note: The interior surface of the tubing is determined based on your cooling requirements.

Silver Braze Wire

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Each copper-nickel keel cooler is torch brazed with 56% silver (content) braze wire to maximize the flexibility and durability of the unit. 

The higher silver content offers superior corrosion resistance, improving the dependability of the keel cooler and its ability to withstand harsher operating conditions. 

Critical braze joints are ultrasonically tested as an added measure to ensure the unit’s reliability.

All brazes are pressure and ultrasonically tested.

5000 Series Aluminum

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Aluminium kølkøler

The aluminum GRIDCOOLER Keel Cooler is designed specifically for unpainted aluminum hull applications in fresh or cold seawater environments. 

unpainted aluminum hull applications in fresh or cold seawater environments. 5000 series aluminum alloy was selected based on its compatibility with unpainted aluminum hulls and saltwater corrosion resistance. 

The alloy compatibility between the hull and keel cooler prevents pitting and avoids potential damage from interacting metals 

Aluminum units are tig welded for durability