WALTER  Keel  Coolers

For over 70 years, Walter Keel Coolers have proven to be the most dependable, trouble-free and economical form of marine engine cooling.  Their rugged design and longevity are demonstrated by decades of  service on US Navy vessels, US Coast Guard vessels, workboats, fishing boats, ferry boats, tug boats and pleasure yachts throughout the world.















Proper engine cooling protects your engine investment and allows the engine to run more efficiently:


3 Models and Hundreds of Sizes IN STOCK

Walter Keel Coolers are available in 3 models & hundreds of sizes to suit every application from 10 horsepower auxiliary engines to 5,000+ horsepower propulsion engines.  

End Model, Double Stem Model and Center Models to fit every hull.



 End Models 

Unique design with only one thru-hull fitting, WALTER "End Model" Keel Coolers make installation fast and inexpensive while greatly reducing inboard plumbing.  It's no surprise that boatbuilders and marinas prefer WALTER "End Model" Keel Coolers.

The single thru-hull fitting, located at only one end of the cooler, contains both the inlet and the outlet water connections.   Available in 2, 4, 8, 12 and 16 tube configurations; the 12 and 16 tube coolers consist of a "double stack" to provide the maximum amount of cooling in the shortest assembly possible.







 Double Stem Models 

The most economical Walter Keel Cooler, "Double Stem" Models have one thru-hull fitting at each end of the keel cooler.  The thru-hull fittings feature standard male pipe threads equal to the keel cooler size number for easy connection with standard pipe fittings.

Available in 4, 6, 8, 12 and 16 tube configurations;  the 12 and 16 tube coolers consist of a "double stack" to provide the maximum amount of heat exchange in the shortest and most compact assembly possible.






Walter Turbo Tube - Maximum Heat Exchange and Strength

PREMIUM Walter Turbo Tube is made of CUPRONICKEL for the perfect combination of:

Turbo Tube features spiral grooves on the outer wall and ridges on the inner wall to continually propel and swirl the coolant against the inside tube wall where the heat exchange takes place.  

The unique TURBO or turbulating action of Walter Turbo Tube exchanges much more heat than smooth rectangular or round tubes in which most of the coolant flows through the center of the tube, only occasionally  contacting the tube wall.  

Because Walter Turbo Tube provides so much more heat exchange, a more compact and inexpensive Walter Keel Cooler can be used.




Streamlined and Foul-Proof Design

Walter Keel Coolers are streamlined, unlike boxy rectangular-type coolers which create drag.  In comparison, streamlined Walter Keel Coolers can be mounted flush with the hull and do not need to be recessed, greatly simplifying installation time and expense.  

Due to the space between the hull and the round tube surface, seawater circulates between the round tubes, continuously washing debris from the cooling surfaces -- unlike rectangular tubes which can become clogged with mud and  debris.


Demountable Design

The unique DEMOUNTABLE design allows Walter Keel Coolers to be quickly removed for hull maintenance without disturbing the inboard plumbing (the thru-hull fitting can be left in place on the hull).   In an emergency, the demountable design allows the Walter Keel Cooler to be removed with the vessel in the water, should a drydock be unavailable.


No Brazed Joints to Crack and Leak

Walter Keel Coolers are engineered with FLEXIBLE double o-ring aircraft-type pressure seals which have proven reliable for decades in tens of thousands of installations, including US Coast Guard  and US Navy vessels.  This flexible design eliminates the problem of brazed joints cracking in heavy seas as the hull flexes or during a hull impact (as with a tug boat or pushboat).   Walter Turbo Tubes can accommodate moderate hull curvatures.


Computer-Aided Engineering

Computer-aided custom recommendations combined with over 70 years of EXPERIENCE ensures an accurate keel cooler sizing based on the specific operating characteristics of your engine and vessel.  Walter Keel Coolers have proven RELIABLE on all types of vessels including US Coast Guard vessels, US Navy vessels, commercial fishing boats, tugboats, pushboats, large pleasure yachts, and even small sailboats.


Computerized Machining and Old World Craftsmanship

The Walter Machine Company combines 90+ years of old-world craftsmanship with the most advanced computerized (CNC) machining in the manufacture of each Walter Keel Cooler. 

Precision components combined with a superior design results in long term reliability you can count on.







In Stock for Immediate Shipment

Walter Machine stocks hundreds of keel coolers, most available for IMMEDIATE SHIPMENT.




For a FREE quotation please fill out  "Request for Keel Cooler Sizing" 

and email

or fax 201-656-0318


 Request for Keel Cooler Sizing 

 Keel Cooler Parts Diagram (pdf) 

 Keel Cooler Zinc Anode Chart (pdf) 

 Keel Cooler Cleaning Suggestions (pdf) 



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