Engine Room Parts
Heat Exchange, Cooling & HVAC
OEM heat exchangers, coolers, anodes, thermostats, and chiller systems for marine engines
Request QuoteEfficient Heat Management for Marine Systems
Heat exchangers and cooling systems regulate engine temperature, extending service life and preventing thermal damage. Mercer Yachting supplies OEM-specification plate heat exchangers, oil coolers, fresh water and seawater coolers, protective anodes, and thermostats. We also source chiller spares and system components. Each component is rated for marine service, supporting superyachts, cruise ships, and commercial vessels with reliable thermal management.
What We Supply
Plate Heat Exchangers
Brazed aluminum and stainless steel plates for engine jacket water, oil, and fuel cooling
Oil Coolers
Main engine and auxiliary lube oil cooler units with marine coatings
Seawater & Fresh Water Coolers
Raw water intake coolers and keel coolers for passive cooling systems
Protective Anodes
Zinc and aluminum anodes for cathodic protection of heat exchanger internals
Thermostats & Valves
Engine coolant thermostats and mixing valves for temperature control
Chiller & HVAC Spares
Refrigeration system components and accommodation cooling parts
Cooler Gaskets & Seals
Replacement gasket plates and sealing kits for heat exchangers
Cooler Maintenance Kits
Complete spares packages for cooler overhaul and scheduled service
How to Specify
Provide These Details
- Heat exchanger model and serial number or OEM part number
- Plate count and gasket material compatibility
- Flow capacity (GPM/LPM) and heat rejection (kW)
- Fluid types (engine oil, fresh water, seawater) and coolant chemistry
- Pressure and temperature ratings
- Connection port sizes and thread types
Common RFQs We Handle
Plate Heat Exchanger 20 Plates
Engine jacket water to fresh water cooling unit
Oil Cooler Caterpillar CAT
Main engine lube oil cooling cartridge
Zinc Anode Heat Exchanger
Protective sacrificial anode plate assembly
Thermostat Engine Coolant
Temperature regulating valve for diesel engine
Seawater Cooler Keel
Passive keel-cooler unit for auxiliary systems
Gasket Kit Heat Exchanger
Complete replacement gasket set for plate cooler
Chiller Compressor Unit
Refrigeration compressor for cabin air conditioning
Cooler Mixing Valve
Temperature control three-way mixing valve
Heat Exchanger Overhaul Kit
Complete spares for plate exchanger maintenance
Aluminum Protective Anode
Galvanic protection plate for seawater applications
Raw Water Strainer Cooling
Intake strainer protecting cooler circuits
Engine Bypass Thermostat
Quick warm-up bypass thermostat assembly
Fresh Water Cooler Unit
Closed-loop fresh water heat exchanger for auxiliary
Cooler Connection Hose Kit
Stainless clamps and pressure-rated hose fittings
Maintenance Contract Cooler Service
Annual inspection, cleaning, and certification service
Frequently Asked Questions
What is a brazed aluminum heat exchanger and why is it preferred?
Brazed aluminum plates are bonded with copper braze, creating a compact, efficient core with high heat transfer. They're lighter than stainless steel and ideal for marine service where weight matters. Brazed aluminum is standard for most OEM applications.
What is the purpose of a zinc anode in a heat exchanger?
Zinc anodes provide cathodic protection, sacrificing themselves instead of the copper-nickel tubes inside. Seawater systems require anodes to prevent corrosion and ensure cooler life. Replace anodes annually if heavily used or when 50% eroded.
How often should heat exchangers be cleaned?
Cleanings depend on service conditions. Seawater coolers benefit from annual cleaning and biofouling prevention chemical treatments. Closed-loop systems (engine jacket water) require cleaning every 2-3 years or if pressure drop increases 15%.
What is the difference between a plate and tube heat exchanger?
Plate exchangers use thin stacked plates for compact, efficient design. Tube exchangers use shell-and-tube construction, larger and heavier. Plates are standard on modern yachts; tubes are legacy or for extreme pressure applications.
Can I use fresh water coolers instead of seawater coolers?
Yes, closed-loop fresh water systems eliminate seawater corrosion and biofouling risks. They require a larger primary seawater cooler but reduce maintenance. Many modern superyachts use this indirect two-stage cooling approach.
What is a thermostat bypass and when is it used?
A bypass thermostat allows coolant to recirculate within the engine without cooling during warm-up, reaching operating temperature faster. This reduces cold-start wear and improves fuel economy. Most marine diesels use bypass thermostats.
How do I know if my heat exchanger needs cleaning?
Signs include rising engine temperatures, reduced cooling effectiveness, higher pressure drop across the cooler, or visible biofouling/scale. Pressure gauges on inlet/outlet lines indicate fouling if differential pressure exceeds normal operating range.
What is the typical life span of a marine heat exchanger?
Well-maintained brazed aluminum exchangers last 10-15 years. Seawater coolers last 8-12 years depending on water quality and biofouling activity. Replace gaskets every 5 years and anodes annually to maximize cooler life.
Delivery Footprint
Mercer Yachting delivers across the Mediterranean — Malta, Antibes, Palma de Mallorca, Barcelona, Genoa, Athens, Split — and worldwide via our global logistics network. Emergency parts dispatched same-day from our Malta hub.
Ready to Order Cooling Components?
Our marine engineers can source OEM heat exchangers, coolers, and chiller spares for any vessel. Contact us with model details, flow requirements, and cooling system specifications for a rapid quote.