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Coles Marine Grade Chillers

At sea, you can’t afford to go without consistent comfort. You also can’t afford to use large amounts of energy – or a large amount of space – to achieve it. Fortunately, Coles’ chillers have you covered, ensuring the cooling your guests and crew demand, all with maximum reliability and efficiency – and minimum use of valuable onboard space. A marine chiller system, also known as a tempered water system or marine water chiller, is the optimal marine air conditioner for boats larger than 50 feet. Larger boats and yachts greatly benefit from the green, energy-efficient, high-performing, and quiet cooling system.

Getting to Know Your Marine Chiller System

A marine chiller system consists of:

  • Chiller
  • Air handlers installed throughout the vessel
  • Freshwater piping (or water hoses) connecting the chiller to the air handlers
  • Seawater system

The chiller consists of typical AC components: the compressor, condenser, and evaporator. The chiller is charged with R-410A, an environmentally safe refrigerant, that circulates throughout these components.

The air handlers consist of a blower and a coil. Freshwater circulates back and forth between the chiller and the air handlers through insulated piping or water hoses.


When cooling, warm cabin air is drawn (or blown) across the air handler coil by the blower. Heat is removed from the room as it passes through the coil, and then cool air is blown back in. The heat drawn from the room is then transferred to the freshwater, and carried by the piping back to the chiller.

The water then circulates through the chiller, where the heat is transferred to the the refrigerant in the evaporator, cooling the water again. The heated refrigerant is compressed in the compressor, and then circulated through the outer tube in the chiller’s condenser coil.

Seawater circulates through the condenser via the seawater system. The heat transfers from the “heated” refrigerant, to the seawater, and pumped overboard along with all the original hot cabin air.

water cooled dx systems

Water Cooled DX Systems

These systems are the same as a standard DX type system but instead of having an outdoor condensing unit to dissipate the heat outside there is a small heat exchanger (water cooled condenser ) generally under the compressor which dissipates the heat into the water and then pumped out.

Chilled Water Systems

It cools water to between 4.4 and 7.2 degrees Celsius. The chilled water is then piped throughout the ship and connected to air handlers. This can be a versatile system where the water pipes work like the evaporator coils in a standard air conditioner. If it’s well-insulated, there’s no practical distance limitation to the length of a chilled-water pipe.

19XRE AquaEdge Two-Stage Centrifugal Chiller

Advantages of Marine Chiller Systems

Marine water chilled AC systems are considered the top of the line for boating AC systems. This is for several reasons:

  • Maximum performance and durability
  • Customization of AC system to your vessel’s specific cooling needs
  • Highly efficient – lower electricity consumption and a reduced peak electrical load
  • Very environmentally friendly
  • Each air handler can be turned off without turning off the system
  • No limitation of handlers in a system, or distance to each handler
  • Also, while an individual marine chiller can go up to 120,000 BTU/hr (10 tons), several units can be used together in order to provide even higher loads!

Get in Touch with Coles Today

Over the past 73+ years Coles Refrigeration and Air-Conditioning have maintained their reputation as Newcastle’s leading air-conditioning and refrigeration company by ensuring their staff have the products, knowledge, expertise and experience to create efficient and reliable air-conditioning systems tailored to your specific requirements.

Contacting Coles refrigeration and Air-conditioning to organise a consultation with a sales engineer will ensure your system is able to meet all of your requirements in the most practical and efficient way.  This process is obligation free, free of charge and will provide you with not only a detailed quote but also honest valuable advice from recognised air-conditioning experts with decades of experience.