Water Cooled 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.


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


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.


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


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!


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.

Client Reviews

  • Thank you Coles Refrigeration & Air Conditioning for the professional work you produced in installing the bar and kitchen at the Mark Hotel.

    Your professionalism, quality, honesty, and delivery timeframes were outstanding given you were under an extremely tight schedule to get the project completed. I was especially impressed with your effort to accommodate any additions to the original scope, including the client's request to refurbish the entire kitchen two weeks prior to Christmas. I have no hesitation in recommending you and Coles Refrigeration & Air Conditioning to future clients and trust we will continue to further strengthen the relationship between our companies.

  • Coles have been responsible for the provision, installation and servicing of all our beverage and catering equipment, air conditioning & general refrigeration. I have conducted business with Coles since 1994. I have no hesitation in recommending Coles Refrigeration & Air Conditioning to prospective clients.

  • We were impressed by the excellent sales advise, design, installation and after sales service we received. All equipment restoration was carried out professionally keeping costs to a minimum. Coles Refrigeration & Air Conditioning ensured that our budget was met and that we received the best available equipment within that budget. For future requirement, we will not hesitate to involve Coles Refrigeration & Air Conditioning. Thank you for the professional input and service!

  • Thank you for the excellent work produced by your staff during the fit out of our new kitchen. The stainless steel exhaust and benchwork are second to none. Our cool room, pantry and freezer are working beautifully and the shelving and the layouts are exactly to our requirements. I will always be available to be contacted to recommend the work you and your staff did on our new kitchen.

  • Throughout all the stages of development and construction, I always found the staff from Coles to be highly professional and diligent in their works. Cole's tradesmen who carried out the works at our site were always helpful and met our stringent OH&S requirements. The buildings that were refurbished present various challenges with timeframes and meeting relevant codes and standards. With Cole's help, we were able to meet and exceed all expectations. I have no hesitation in recommending Coles Refrigeration for any future works in which they tender.

  • Mitchel Cousins has presented at two workshops held by the Energy Hunter team, helping businesses gain an understanding of real life ways to improve performance, reliability and cost savings of plant and equipment. Mitchell displayed high level of knowledge in both his specific industry, as well as energy efficiency. It was a pleasure working with Mitchell and I would happily do so again.

  • I was on site this morning at 47 Darby Street for the RMS Fitout project, and the foreman was heaping a fair bit of praise on you guys for the quality and speed of work! Thanks for helping us out on this one.

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