A reliable boat fridge can change the whole onboard experience. Cold drinks. Fresh food. Less waste. Fewer worries when you are away from shore.
But choosing the right refrigeration system is not always straightforward. Not every fridge for a boat is the same, and the best solution depends on the size of your insulated box, how you use it, and whether you need cooling, freezing, or both.
Dometic’s latest Cold Machine series has been designed to make that decision easier, with two clear routes: the all-in-one CSX Series and the modular CX + VX Series. Together, they cover cooling applications from 50 to 400 litres, plus freezer options for selected setups. For more specialised high-capacity applications up to 600 litres, the range also extends to larger custom solutions such as the CX600 for premium fish box installations.
The CSX range is a self-contained, drop-in solution, while CX + VX offers a more configurable system with separate condensing units and evaporators.
Need help choosing the right system for your boat?
What is a Cold Machine?
A Cold Machine is the cooling system behind a built-in fridge or freezer box onboard. Instead of using a freestanding fridge, many boats rely on insulated compartments built into the galley, cockpit, or seating area. The Cold Machine provides the components that cool that space.
That means your starting point is not simply the product. It is the box itself.
Start with these three questions
1. How big is your storage space?
This is the most important factor. Dometic’s Cold Machine range covers:
CSX200: 60 - 200 L
CSX400: 250 - 400 L
CSX150FZ: 60 - 150 L for deep freezing
The modular CX + VX range covers cooling boxes from 50 to 400 L, depending on the condensing unit and evaporator pairing.
2. Do you need cooling or freezing?
Some boat owners simply want dependable refrigeration for drinks, food, and short trips. Others need a boat fridge freezer setup for longer cruising, fishing, or storing frozen provisions properly.
If you only need refrigeration, your selection is often simpler. If you need freezing performance, you need to make sure the system is sized correctly for that job.
3. How good is your insulation?
The same system can support different box volumes depending on insulation thickness. Dometic’s CX + VX data shows that capacities increase significantly with better PU insulation. In simple terms: better insulation helps your fridge cool faster, hold temperature more effectively, and use less power.
When CSX is the right choice
If you want the simplest upgrade path, CSX is the strongest option.
The Dometic CSX is a self-contained cooling system with compressor and evaporator built into one compact unit. It is designed for easy drop-in installation, with no remote couplings required. It also includes fan-assisted airflow, precise digital temperature control, built-in LED lighting, and low-GWP refrigerant.
CSX is a good fit when:
You want a straightforward replacement for an older system
Your box size falls neatly into the CSX capacity range
Space is tight
You want a clean all-in-one installation
It is also worth noting that the CSX Series has already earned major industry recognition, including the DAME Design Award 2025 Category Winner and the IBEX 2025 Innovation Award.
When CX + VX is the better fit
If your installation is less straightforward, CX + VX gives you more flexibility.
In this modular setup, the CX condensing unit is installed separately from the VX evaporator, allowing you to tailor the system to the compartment shape, available space, and onboard use. The CX range includes three condensing units:
CX100: up to 100 L
CX250: up to 250 L
CX400: up to 400 L
You can then match these with different evaporator types, including:
Flat roll-bond evaporators
O-box evaporators
Fan-cooled evaporators
Freezer variants
CX + VX is the better route when:
Your box has an unusual shape
You want more installation freedom
You need a specific evaporator style
You are fitting out a more bespoke refrigeration setup
So, if you are searching for a 12/24v boat fridge or a more tailored fridge / freezer solution for boats, this is often where the modular route makes more sense.
A simple way to choose
Keep it practical:
Choose CSX if:
You want an integrated, easier-to-select, easier-to-install solution.
CSX = all-in-one simplicity
Choose CX + VX if:
You want more flexibility to match the system to your box and installation layout.
CX + VX = modular flexibility
CX+VX SELECTION GUIDE
Why this matters onboard
The best marine refrigeration does more than cool. It helps your boat work better day to day.
A well-matched system means:
Less wasted energy
Faster cool-down
More stable temperatures
Better use of onboard space
Better confidence when cruising longer or farther
That is the real value of the new Cold Machine range. It makes it easier to choose the right system, rather than just the biggest one.
Need cooling for a larger custom fish box?
Dometic’s upcoming CX600 extends the Cold Machine range into larger custom fish box cooling. To match these high-capacity compartments, Dometic also produces tailor-made stainless steel evaporator plates and copper-coil wrapped fish boxes for OEMs and custom boat builders, creating a more purpose-built solution for premium custom installations.
Ready to upgrade your boat fridge?
Whether you are replacing an ageing unit or planning a new installation, the smarter choice starts with your box size, your insulation, and how you use your boat.
Explore the new Dometic Cold Machine range and find the right fit for your onboard cooling needs.