We've been running a Dometic CFX5 75DZ on our boat for three years now. It supplements our built-in fridge and freezer, and it's been one of the most reliable pieces of gear aboard. Here's the honest review after thousands of hours of use.
What It Is
The CFX5 75DZ is a 75-liter dual-zone portable fridge/freezer. "Dual zone" means the cooler is split into two separate compartments, each with its own temperature control. You can run one side as a fridge and the other as a freezer, or both as fridge, or both as freezer — whatever you need.
It runs on basically anything: 12V DC, 24V DC, 110V AC, or 240V AC. Plug it into your boat's 12V system, your RV's cigarette lighter, shore power, or a generator. It doesn't care.
What We Love
It Just Works
Three years. Multiple countries. Rough seas, tropical heat, power outages. The Dometic has never failed. Plug it in, set the temperature, forget about it. That's exactly what you want from a fridge on a boat.
Dual Zone Temperature Control
Each side has its own temperature setting, controlled from a small screen on the top of the unit. Set one side to 37°F for drinks and produce, set the other to -4°F for freezer. The controls are simple — two buttons per side, display shows set temp and actual temp. No phone required.
We keep the smaller side as a freezer and the larger side as a fridge. Ice cream goes under the freezer basket. The baskets are genuinely useful — especially on the freezer side where everything would otherwise become one frozen mass at the bottom.
Power Flexibility
12V DC on the boat. 110V AC when we're at a marina or have the generator running. We've never had a situation where we couldn't power it. The built-in battery protection system prevents it from killing your house battery — you can set the cutoff voltage so it shuts off before draining your bank too low.
Build Quality
The VMSO3 compressor is solid. The insulation holds temperature well — during power outages, the freezer side stays frozen for hours. The hinges, the drain plug, the handles — everything feels like it was designed by people who actually use these things on boats and in overlanding rigs.
What We Don't Love
The Latch
Our latch broke after about two years. After looking around online, this is common enough that someone designed a 3D printed replacement with reinforced gussets where the OEM part fails. We ended up finding a reasonably priced OEM replacement and it was an easy swap — just a few screws. But a $900 cooler shouldn't have a latch that breaks.
The Bluetooth / App
It has Bluetooth. There's an app. In three years, I've never really needed to connect to it. The app tends to not work if you haven't used it in a while — needs an update, won't pair, the usual Bluetooth nonsense. The small screen on the unit itself tells you everything you need to know: set temp, actual temp, and buttons to adjust. Skip the app.
Weight
75 liters of cooler plus a compressor is heavy. Empty, it's about 55 pounds. Full of food and drinks, you're looking at 90+ pounds. Not something you casually move around. Pick a spot for it and leave it there.
Price
The CFX5 75DZ runs around $900. That's a lot for a cooler. But compared to a built-in marine fridge of equivalent capacity, it's actually reasonable. And you can take it off the boat and use it in the truck, at a tailgate, or at a rental house. Try doing that with a built-in unit.
CFX5 vs CFX3 — What's the Difference?
Dometic recently replaced the CFX3 line with the CFX5. The key differences:
| Feature | CFX3 75DZ | CFX5 75DZ |
|---|---|---|
| Compressor | VMSO3 | VMSO3 (same) |
| Capacity | 75L | 75L |
| Weight | ~55 lbs | ~55 lbs |
| WiFi | No | Optional (some models) |
| Ice Maker | No | Available on some models |
| Build | ExoFrame | Updated ExoFrame |
If you find a CFX3 75DZ on sale or used, it's essentially the same cooler. Don't pay a premium for the CFX5 unless you want the ice maker option.
Who Should Buy This
Buy it if:
- You need supplemental cold storage on a boat or RV
- You want dual zone (independent fridge and freezer)
- You need 12V/24V DC operation
- You want something that works reliably in harsh conditions
- You're okay with the price for a buy-once piece of gear
Skip it if:
- You just need a cooler for weekend trips — get a quality ice chest instead
- Budget is tight — the Dometic CFX5 36 (~$600) is the same build quality in a smaller single-zone package
- You need something you can easily carry — at 55 lbs empty, this isn't a grab-and-go cooler
Alternatives
| Cooler | Capacity | Zones | Price | Notes |
|---|---|---|---|---|
| Dometic CFX5 75DZ | 75L | Dual | ~$900 | Our pick — proven reliable |
| Dometic CFX5 36 | 36L | Single | ~$600 | Same quality, smaller |
| ARB 73 Quart | 73 Qt | Dual | ~$1,100 | Overlanding favorite, pricier |
| Engel MR040 | 40 Qt | Single | ~$700 | Legendary reliability, smaller |
| Iceco VL75ProD | 75L | Dual | ~$600 | Budget alternative, less proven |
The Bottom Line
Three years, zero failures (minus a latch), and it's kept our food cold through everything the Caribbean has thrown at us. The Dometic CFX5 75DZ is expensive, heavy, and the Bluetooth is pointless. But it's also the most reliable portable fridge/freezer we've ever owned. The dual zone with independent controls is genuinely useful, the baskets keep things organized, and the power flexibility means it works anywhere.
If you live on a boat or full-time in an RV and need cold storage that just works — this is the one to buy.
Mounting on a Boat or RV
If you're installing the CFX5 75DZ in a boat or RV, the Dometic OEM slide mount kit is essential. It lets you pull the fridge fully out for access and locks securely while underway. It is sized exactly for the 75DZ — no fitting required.
→ Dometic Slide Mount Kit for CFX5 75DZ on Dupree Products
