Dometic CFX3 45vs ARB Zero 47

A 12V fridge is the most expensive convenience in an overland build, and this is the premium matchup: Dometic’s CFX3 45 against ARB’s Zero 47. Both are compressor fridges that will freeze ice cream in a hot truck. Both come from brands with decades of four-wheel-drive credibility. The $1,000+ question is what each one spends its engineering budget on — and they made opposite bets.

Cooling performance: a tie in the way that matters

Set either box to fridge or freezer temps and it gets there and stays there, through desert afternoons and full sun. The Dometic reaches −7°F, the ARB plays in the same deep-freeze class, and owner reports from years of use put both firmly in “it just works” territory, with the occasional out-of-warranty compressor failure reported on both sides at similar, low rates. Nobody buys either fridge and complains about cold.

Power efficiency: the round that decides overlanding duels

~½ The Dometic's power draw compared to the ARB in comparable-condition owner testing — around 1.4 A versus 2.9 A at 12V holding temperature in similar heat.

This is the CFX3’s signature advantage, and it’s why efficiency-minded builders default to it. If your power budget is generous — big solar, alternator charging, short trips — the gap matters less, but it never matters zero.

Build & mounting: where ARB spent the money

Put the two side by side and the ARB looks like it’s wearing body armor, because it is — reinforced corners and edges built to shrug off trail impacts, and the best tie-down system in the class: heavy-duty stainless brackets that bolt the fridge down like cargo, not luggage. The front-opening lid on the 47 is a genuine layout advantage in vans and canopy builds where a top lid fights the ceiling, and the removable insulated divider lets you run a freezer section without buying a dual-zone. It’s also 11 pounds heavier — armor weighs something.

App & controls: Dometic’s polish shows

The CFX3’s color display and WiFi-plus-Bluetooth app are the best in the category — set points, battery protection levels, and temperature logging from your phone, over either connection. The ARB does the same essentials over Bluetooth only, competently but with less polish. Owner threads treat the Dometic app as a quiet daily pleasure and the ARB app as a tool you open occasionally. Not a dealbreaker either way; a clear points win.

Price & value

~$300 The typical gap — CFX3 45 around $950–$1,100 against the Zero 47's $1,200–$1,350 — in favor of the fridge that also draws less power and weighs 11 lb less.

The ARB’s premium buys real hardware: the armor, the brackets, the front lid. But you have to need those things for the math to work, because the Dometic isn’t the budget option in this duel — it’s the default option that happens to cost less.

Where they’re genuinely the same

Both run on 12/24V DC or household AC with proper battery protection, both are quiet enough to sleep next to in a camper, both handle dual-battery and solar setups happily, and both brands have parts and service networks that will still exist in ten years — which is not nothing at this price.

The verdict

For most people: the Dometic CFX3 45. Equal cooling for roughly half the battery draw, 11 fewer pounds, the best app and display in the class, and about $300 saved.

Buy the ARB Zero 47 instead if the fridge lives bolted in an open bed or trailer taking real abuse, your build needs the front-opening lid, or you want the divider trick for part-time freezer duty. It’s the tougher box; the Dometic is the smarter appliance.