Bullet, nugget, cube and crushed: what each machine actually makes
Almost every disappointed ice maker review comes down to one thing: the buyer wanted one kind of ice and the machine physically makes another. Ice type is not a setting. It is decided by the mechanism inside the machine, and no machine can be persuaded to make a different kind.
The one thing worth knowing before you shop. "Nugget" is the most misused word in this category. Nugget ice needs an auger and a gearbox. Bullet ice needs a set of chilled prongs. The second is far cheaper to build, and a large number of machines advertised with the word nugget produce hollow bullets. The tell is in the product photos: if the pieces are cylinders with a hole through them, it is bullet ice whatever the listing calls it.
The five types
Bullet
How it is made. Metal prongs are chilled and dipped into a water tray. Ice forms around each prong, then a brief reverse cycle warms them so the ice slides off.
What it looks like. Hollow cylinders, roughly thumb-sized, with a hole through the middle.
Speed. Fastest of any type. First ice typically in six to fifteen minutes.
The trade-off. The hole is the whole story. It gives a lot of surface area for very little mass, so bullet ice chills a drink quickly and then melts and dilutes it quickly.
Where you find it. Almost every countertop machine under about $250 in Australia.
Nugget
How it is made. Ice is frozen as a thin flake against a chilled cylinder, scraped off by a rotating auger, and compressed through a die into soft pellets.
What it looks like. Small soft pellets that can be chewed. Sometimes called pebble or sonic ice.
Speed. Slow to start, then continuous. Typically fifteen to twenty-five minutes to first ice.
The trade-off. It is porous, so it soaks up whatever it is sitting in. That is exactly why people love it in a soft drink and exactly why it waters down a spirit fastest of all.
Where you find it. A genuinely different and more expensive mechanism, with an auger and a gearbox rather than a set of prongs.
Clear cube
How it is made. Water is sprayed or cascaded repeatedly over a chilled grid so it freezes in thin layers, pushing dissolved air and minerals out as it goes.
What it looks like. Solid squares or half-cubes, visibly clear rather than white.
Speed. Slowest. Often twenty minutes or more per cycle, by design.
The trade-off. Dense, slow to melt and the only type that suits a spirit you actually care about. You pay for it in cycle time, machine price and usually a plumbed water connection.
Where you find it. Commercial cubers and premium undercounter machines.
Crushed
How it is made. Not a freezing method. Cube ice is made normally and then broken up by a crusher on the way out.
What it looks like. Irregular shards.
Speed. Same as whatever made the cube.
The trade-off. Melts fastest of everything because the pieces are small and jagged. Good for chilling something fast, poor for anything you will drink slowly.
Where you find it. Fridge door dispensers, and a small number of benchtop machines with a crusher.
Sphere
How it is made. Effectively no consumer machine makes these. They come from silicone moulds, an insulated directional-freezing tray, or a press.
What it looks like. Balls, typically 55mm to 65mm.
Speed. Hours, in a freezer.
The trade-off. The least surface area per unit of mass of any ice, so it melts slowest. That is the entire point of it and it is why it belongs with whisky.
Where you find it. Moulds and presses, not ice makers. Worth knowing before you shop for a machine.
Choosing by what you actually do with ice
Ice type only matters for drinks you hold. For everything else, output in kilograms per 24 hours matters far more, and that is a different comparison entirely.
- Filling an esky or a drinks tub. Ignore ice type completely. Buy on output and on how fast the machine refills the basket. See the ice output register.
- Soft drink, iced coffee, anything you chew the ice from. This is the one case where nugget is genuinely worth paying for, and where a bullet machine will not satisfy you. See nugget and pebble machines.
- Whisky and spirits. No countertop ice maker is the right answer. A directional-freezing tray or a mould in the freezer costs a fraction as much and produces better ice for that specific job.
- Everyday cold drinks at home. Bullet ice is genuinely fine, and it is fast and cheap. See countertop machines.
- Camping, boat or caravan. Type is irrelevant next to power draw and whether it runs off your setup at all. See portable machines.
A note on "clear ice" claims
A number of budget machines advertise clear ice. Clarity comes from freezing water slowly in layers so dissolved air is driven out ahead of the ice front, which is the opposite of what a fast prong-based machine does. Filtered water will make bullet ice marginally less cloudy. It will not make it clear, because the cloudiness is a product of how quickly it froze rather than what was in the water.
Common questions
Why is the ice from my machine hollow?
Because it froze around a metal prong. That is how nearly every countertop ice maker works: chilled fingers dip into water, ice builds up around them, and a short warm cycle releases it. The hole is a consequence of the mechanism, not a fault, and no amount of cleaning or filtering will make that machine produce solid cubes.
Is bullet ice the same as nugget ice?
No, and this is the most common misunderstanding in the category. Bullet ice is a hard hollow cylinder made by a prong. Nugget ice is a soft chewable pellet made by scraping flake ice off a drum and compressing it through an auger. They are different mechanisms producing different products, and machines built around an auger cost substantially more. If a cheap machine is advertised as making nugget ice, look at the product photos before believing it.
Why is my ice cloudy and white?
Cloudiness is trapped air and dissolved minerals, and it is mostly caused by freezing quickly from all sides at once, which is what a fast countertop machine does deliberately. Clear ice comes from freezing slowly in layers so the air is pushed ahead of the ice front. Filtered or boiled water helps a little at the margins, but the mechanism matters far more than the water.
Which type melts slowest in a drink?
Larger and more solid means slower. A sphere melts slowest, then a solid clear cube, then a hollow bullet, then nugget and crushed. If you are drinking something over an hour, that ordering is the whole decision. If you are filling an esky, it does not matter at all and you should buy on output instead.