The best ice makers for cold plunges

The verdict: buy the EUHOMY 100 lb/24 h undercounter machine — it publishes output, cycle time, cubes per cycle and a 33 lb bin, and it states plainly that it is gravity drain with no pump, which is the fact that decides whether it can go where you want it. Buy the VEVOR instead if your sessions are scheduled rather than spontaneous: it is the only machine here that publishes a powered-off hold time (6-8 hours), so you can make ice overnight and still have it at lunchtime. Buy the Mojgar if you need to know the cabinet will fit before you commit, because it is the only one that publishes its dimensions and its supply thread. And read the arithmetic below first: on most tubs, one machine is a top-up, not a cooling system.

How much ice a plunge actually needs

The arithmetic is fixed and worth doing before you buy a machine. It takes about 144 BTU to melt one pound of ice, and one BTU raises one pound of water by 1 °F, so a pound of ice absorbs roughly the heat of cooling 144 pounds of water by one degree. Water weighs about 8.34 lb/gal. Our chiller vs ice page works this through in full; the numbers below are the same calculation set against what these machines produce in a day.

Why the bin matters more than the output figure

Here is the trap. A 100 lb/24 h machine does not hold 100 pounds — it holds 20 to 33 pounds, and the bin is not refrigerated. On most of these, meltwater drains back to the reservoir and is re-frozen, which is efficient and means the bin is a buffer rather than storage. So a session that needs 87 pounds cannot be served from the bin: you have to harvest into a chest freezer or coolers over a day or two, then dump it. That is the real workflow, and nobody's listing describes it. The VEVOR's published 6-8 hour powered-off hold is the one spec that makes the buffer genuinely useful.

The picks side by side

Who each pick is for

• EUHOMY — the best-documented 100 lb machine. Output, cycle time, cubes per cycle, a 33 lb bin and an honest statement about gravity drainage. Buy it if you have a drain. Skip it if you do not; there is no pump.
• VEVOR — scheduled sessions. The 6-8 hour powered-off hold and the fastest published cycle (8-10 min) make it the one that fits a routine. Skip it if you plunge whenever the mood takes you, since the hold window helps a schedule, not a whim.
• Mojgar — you need to plan the install. The only machine here publishing cabinet dimensions (15.1 × 15.7 × 29 in), front venting, a 1/2 in male supply thread and a 24-month compressor warranty. Skip it if the only space you have is sealed in a cabinet.
• Coolake nugget — the one you can cost against a chiller. Publishes about 4.37 kWh/24 h, makes nugget ice which melts faster per pound, and carries a 5-year compressor warranty. Skip it if it costs more than a chiller for your tub, because at that point the ice route has stopped making sense.
• COWSAR — awkward plumbing. Dual water inlet options and elevated feet, which is exactly what a garage next to a wet floor needs. Skip it if your supply and drain are already conventional; you are paying for flexibility you do not need.
• Frigidaire EFIC237 — no plumbing at all. Plugs into an outlet, no water line, no drain. Buy it to top up a bathtub plunge. Skip it for anything bigger: 44 lb/24 h against a 3 lb bin is a trickle.

Nugget or cube

Nugget ice has far more surface area per pound than a 22 mm cube, so it melts faster — which is a flaw in a drink and the point in a plunge. Faster melt means the heat transfer happens in minutes rather than over a session, so the tub reaches temperature before you get in rather than while you sit there. The arithmetic does not change: a pound of ice absorbs 144 BTU whichever shape it is in. What changes is how quickly it does it, and whether you are standing in a tub that is still cooling.

When a chiller is simply the cheaper answer

Be honest about this before you buy a machine. A 1 HP chiller holds a set point indefinitely, needs no harvesting, no freezer, no shovelling and no drain, and several cost less than the nugget machine on this page. The cases where an ice maker genuinely wins are narrow and real: a bathtub plunge where no chiller can be plumbed, a rental where you cannot install anything, a cold-climate setup that only runs in summer, and a household that already wanted an ice machine. Everywhere else, run the numbers in chiller vs ice and cold plunge running costs and let them decide.

What nobody publishes

• Energy draw, on five of six. Only the nugget machine gives a kWh figure, which is the only number that lets you compare the ice route to a chiller directly.
• Ambient derating. Every one of these is rated at some unstated room temperature. A machine in a hot garage in August produces less than its label, and none of them says how much less.
• Bin insulation, mostly. Two listings describe an insulated bin and one gives a hold time. The rest leave it to you to discover that the bin melts.
• Noise. Not one of these publishes a dB figure, which matters for a machine running continuously in a garage next to a house.

Every pick on this page comes from published specifications, not from hardware we own. Read how we pick — including what spec-led ranking cannot tell you.