Quick Answer: The Silonn SLIM21 is a compact, self-cleaning countertop bullet ice maker that lists at $89.99 but regularly sells for $68-80 on Amazon and at retailers like Newegg (confirmed July 2026). It’s rated for up to 26 lbs of ice in 24 hours from a body just 8.7 inches wide, with a first batch of 9 bullet cubes ready in about 6 minutes. Independent long-term testing puts real-world daily output closer to 14-18 lbs once melt-back between batches is accounted for — still enough for most households, RVs, and small offices, just short of the marketing number. At its price, it’s the cheapest reservoir-fed ice maker we track on the site.
We already rank the SLIM21 as the top overall pick in our best small ice maker guide and the budget pick in our best self-cleaning ice maker guide; this review goes deeper on the real specs, the cleaning routine, and where the marketing numbers and real-world use part ways.
Silonn SLIM21 at a glance
| Spec | Silonn SLIM21 |
|---|---|
| Ice type | Bullet, 2 sizes (large ~1in, small ~20% smaller) |
| Advertised output | Up to 26 lbs / 24 hrs |
| Real-world output | ~14-18 lbs / 24 hrs (Ice Artisan long-term test) |
| First batch | 9 cubes in about 6 minutes |
| Dimensions | 8.7"W x 11.4"D x 11.6"H |
| Weight | 13.7 lbs |
| Storage basket | ~1.2-1.3 lbs capacity |
| Warranty | 1-year limited + 30-day money-back via authorized retailers |
| Price | $89.99 list / ~$68-80 street |
Silonn SLIM21 Countertop Ice Maker
- 8.7 inches wide — fits almost any counter, RV galley, or office breakroom corner.
- First batch of bullet ice in about 6 minutes; self-clean mode activates with a 5-second button hold.
- Carry handle and reservoir-fed design — no water line, no drain, plug into any outlet.
- The cheapest self-cleaning countertop ice maker we track on the site.
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Output: the advertised number vs. real use
Silonn rates the SLIM21 at up to 26 lbs of ice in 24 hours, based on 9 bullet cubes roughly every 6 minutes running continuously. In practice, a long-term test by Ice Artisan (2026) measured real-world daily output closer to 14-18 lbs, not because the machine cycles slower than advertised, but because the storage basket holds only about 1.2-1.3 lbs of ice before it starts melting back into the reservoir. That’s true of every countertop ice maker to some degree — none of them freeze the storage bin — but it’s most visible on a compact unit like this one where the basket is small relative to the cycle speed. For a household or small office pulling ice throughout the day rather than all at once, 14-18 lbs is plenty; if you need to fill a cooler for a party in one go, size up to a machine with a bigger basket or plan to bag ice as it’s made.
Size and where it fits
At 8.7 inches wide, 11.4 inches deep, and 11.6 inches tall, and weighing 13.7 lbs, the SLIM21 is one of the narrowest ice makers we track — it fits an RV galley counter, a dorm desk, or an office breakroom corner that a full-size countertop unit can’t. It’s reservoir-fed, so it needs no water line or drain: you pour water in by hand and empty the basket as needed, which is exactly why it works as well on a boat or in a rental as it does in a kitchen.
Cleaning and maintenance
The SLIM21’s self-clean cycle starts by holding the power button for about 5 seconds, which circulates water through the system for 5-10 minutes to help flush mineral buildup. Silonn lists a water-and-vinegar mix as an acceptable solution for this cycle, which keeps routine maintenance to pennies — but as with every ice maker on this site, a clean cycle flushes, it doesn’t descale. Run the self-clean weekly, and use a nickel-safe descaler (not straight vinegar or CLR) about once a month if you’re in a hard-water area; see our best ice maker cleaners and descalers guide for a product that won’t corrode the internal parts.
Silonn SLIM21 vs. the competition
- vs. Frigidaire EFIC117-SS (compact classic): Nearly identical footprint and the same ~26 lbs/day advertised output, for about $110 versus the SLIM21’s $69-90 street price. The Frigidaire carries more brand history in countertop appliances; the SLIM21 undercuts it on price and adds a self-clean mode the EFIC117-SS doesn’t have.
- vs. GE Profile Opal Mini (small nugget): A different ice type entirely — the Opal Mini ($299-399) makes soft, chewable nugget ice in a similarly compact 8.6-inch-wide body, but at roughly 3-4x the price. Buy the SLIM21 for cheap bullet ice fast; buy the Opal Mini if chewable nugget ice is the actual goal. Full comparison in our Opal Mini review.
- vs. Chefman Iceman (absolute smallest): The Iceman trims the footprint down further for shoppers who need the tiniest unit possible, at a similar ~$100 price point, but the SLIM21’s self-clean mode and carry handle are the more practical everyday features.
Who should buy the Silonn SLIM21?
Buy it if counter space is genuinely tight — an RV, boat, dorm, or breakroom — and you want the lowest price on a reservoir-fed machine with a self-clean mode. Skip it if you regularly need to fill a cooler in one sitting (the small basket means frequent emptying) or you want chewable nugget ice instead of bullet cubes, in which case the Opal Mini or Euhomy Nugget is the better fit.
The bottom line
The Silonn SLIM21 earns its spot as our budget pick by doing the basics cheaply and reliably: a genuinely compact footprint, a real self-clean mode, and a street price under $80 that undercuts nearly everything else on the site. The advertised 26 lbs/day is optimistic for continuous real-world use — plan on 14-18 lbs instead — but for the price, and the counter space it gives back, it’s still the easiest recommendation for anyone who just needs cold drinks without a plumbing job or a big machine.