The clatter of an empty ice tray is a sound no home bar or busy kitchen should ever endure. An 18-inch undercounter ice maker transforms that frustration into a steady, silent stream of crystal-clear cubes, turning your counter into a professional-grade ice station. These built-in or freestanding machines are purpose-built to fit a standard 18-inch cabinet opening, delivering restaurant-quality ice without sacrificing valuable floor space.
I’m Mohammad Maruf — the founder and writer behind AirfryerBite. I’ve spent years analyzing the hardware specifications, compressor efficiency, and real-world reliability of commercial and residential ice machines to help you make a well-informed purchase.
This guide breaks down the critical specs—daily production in pounds, storage bin capacity, drain pump versus gravity drain, and refrigerant type—so you can confidently choose the best 18 inch undercounter ice maker for your home, bar, or cafe.
How To Choose The Best 18 Inch Undercounter Ice Maker
Selecting the right undercounter ice maker requires more than just matching the width. You need to balance production volume, storage capacity, drainage method, and build quality to match your specific usage pattern, whether that’s a busy family kitchen, a home bar, or a light commercial setting.
Daily Ice Production vs. Storage Capacity
Daily production (measured in pounds per 24 hours) determines how much ice the machine can create from scratch. Storage capacity (the bin size) dictates how much ice is available at any given moment. For a household that entertains regularly, a machine producing 85–100 lbs daily with a 24–35 lb bin is a solid starting point. Commercial environments with high demand need 200 lbs or more per day with a 65–132 lb bin.
Drain Pump vs. Gravity Drain
A gravity drain requires the machine to be positioned above a floor drain or have a drain line that slopes downward. This can severely limit installation locations. A drain pump, by contrast, actively pumps water upward and out, allowing the ice maker to be installed in basements, islands, or any spot without a direct downward drain path. If installation flexibility is a priority, prioritize models with a built-in drain pump.
Refrigerant Type and Efficiency
R290a (propane-based) is the modern standard for undercounter ice makers. It offers superior thermodynamic performance, lower energy consumption, and a lower global warming potential compared to older R134a systems. Many newer units use R290a, which also runs at a lower operating pressure. Always check the refrigerant label before purchasing.
Ice Shape and Clarity
Most 18-inch models produce clear, crescent-shaped, or cube-shaped ice. Clear ice is visually appealing and melts more slowly because it has fewer impurities. Adjustable ice thickness is a valuable feature—thicker cubes last longer in the glass, while thinner cubes chill drinks faster. Crescent-shaped ice is a favorite for beverages because it doesn’t clump together.
Self-Cleaning and Maintenance Features
Mineral buildup and bacteria are the enemies of any ice machine. A self-cleaning function that circulates a cleaning solution through the water system with a single button press simplifies regular maintenance. Some models also include a water filter to reduce scale buildup and improve ice taste. Without these features, you’ll need to manually descale the machine every few months.
Quick Comparison
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| Model | Category | Best For | Key Spec | Amazon |
|---|---|---|---|---|
| Coolake 320lbs | Commercial | High-volume restaurants & bars | 320 lbs/day production, 120 lb bin | Amazon |
| RAPSUAR 500lbs | Heavy-Duty | Large events & high-traffic venues | 500 lbs/day, 132 lb storage, 780W | Amazon |
| EUHOMY 200lbs | Mid-Size | Moderate commercial & large families | 200 lbs/day, 65 lb storage, ETL | Amazon |
| EdgeStar IB450SSP | Clear Ice | Premium residential & small bar | 50 lbs/day, 25 lb bin, drain pump | Amazon |
| RAPSUAR 95Lbs | Residential | Home kitchens & home bars | 95 lbs/day, 35 lb bin, reversible door | Amazon |
| ICYGLEE 100Lbs | Value | Budget-conscious buyers | 100 lbs/day, 24 lb bin, drain pump | Amazon |
| EUHOMY 100lbs | Mid-Range | Balanced home/office use | 100 lbs/day, 24 lb bin, 24H timer | Amazon |
| EUHOMY 85Lbs | Compact | Small kitchens & offices | 85 lbs/day, 24 lb bin, self-cleaning | Amazon |
| COTLIN Drainless | No-Drain | Installations without drain access | 42 lbs/day, 22 lb bin, drainless | Amazon |
| EdgeStar IB250 | Compact Freezer | Small spaces, no drain line | 25 lbs/day, 20 lb bin, no drain | Amazon |
| Scotsman CU50GA | Premium Gourmet | High-end bars & gourmet kitchens | 64 lbs/day, gourmet cubes, R134a | Amazon |
In‑Depth Reviews
1. Coolake Commercial Ice Maker 320lbs
This Coolake unit is built for serious volume, churning out 320 lbs of clear cube ice every 24 hours and storing up to 120 lbs in its heavily insulated bin. The thickened foam insulation keeps ice frozen for 7–9 hours, making it a reliable workhorse for bars, cafes, and busy restaurant kitchens that cannot afford downtime during service.
The integrated water filter reduces scale buildup by up to 99%, which directly extends the machine’s lifespan and improves ice taste. The intuitive LCD display allows you to adjust ice thickness and schedule cleaning cycles. With ETL approval and a 3-year parts/5-year compressor warranty, Coolake backs this machine with serious confidence for commercial use.
At 26 inches wide and 37 inches tall, this is a larger unit—it requires a generously sized undercounter space. The 575-watt R290a compressor is efficient and quiet for its output class. If your demand exceeds 200 lbs per day, this model delivers without breaking a sweat.
Why it’s great
- Enormous 120 lb ice storage bin reduces refill frequency.
- Included water filter improves ice clarity and taste while reducing scale.
- 3-year parts / 5-year compressor warranty provides long-term peace of mind.
Good to know
- Dimensions (26″W x 27.4″D x 37″H) require a larger cabinet cutout.
- Unit weight is not listed; anticipate a heavy, solid build that may require two-person installation.
2. RAPSUAR Commercial Ice Maker 500lbs
When your operation demands ice measured in hundreds of pounds, this RAPSUAR machine answers with a staggering 500 lbs daily production and a 132 lb storage bin. It produces up to 162 crystal-clear cubes every 6–20 minutes, easily supporting over 2,000 beverages per day. That puts it in a league for large events, high-volume bars, and commercial kitchens with relentless demand.
The full-touch LCD panel gives you precise control over ice thickness, timers, and the self-cleaning cycle. The built-in water filtration system transforms tap water into odor-free, chewable ice. The 780-watt compressor with air-cooling technology runs relatively quietly for its output class, and the heavy-duty stainless steel build with thick foam insulation keeps ice solid for extended periods.
At 26.54 inches wide and 43.74 inches tall, this unit is substantial and may not fit under standard 18-inch counter spaces—it’s better suited for freestanding or commercial counter installation. The drain pump system requires a floor drain or drain line nearby. For operations that need ice by the ton, this is a top contender.
Why it’s great
- Class-leading 500 lbs daily output with 132 lb storage bin.
- Smart full-touch LCD with adjustable ice thickness and cleaning cycle.
- Water filter included for improved ice quality and reduced mineral buildup.
Good to know
- Large footprint (26.5″W x 24.5″D x 43.7″H) may exceed standard undercounter dimensions.
- High upfront investment; requires a dedicated drain line for proper operation.
3. EUHOMY Commercial Ice Maker 200lbs
EUHOMY’s 200 lbs/day model bridges the gap between residential and light commercial, offering ETL certification for approved commercial use. It produces ice quickly with a powerful R290a compressor, and the 65 lb storage bin provides a generous buffer for parties, office break rooms, or small restaurants. The smart LCD panel shows ambient temperature and lets you dial in the exact cube size by adjusting the ice-making cycle time.
One notable design choice: this unit uses gravity drainage, not a drain pump. That means the drain line must be positioned below the machine’s drain output. If your installation site lacks a floor drain, you may need to install a condensate pump separately. The self-cleaning function is a simple 5-second button press, and the machine’s energy certification helps keep electricity costs manageable.
Customer feedback highlights fast production speed, but the gravity drain requirement may be a dealbreaker for basements or cabinets without a low drain point. The unit dimensions (17.13″D x 21.89″W x 35.08″H) fit an 18-inch cabinet but leave limited rear clearance for the drain hose.
Why it’s great
- ETL certified for commercial use; suitable for restaurants, bars, and cafes.
- High 200 lbs/day output with a large 65 lb storage bin.
- LCD panel with ambient temperature display and adjustable ice thickness.
Good to know
- Gravity drain only—requires a lower drain point for proper water removal.
- Some users report the bin fill sensor limits usable storage to around 30 lbs during operation.
4. EdgeStar IB450SSP 50lb Undercounter Clear Ice Maker
The EdgeStar IB450SSP is a 15-inch wide undercounter unit that produces up to 50 lbs of clear, restaurant-quality ice per day with a 25 lb storage bin. It uses a built-in drain pump, which dramatically expands installation flexibility compared to gravity-drain models. The pump allows the machine to be placed in basements, islands, or any location without a floor drain.
Ice is produced in sheets, not individual cubes, which is typical for clear ice machines. You’ll need to break the sheets apart manually, but the result is dense, slow-melting ice that looks stunning in cocktails. The commercial-grade stainless steel door, reversible hinge, and adjustable leveling legs add a polished, professional feel. EdgeStar recommends installation by a licensed plumber, and the drain hose length is 4.5 feet.
This model uses R134a refrigerant, which is an older technology compared to the R290a found in newer competitors. It also lacks a self-cleaning function and water filter. For buyers who prioritize ice clarity and pump convenience over maximum production volume, this remains a solid option.
Why it’s great
- Built-in drain pump allows flexible installation without a floor drain.
- Produces dense, clear, slow-melting gourmet ice sheets for premium drinks.
- Compact 15-inch width fits tight undercounter spaces.
Good to know
- Ice comes out in sheets that must be broken apart manually.
- Uses older R134a refrigerant instead of more efficient R290a.
- No self-cleaning function or built-in water filter.
5. RAPSUAR 95Lbs Undercounter Ice Maker
This RAPSUAR model is a strong residential choice, producing 95 lbs of clear cubes per day with a 35 lb storage bin—enough for a busy family kitchen or a home bar that sees frequent use. It churns out 40 cubes every 15–20 minutes, and you can adjust ice thickness to suit different drinks, from thick whiskey cubes to thinner cocktail ice.
The reversible door gives you flexibility in cabinet placement, while the 3-layer insulated housing keeps ice from melting prematurely. The 24-hour timer lets you schedule ice production during off-peak hours to save energy. An automatic water supply connection means you never have to manually refill a reservoir. The self-cleaning function simplifies maintenance.
Some users have reported issues with the door hinge breaking during normal use, which may point to a durability concern with the door mechanism. At 17 inches deep and 25 inches tall, this unit is relatively compact and fits under most standard counters. The 750-watt compressor delivers reliable performance, but the noise level is average for this category.
Why it’s great
- Large 35 lb storage bin is generous for a residential unit.
- Reversible door and compact dimensions offer flexible installation.
- 24-hour timer and self-cleaning function add daily convenience.
Good to know
- Some user reports of door hinge breakage over time.
- No integrated water filter; external filtration may be needed for hard water areas.
6. ICYGLEE 100Lbs Undercounter Ice Maker with Drain Pump
ICYGLEE delivers a compelling value proposition: 100 lbs of daily ice production, a built-in drain pump, and a 24 lb storage bin, all at a price point that undercuts many competitors with similar specs. The drain pump is the standout feature here—it allows you to install this unit in locations where gravity drainage isn’t possible, such as a basement bar or a kitchen island.
The machine produces one batch of 40 clear cubes every 8–16 minutes, and you can adjust ice thickness through the LCD panel. The 3-layer insulation keeps ice cold, and the reversible door accommodates left or right opening. The self-cleaning function and 24-hour timer are included, matching features found on more expensive models.
User reviews are generally very positive, with many praising the ice quality and quick production speed. A few users have reported issues with the drain pump if the drain hose isn’t properly positioned below the machine’s drain outlet. The 115V, 203-watt compressor is energy-efficient, but the R290a refrigerant ensures strong cooling performance.
Why it’s great
- Includes a drain pump for flexible installation without a floor drain.
- Produces clear, slow-melting cubes quickly (8–16 min per batch).
- Self-cleaning, LCD panel, and 24-hour timer at a competitive price.
Good to know
- Drain pump performance may be affected if drain hose isn’t positioned correctly.
- 24 lb storage bin is on the smaller side for high-demand use.
7. EUHOMY 100Lbs Undercounter Ice Maker with Drain Pump
This EUHOMY model is nearly identical in spec to the ICYGLEE—100 lbs daily production, 24 lb storage bin, and a drain pump—but differentiates itself with a slightly more compact footprint. The dimensions (14.96″W x 18.47″D x 33.99″H) make it a true 18-inch wide undercounter fit with modest depth, ideal for tighter spaces like a wet bar or compact kitchen.
The LCD panel displays ambient temperature and allows you to schedule production via the 24-hour timer. Ice thickness is adjustable by changing the freeze cycle time. The self-cleaning function is activated by holding the “Timer Clean” button for 5 seconds. The reversible door offers left or right opening, and the R290a refrigerant ensures efficient operation.
Installation requires a water line connection and proper drain hose routing. The drain pump means no floor drain is necessary, but the manufacturer advises keeping the unit upright for 24 hours before first use to let the compressor oil settle. This is a solid mid-range pick for homeowners who want a reliable drain-pump ice maker without overspending.
Why it’s great
- Compact 18-inch width fits standard undercounter openings with minimal depth.
- Drain pump eliminates the need for a floor drain.
- Self-cleaning, timer, and ice thickness adjustment via LCD panel.
Good to know
- 24 lb storage bin may require frequent emptying during heavy use.
- Requires 24-hour upright settling period before first operation.
8. EUHOMY 85Lbs Commercial Ice Maker
At 85 lbs per day with a 24 lb storage bin, this EUHOMY model is the entry-level workhorse for households that want a dedicated undercounter ice supply without commercial-level volume. It makes 40 clear cubes every 10–18 minutes, which is sufficient for daily family use, weekend gatherings, and a home bar.
The compact dimensions (14.96″W x 18.47″D x 33.99″H) make it one of the most space-efficient options on this list. The reversible door, 3-layer insulation, and LCD panel with ice thickness control are standard features. The self-cleaning function requires a water supply and a simple 5-second button press to activate.
A notable limitation is the gravity drain system—there is no drain pump. That restricts installation to locations where the drain line can slope downward, typically above a basement floor drain or crawlspace. The R290a refrigerant and 110V power draw make it energy-efficient. For buyers on a tighter budget who have a suitable drain location, this is a practical pick.
Why it’s great
- Very compact 18-inch width with shallow 18.47-inch depth.
- Self-cleaning, timer, and adjustable ice thickness at an entry-level price.
- 3-layer insulation reduces ice melting in the bin.
Good to know
- Gravity drain only—requires a drain point lower than the machine.
- 24 lb bin capacity may be insufficient for heavy entertaining or commercial use.
9. COTLIN 15″ Drainless Undercounter Ice Maker
The COTLIN drainless ice maker is a unique offering that completely eliminates the need for a drain line, making it the simplest to install of any unit on this list. You only need to connect the water supply and plug it in. This makes it ideal for apartments, offices, or any location where running a drain line is impractical or too expensive.
It produces a modest 42 lbs of crescent-shaped ice per day with a 22 lb storage bin. The crescent shape is a plus—it melts slowly and doesn’t clump, making it a favorite for cocktails. The 600-watt compressor uses R600a refrigerant, which is environmentally friendly but has lower cooling capacity than R290a. The stainless steel build with reversible door and adjustable feet adds installation flexibility.
The trade-off for the no-drain convenience is lower production volume and the need to periodically empty the internal water reservoir. The unit is ETL approved, and COTLIN offers lifetime service support. For a guest house, small office, or a secondary bar area where daily demand is low, this is the simplest solution available.
Why it’s great
- No drain line needed—simplest installation of any undercounter ice maker.
- Produces slow-melting crescent-shaped ice that doesn’t clump.
- ETL certified with lifetime service support from COTLIN.
Good to know
- Low daily production (42 lbs) limits use to light residential demand.
- 22 lb storage bin is smaller than most competitors.
- Uses R600a refrigerant, which has lower cooling performance than R290a.
10. EdgeStar IB250 15″ Undercounter Ice Maker
The EdgeStar IB250 is a 15-inch wide unit that doubles as a freezer—it keeps the ice frozen without a separate drain line. It produces 25 lbs of crescent-shaped ice per day with a 20 lb storage bin. The freezer function is a key differentiator: it ensures the ice stays solid even if the machine isn’t actively making ice, which also means it consumes more energy to maintain freezing temperatures.
Installation is simple since no drain line is required. The reversible door and removable ice bin add everyday flexibility. The unit measures 14.88 inches wide, which is narrower than the standard 18-inch opening, so you’ll need filler panels or a custom counter cutout to close the gap. It uses R134a refrigerant, which is less efficient than modern R290a alternatives.
Customer reviews are split. Many appreciate the quiet operation and convenience of the built-in freezer, but a significant number report the unit dying completely after one to two years. The lack of a self-cleaning function also means you’ll need to manually descale the system. This is a low-cost entry point, but long-term reliability is a concern.
Why it’s great
- Built-in freezer keeps ice frozen without a drain line.
- Quiet operation and simple installation process.
- Compact 15-inch width for tight spaces.
Good to know
- Frequent reports of unit failure within two years.
- Low 25 lbs/day production—only suitable for very light use.
- No self-cleaning function; manual descaling required.
11. Scotsman CU50GA Undercounter Gourmet Cube Ice Maker
The Scotsman CU50GA is the gold standard for premium, slow-melting gourmet ice. It produces up to 64 lbs per day of uniquely shaped, crystal-clear cubes that are virtually taste-free and odor-free. The water-quality sensor detects hard water conditions and purges mineral-laden water with every harvest cycle, extending the time between cleanings—a feature found on few competitors.
This is a gravity drain machine, requiring a floor drain or similar low point. It uses R134a refrigerant, which is older tech, but Scotsman’s robust build quality and commercial-grade components (100 lb unit weight) justify the premium price. The user-friendly control panel shows power status, no-water alerts, and cleaning reminders. It stores up to 26 lbs of ice in a built-in bin.
Installation by a licensed plumber is strongly recommended, as the 4.5-foot drain hose and water line connections require precise positioning. The 14.88-inch width fits an 18-inch opening with filler panels. The CU50GA is built for buyers who value ice quality and machine longevity above all else, and are willing to invest accordingly.
Why it’s great
- Produces premium gourmet cubes that are crystal-clear, slow-melting, and taste-free.
- Water-quality sensor purges mineral buildup automatically, extending cleaning intervals.
- Commercial-grade build quality with robust, heavy-duty construction.
Good to know
- Significantly higher price point than comparable-volume competitors.
- Gravity drain only; requires a floor drain or lower drain point.
- Uses older R134a refrigerant instead of more efficient R290a.
FAQ
Can an 18-inch undercounter ice maker be installed as a freestanding unit?
What is the difference between R290a and R134a refrigerant in an ice maker?
How often should I clean an undercounter ice maker?
Does an 18-inch undercounter ice maker require a water line?
Why does my undercounter ice maker produce cloudy or small ice cubes?
Final Thoughts: The Verdict
For most users, the best 18 inch undercounter ice maker winner is the ICYGLEE 100Lbs model because it delivers an ideal balance of daily production, a built-in drain pump for flexible installation, and self-cleaning convenience at a competitive price. If you need higher commercial output with extended bin storage and water filtration, grab the Coolake 320lbs machine. And for uncompromising ice quality and longevity in a gourmet setting, nothing beats the Scotsman CU50GA.