How long does an ice maker take to make ice? Residential cube machines from brands like Sub-Zero and Scotsman drop their first batch in about 30 to 35 minutes, but filling the bin takes much longer: from roughly 2 hours on a fast commercial undercounter to a full day or more on a small residential unit. The real answer depends on three numbers you can find on any listing: daily production, bin capacity, and the temperatures that production was measured at.
If your machine is making less ice than it should, our ice machine not making ice troubleshooting guide covers the causes.
How long does an ice maker take to make ice: first batch time
Manufacturer documentation is fairly consistent on the first cycle:
- Sub-Zero says that at initial start-up its UC-15i undercounter ice maker needs approximately 30 minutes to freeze ice and up to five minutes to harvest it, and tells you to wait for the first cycle of cubes to drop to confirm the install is correct.
- Scotsman says in its CU50 user manual that ice falls into the bin after about a half hour, and that the machine makes 24 cubes per batch.
Scotsman also notes that it is normal for the first batches to melt until the bin has cooled down. A warm, insulated bin eats ice before it starts storing it, so the bin looks empty for longer than the cycle time suggests.
Why the first batches get thrown out
Hoshizaki’s ice and refrigeration start-up flyer covers restarting after a long shutdown: replace the water filters, turn the water on, then the power. For cubers it says to make one batch and discard the ice. For flakers and cubelet machines it says to run for 20 minutes and then discard the ice. Your own manual has the final word on start-up steps, so follow it if it differs.
Ice machine harvest cycle: batch versus continuous
Cube machines (crescent, dice, half dice, clear) work in batches. Water freezes on a cold plate or grid for the freeze portion of the cycle, then a short harvest step releases the slab or cubes into the bin, and the cycle repeats.
Nugget and flake machines are different. They produce ice continuously rather than in batches, which is why Hoshizaki’s restart guidance gives flakers and cubelets a time (20 minutes) rather than a batch count.
Nugget vs cube production speed
Ice type matters less than machine size. On our listings, a small residential nugget unit and a small cube unit land in a similar range, while a commercial undercounter of either type is several times faster. Compare lb per 24 hours, not ice type.
How long to fill the ice bin: the math
Every listing gives daily production in lb per 24 hours and a bin or storage capacity in lb. To estimate how long it takes to fill an empty bin:
Hours to fill = bin capacity / (daily production / 24)
Example: a machine rated at 62 lb per day makes about 2.6 lb per hour. A 31 lb bin divided by 2.6 lb per hour is about 12 hours. That assumes nobody is scooping ice and the bin is already cold, so treat it as the best case.
The table uses numbers from our product listings. Where a listing gives two ratings, the first is at 70 F air and 50 F water and the second is the AHRI certified figure at 90 F air and 70 F water.
| Machine | Ice type | Listed production (lb per 24 hr) | Bin (lb) | Hours to fill from empty |
|---|---|---|---|---|
| Marvel 15 inch 25 lb crescent ice machine | Crescent | 25 | 25 | 24.0 |
| Manitowoc USE0050A CrystalCraft | Clear square cube | 45 / 35 AHRI | 25 | 13.3 / 17.1 |
| Manitowoc UDP0065A NEO undercounter | Dice | 62 / 48 AHRI | 31 | 12.0 / 15.5 |
| U-Line 15 inch nugget ice machine | Nugget | 65 | 27 | 10.0 |
| Icetro IU-0090-ANP | Nugget | 91 (70/50) | 24.3 | 6.4 |
| Manitowoc UNP0200A undercounter | Nugget | 213 / 164 AHRI | 20 | 2.3 / 2.9 |
| Manitowoc URP0310A NEO undercounter | Regular dice | 300 / 245 AHRI | 119 | 9.5 / 11.7 |
| Manitowoc RNP0320A with D320 bin | Nugget | 308 / 236 AHRI | 264 | 20.6 / 26.8 |
A big bin on a modular head takes the longest to fill because it is meant to bank ice overnight. A small bin on a fast machine fills in a couple of hours, then idles until you scoop. For matching the two, see our ice bin size guide, and for working out how much production you need in the first place, start with what size ice machine do I need.
Real-world fill times run longer than the table. Scotsman’s CU50 manual says it takes 8 to 10 hours of continuous run time to fill that machine’s bin, and Sub-Zero’s ice production support page says it may take 2 days to fill an empty ice bin. Hoshizaki’s start-up flyer tells businesses to let the ice maker run for 24 hours before reopening so the bin can fill. Plan your first day around that.
Factors: ambient and water temperature
The two ratings on Manitowoc listings show the effect clearly. The same UDP0065A is listed at 62 lb per day at 70 F air and 50 F water, but 48 lb at 90 F air and 70 F water, about 23 percent less. The UNP0200A drops from 213 to 164 lb, and the RNP0320A from 308 to 236 lb. Warmer air makes the condenser work harder and warmer water takes longer to freeze, so every cycle stretches.
Scotsman makes the same point from the other side: its CU50 manual says the machine works best between 70 and 80 F, and that a low bin level is normal when the unit runs below 65 F. Check the ambient range on your listing too. The Marvel crescent unit above lists 50 to 100 F.
Condenser type matters as well, since an air-cooled unit breathes the room air that the 90/70 rating is about. We cover how air-cooled, water-cooled and remote condensers compare in air cooled vs water cooled ice machines. Water supply, drain and electrical work for any ice machine should be done by a licensed plumber or electrician, and local code has the final word.
When slow means a problem
Use the listed rating at your conditions as the yardstick. If a machine in a 70 F room with cold water is well short of its 90/70 AHRI number, or cycles take far longer than they did when new, something is off: a dirty condenser, scale, a clogged filter or poor airflow are the usual suspects. Our not making ice guide walks through each one.
Frequently asked questions
How long does an ice maker take to make ice the first time?
Manufacturers such as Sub-Zero and Scotsman put the first harvest at roughly 30 minutes, with Sub-Zero adding up to 5 minutes for harvest. Expect the first batches to melt in a warm bin, and follow your manual on discarding start-up ice.
How long does it take to fill an ice bin?
Divide bin capacity by hourly production (daily production divided by 24). On our listings that ranges from about 2 hours to about 27 hours from empty, and real-world times run longer while the bin cools and ice is being used.
Is nugget ice faster to make than cube ice?
Not by itself. Nugget machines produce continuously and cube machines work in batches, but the lb per 24 hours rating, which depends on machine size, decides how fast ice piles up.
Why is my ice maker slower in summer?
Production ratings fall as air and water temperatures rise. Manitowoc listings show drops of about 20 to 25 percent between 70/50 and 90/70 conditions.
Not sure which machine fits your space and service? Browse our Manitowoc ice machines or call us at 866-777-2590, Monday to Friday, 9AM to 6PM PST. Orders of $999 or more ship with free freight shipping, and orders below that ship for a $200 flat rate. Before you buy, review our return and refund policy.
