How to Size a Commercial Ice Machine

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Updated October 14, 2026

Published ice usage figures

Source: Manitowoc Ice Usage Guide. For patient ice in healthcare, Manitowoc's guide sizes by bed count per model; ask for a sizing review. See ice machines in healthcare.

A worked example

A 120-seat restaurant with a 20-seat bar: 120 × 1.5 = 180 lb, plus 20 × 3 = 60 lb, for 240 lb on a peak day. Add 20% or more for growth and hot days, and you are looking for a machine that really produces around 290 lb per day in your kitchen, not just on the nameplate.

Nameplate vs real output

Production ratings are measured at standard conditions (commonly 70°F air and 50°F water). In a hot kitchen with warm incoming water, an air-cooled machine makes less. Every spec sheet has a production table by air and water temperature; use the row that matches your room. See cooling types.

Bin size matters too

The machine makes ice continuously, but you use most of it in a few busy hours. A bin sized to hold your peak-period need lets the machine catch up overnight. Too much storage for a slow business means old, clumped ice; see cubes stuck together.

One big machine or two smaller ones?

Two machines cost more but give you backup if one fails. Restaurants that cannot run without ice, hospitals and hotels often choose redundancy.

Match ice type to use

Bars want slow-melting full cubes, soda programs want half cube or nugget, seafood displays want flake. See ice types compared and ice machines by industry.

Step by step

1. Count seats, rooms or covers for your busiest day, not your average day.
2. Apply the usage figures above for each part of the business (dining, bar, guest rooms, catering).
3. Add drinks-based demand for counters and self-serve using the per-drink figures.
4. Add special uses: salad bar or seafood displays, cold-plate dispensers (+50%), bagged ice sales.
5. Add a margin for hot days and growth.
6. Check the production table at your real room and water temperatures.
7. Size the bin to cover your busiest few hours.

Example sizes by business

These are planning estimates before the margin and before real-world derating.

Bay Area factors

• Hot kitchens. Cook lines and closed storerooms run well above the 70°F rating condition.
• Warm incoming water. Late summer supply water runs warmer than the 50°F rating point, cutting output.
• Hard water. Scale slowly reduces output between cleanings; see hard water by area.
• Space. Tight urban sites often push toward undercounter or remote-cooled machines. See undercounter machines.

Cube, flake or nugget changes the answer

Flake and nugget machines are rated in pounds too, but nugget ice fills a cup with less weight than dense cubes, and flake ice for displays is measured by the display volume (Manitowoc's guide uses 30 lb per cubic foot of salad bar). Choose the ice type first, then size.

Signs your machine is undersized

• The bin is empty by the end of lunch or the bar's first rush.
• Staff buy bagged ice on weekends.
• The machine never shuts off on its bin control, even overnight.
• Scale and wear build faster because it runs nonstop.

Before buying bigger, confirm the machine still makes its rated output: a dirty condenser or scale can cut production enough to look like a sizing problem. See slow production.

Oversizing has costs too

A machine far bigger than your use means ice sits for days, clumps and picks up odors, and you pay for capacity you do not use. See cubes stuck together.

Frequently asked questions

Sources

• Manitowoc Ice Usage Guide (sizing sheet)
• DOE energy conservation standards for automatic commercial ice makers (2015 final rule)

Published by Cool Aid Air Conditioning & Refrigeration, a family business serving the Bay Area since 1966. Owner Jim McKinny holds California C-20 and C-38 contractor licenses and EPA Universal certification. Repairs we complete carry our 1-year parts & labor warranty.