The most expensive mistake in this category is not buying the wrong brand. It is buying the wrong size, then discovering it in week three when the pizza dough climbs the hook, the motor gets hot and the section runs three batches where it budgeted one. A commercial mixer is sized by numbers that look straightforward on a spec sheet and mean different things depending on who wrote them.
This guide is about reading those numbers correctly. It covers why bowl litres are not batch size, the flour-weight versus finished-dough rating that is the single most misread spec in the category, where planetary and spiral mixers genuinely differ, which attachment does what, and how to work backwards from your daily output to a capacity that still copes in twelve months. It applies to commercial food mixers of every format: a benchtop commercial stand mixer in a cafe, a 20-litre planetary in a club kitchen, a floor-standing dough mixer machine in a bakery.
Bowl Litres Are Not Batch Size on a Commercial Planetary Mixer
Commercial planetary mixers are rated by the volume of the mixing bowl in litres — 5 litre, 10, 20, 30, 40 and up. That figure is the physical capacity of the bowl to the brim, not the amount of product you can mix in it. The working batch of any commercial stand mixer is always smaller, and how much smaller depends entirely on what you are mixing.
Aerating jobs need the most headroom. Whipping cream or egg whites with a whisk roughly doubles the volume, so a batch that starts half full ends near the rim, and cake batter climbs the sides as it takes air. Dough behaves the opposite way — it stays dense — but it loads the machine hardest, so the limit is the motor and gearbox rather than the space.
As a rule of thumb rather than a specification, plan on roughly two-thirds of the rated bowl volume as a workable batch for general mixing, and less again for anything whipped. A 20-litre planetary mixer is therefore a 12 to 14-litre kitchen mixer in practice. The bowl has a minimum too: a beater or whisk that is not immersed spins above the product, so a little mayonnaise in a 40-litre bowl will not emulsify. If batches vary wildly, two smaller commercial mixers beat one large commercial machine.
Flour Weight vs Finished Dough: The Most Misread Spec on Dough Mixers
Here is the one that costs kitchens real money. Dough mixers — spiral mixers especially, but any commercial dough mixer with a kilogram rating — are rated in kilograms, and that figure means one of two completely different things depending on the manufacturer:
- Flour weight — the kilograms of dry flour the machine handles per batch. The finished dough is heavier, because the water, salt and yeast are yet to be added.
- Finished dough (often written as finished product or dough capacity) — the total weight of mixed dough coming out of the bowl, flour and water together.
Two machines both badged "20 kg" can therefore differ by more than half in real output. The conversion is simple bakers' arithmetic. Total dough equals flour multiplied by one plus the hydration, plus the salt and yeast — at a typical 2% salt and 1% yeast, that is flour × (1 + hydration + 0.03).
| Hydration | Multiplier (flour to dough) | 20 kg of flour makes | A 20 kg finished-dough rating needs |
|---|---|---|---|
| 55% (bagel, firm doughs) | × 1.58 | 31.6 kg dough | 12.7 kg flour |
| 60% (standard bread dough) | × 1.63 | 32.6 kg dough | 12.3 kg flour |
| 65% (pizza dough, many sourdoughs) | × 1.68 | 33.6 kg dough | 11.9 kg flour |
| 70% (ciabatta, wet doughs) | × 1.73 | 34.6 kg dough | 11.6 kg flour |
Read across and the trap is obvious: at 65% hydration a flour-rated 20 kg machine produces about 33.6 kg of dough, while a finished-dough-rated 20 kg machine takes under 12 kg of flour. Order the second when you costed the first and you are a third short on every batch.
Three habits protect you. Ask the supplier, in writing, which basis the rating uses. Do your sums in the unit your recipes already use. And if a spec simply says "20 kg" with no qualifier, treat it as unconfirmed until someone states the basis — the honest commercial equipment listings spell it out in the model name.
Planetary Mixer vs Spiral Mixer: What Each One Is Actually For
Spiral and planetary mixers are not competing versions of the same machine. They do different work, and the honest answer for many commercial bakeries is that they eventually own both.
A planetary mixer takes its name from the motion: the attachment spins on its own axis while orbiting the fixed bowl, so it reaches every part of the mixing bowl. Swap the tool and the same stand mixer creams butter and sugar, whips cream, beats batter, mixes meatballs and — with a dough hook — kneads a modest quantity of dough. It is the general-purpose commercial food mixer, and for a restaurant or cafe that mixes many things and bakes some, it is the right first machine — the commercial equivalent of a domestic stand mixer, built for food service hours rather than Sunday afternoons.
A spiral mixer does one thing. A spiral-shaped hook stays put while the bowl rotates beneath it, with a central breaker bar dividing the mass so the dough is repeatedly folded through itself. It kneads faster, works heavier dough without straining, and — the part bakers care about most — puts far less friction heat into bread dough, which protects fermentation. It has no attachments and cannot whisk or cream anything, so a bakery still needs a planetary alongside it.
| Consideration | Planetary mixer | Spiral mixer |
|---|---|---|
| Best for | General mixing, creaming, whisking, batters, moderate dough | Bread dough, pizza dough, high-volume kneading |
| Motion | Tool orbits a fixed bowl | Fixed spiral hook, rotating bowl and breaker bar |
| Attachments | Beater, whisk, dough hook, plus options | None — the hook is fixed |
| Rated in | Bowl litres | Kilograms — confirm flour or finished dough |
| Dough temperature | More friction heat on long mixes | Gentler on dough temperature |
| Typical home | Restaurant, cafe, patisserie, club kitchen | Bakery, pizzeria, wholesale dough production |
The practical test: if dough is under about a third of your mixing work, a commercial planetary mixer with a dough hook covers it. If dough is the business, buy a spiral mixer for the dough and keep a smaller planetary for everything else — which is why mixers for bakeries are usually bought in pairs. Using a planetary as a full-time bread machine is how gearboxes die young.
Attachments: Beater, Whisk and Dough Hook on a Commercial Food Mixer
Three attachments ship with essentially every commercial planetary mixer, and knowing which does what prevents both bad results and broken machines. This is the practical advantage of a planetary over a spiral mixer, and over a hand mixer or stick blender, which can froth and blend but cannot knead or cream at volume.
- Flat beater (paddle). The workhorse: creaming butter and sugar, cake mixes, mashed potato, pastry, meat mixes — anything combined without being aerated or developed.
- Whisk (balloon whip). Air only — cream, egg whites, meringue, sponge batters, mayonnaise. Never whisk dough; a stiff mixture bends or snaps the wires.
- Dough hook. Kneading, within the machine's stated dough rating — usually well below the bowl's rated litres, because dough is the heaviest load the machine will ever see.
Optional accessories differ by model — bowl scrapers, extra bowls, mincer or vegetable-prep drives off a hub, a timer and digital controls — so check the model rather than assume. Two questions beat the accessory list: does it take a second bowl, so one batch rests while the next is mixed, and is that bowl a size your section already stocks spares for?
Duty Cycle and Drive: Why Some Food Mixers Die Early
Capacity tells you what a machine can mix once. Duty cycle tells you how often it can do it, and it is what separates commercial mixers built for busy commercial kitchens from light-duty food mixers. A mixer specified for intermittent use — mix, rest, mix — will overheat if it is run back-to-back for a morning dough production, and thermal cut-outs tripping mid-batch are the first symptom that the machine is undersized for the schedule rather than the batch.
Three things separate heavy-duty machines from the rest. Gear-driven transmissions handle sustained dough loads better than belt drives, which slip under a heavy hook. Metal gears in an oil bath outlast plastic. And a motor with real headroom above your usual load runs cooler and lasts longer than one that meets its rating only on paper.
Speeds matter too. Most commercial planetary mixers offer three speed settings — slow for dough, medium for beating with the beater, fast for whisking — and you change between them with the machine stopped unless the manufacturer allows shifting under load. Larger spiral mixers often add a two-speed or variable frequency drive arrangement so the first mix runs slow to hydrate the flour before the development stage. Confirm the bowl guard and interlock too: it is a safety requirement in any commercial kitchen and the interlock switch is a common failure point, so ask what a replacement costs.
Benchtop vs Floor-Standing Commercial Stand Mixers, and the Power Supply
Small capacities are countertop machines and larger ones stand on the floor. The crossover point is worth planning around, not discovering on delivery day.
A benchtop commercial stand mixer in the 5 litre to 20-litre range suits a cafe, a small kitchen or a prep bench where it can live permanently. It still needs a stable surface — these machines are heavy and they walk if the bench flexes — plus clearance above for the bowl to be lifted out. A floor-standing machine from roughly 20 to 30 litres upward brings its own weight distribution and usually a bowl lift rather than a tilting head, which matters because a full 40-litre bowl of dough is not something one person should be lifting.
On power, do not assume. Smaller benchtop commercial mixers generally run from a standard single-phase 240 V outlet, but larger floor units may need a higher-rated circuit or a three-phase supply — an electrician's job to confirm before the machine arrives, not after. Read the data plate or specification sheet for the voltage, phase and current draw of the model you are buying, then check the circuit it will sit on. Measure the doorway and the lift too: floor-standing mixers routinely weigh more than two people can carry.
Matching Capacity to Daily Output in a Busy Commercial Kitchen
Work backwards from what you sell, not forwards from a budget. Four steps, ten minutes with a calculator.
- Count the daily output of each mixed product — pizza bases, loaves, cake portions, litres of cream.
- Convert to weight or volume per item from your recipes. Two hundred pizza bases at 250 g is 50 kg of dough a day.
- Divide by the mixing windows you have. If that 50 kg is mixed in one two-hour morning window and a batch takes roughly 15 minutes plus handling, you have four to six realistic batches — call it 10 kg of finished dough per batch.
- Convert to the maker's rating basis before you shop. Ten kilograms of finished dough at 65% hydration is about 6 kg of flour — so a flour-rated machine needs 6 kg and a finished-dough-rated machine 10 kg for the same job.
| Operation | What usually drives the size | Typical shape of the answer |
|---|---|---|
| Café with light baking | Cream, batters, dressings, some dough | One benchtop planetary mixer, 10 to 20 litres, on the countertop |
| Restaurant with a pastry section | Creaming and whisking volume, not dough | Planetary sized on the biggest single batch, plus a spare bowl |
| Pizzeria | Kilograms of pizza dough per service and mixing windows | Spiral mixer sized on dough per batch; planetary kept for sauces and desserts |
| Bakery or wholesale dough | Flour throughput in commercial bakeries, batches per hour | Spiral mixer as the primary machine, plus a planetary alongside |
Two final sanity checks. Size for your busiest day and projected growth, not today's average — a commercial mixer is a five to ten-year purchase, and moving up a size later costs far more than buying it once. But do not oversize blindly: an oversized bowl will not mix small batches properly, the failure mode nobody warns you about. High-volume commercial production justifies a large machine for bulk work plus a small one for fine work; one compromise machine rarely does both. You will find both formats in our commercial planetary mixers and commercial spiral mixers ranges, alongside the rest of the commercial kitchen equipment catalogue.
Frequently Asked Questions
Which mixer is best for commercial use, planetary or spiral?
It depends on what dominates your mixing. A planetary mixer is the general-purpose choice: swap between beater, whisk and dough hook to cover creaming, whipping, batters and moderate dough. A spiral mixer does only dough, but develops it faster, handles heavier batches and adds less friction heat. If dough is under about a third of your work, choose planetary; if dough is the business, buy a spiral and keep a small planetary for everything else.
What size commercial mixer do I need?
Work backwards from daily output. Convert what you make into kilograms of dough or litres of batter per day, divide by the number of realistic mixing windows, and size on the largest single batch rather than the daily total. Then allow headroom: plan on about two-thirds of a planetary mixer's rated bowl litres as a workable batch, and less for anything whipped, because aerating jobs roughly double in volume.
Does a 20 kg mixer mean 20 kg of flour or 20 kg of dough?
Either, depending on the manufacturer, which is why this is the most misread spec in the category. A flour-weight rating means 20 kg of dry flour, which at 65% hydration produces roughly 33.6 kg of finished dough. A finished-dough rating means 20 kg out of the bowl, which is under 12 kg of flour. Always ask the supplier which basis the number uses before you compare two machines.
Can a planetary mixer knead bread dough?
Yes, within its stated dough rating and with the dough hook fitted. That rating is normally well below the bowl's litre capacity, because dough is the heaviest load the machine will see. Running a planetary at or past its dough limit repeatedly is the fastest way to wear out a gearbox, so a kitchen kneading dough all morning every morning is better served by a spiral mixer.
Do commercial mixers need three-phase power?
Not always. Smaller benchtop commercial mixers generally run from a standard single-phase 240 V outlet, while larger floor-standing machines may need a higher-rated circuit or a three-phase supply. Never assume from capacity alone: read the voltage, phase and current on the model's data plate or specification sheet, and have an electrician confirm the circuit before delivery rather than after.
