Buy a planetary mixer if you mix a bit of everything, from batters and whipped cream to moderate batches of dough. Buy a spiral mixer if dough is the main job, especially bread and pizza. Size either one from the manufacturer's dough capacity chart for your recipe, not from the bowl volume.
Key takeaways
- A planetary mixer is the versatile choice: interchangeable beater, whip and hook, plus an attachment hub on many models.
- A spiral mixer is built for dough. Its bowl turns with the hook, which develops dough efficiently and puts less heat into it.
- Bowl size is not dough capacity. Stiff, low-hydration doughs cut a mixer's rated capacity sharply, so read the manufacturer's chart at your recipe's hydration.
- Small mixers often plug into a 120 volt outlet; larger floor models often need 208 or 240 volts and some are three-phase, so check your circuit first.
- Freight-shipped mixers are not returnable once delivered in good condition, so confirm voltage, doorways and floor space before ordering.
Planetary or spiral: the decision that matters most
The two designs mix in different ways, and that difference decides almost everything else. In a planetary mixer the bowl stays still while the agitator spins on its own axis and travels around the inside of the bowl, the way a planet orbits the sun. In a spiral mixer a spiral-shaped hook turns in place while the bowl itself rotates, so the dough is folded and stretched continuously as it passes the hook.
A planetary mixer takes a flat beater, a wire whip and a dough hook, so one machine handles cake batter, mashed potatoes, meringue, cookie dough, fillings and moderate batches of bread or pizza dough. A spiral mixer does one job: dough. It cannot whip cream or cream butter and sugar, but it handles large, stiff batches of dough more gently and more consistently than a planetary mixer of similar size.
Most restaurants, cafés, hotels and institutional kitchens that make a little of everything are better served by a planetary mixer. Pizzerias, bakeries and bagel shops that mix dough every day often end up with a spiral mixer, and many bakeries run both: a spiral for bread and a planetary for everything else.
- Choose planetary for batters, icings, whipped products, mashed vegetables, mixed menus and occasional dough.
- Choose spiral for daily bread, pizza, bagel and other yeasted doughs in volume.
- Choose both for bakeries and pizzerias that also make desserts, sauces or fillings.
Sizing: quarts, litres and real dough capacity
Mixers are named by bowl volume. North American makers usually give it in quarts and most European makers give it in litres. One US quart is just under a litre, so a 20-quart bowl holds roughly 19 litres. Spiral mixers are also often rated by the weight of dough or flour they can handle per batch, which is the more useful number for a baker.
Bowl volume tells you how much batter or whipped product fits. It does not tell you how much dough the mixer can knead, because dough loads the motor and gears far harder than batter does. Manufacturers publish capacity charts that list the maximum batch for each type of product, and the dough figures are well below what the bowl could physically hold.
Size from your largest regular batch, not your average one, and leave headroom. A mixer run at its limit every day wears faster, and a batch that is too big for the bowl does not mix evenly. If your volume is growing, buying one size up is often better than splitting every batch in two. As a rough guide to how the sizes are used:
- Countertop sizes, roughly 5 to 12 quarts: cafés, pastry stations and small batches.
- Bench or floor models around 20 quarts: the common all-purpose size for restaurants.
- 30 to 40 quarts: high-volume restaurants, commissaries and institutional kitchens.
- 60 quarts and up: bakeries, large institutions and central production kitchens.
Hydration and duty: why stiff dough changes the answer
Hydration is the weight of water in a dough divided by the weight of flour, expressed as a percentage. A wet dough is easy work for a mixer. A stiff, low-hydration dough, such as bagel dough or some pizza doughs, makes the motor and transmission work much harder, so manufacturers reduce the rated dough capacity as hydration falls, often by a wide margin.
Work out the hydration of your stiffest dough before you shop, then read the capacity chart at that figure. If the chart assumes a wetter dough than yours, the real capacity for your recipe is lower than the headline number. Sizing a planetary mixer for pizza from bowl volume alone is a common mistake with these machines.
Duty is the other half of the question. A mixer that runs a few batches a week is in a different class from one that runs dough every morning and batters every afternoon. Ask how many batches of your largest recipe the model is designed to handle per day, how long each batch takes, and whether the manufacturer rates it for that kind of continuous use.
On a planetary mixer, manufacturers typically restrict stiff dough to low speed, and the manual or capacity chart says which speeds each product may use. Running stiff dough faster than the manual allows strains the transmission, and damage from misuse is generally excluded from manufacturer warranties. Spiral mixers typically offer two speeds: the low speed to bring ingredients together and the high speed to develop the dough.
Features and attachments worth paying for
Beyond size, a few features separate a mixer that suits your kitchen from one that fights it. Check what ships with the machine before comparing prices, because some models include a full set of agitators and others list them as accessories.
An attachment hub is useful for occasional grinding or slicing, but it is not a substitute for a dedicated grinder or vegetable prep machine in a kitchen that does those jobs every day.
- Agitators: a flat beater, wire whip and dough hook on a planetary; a spiral mixer has only its spiral hook.
- Attachment hub: many planetary mixers have a front hub that drives a meat grinder, vegetable slicer or shredder. Confirm the hub size matches the accessory before ordering it.
- Transmission: gear-driven machines hold speed under load; variable-speed designs allow fine control but differ in how they handle heavy dough, so read the capacity chart.
- Timer and controls: a digital timer with automatic shut-off makes batches repeatable from one shift to the next.
- Bowl handling: on larger planetary mixers, a bowl lift and a bowl dolly save strain; on spiral mixers, a removable bowl makes emptying and cleaning easier than a fixed one.
- Safety guard: most current commercial mixers have a bowl guard interlocked with the motor, so the mixer stops when the guard is opened.
Power, space and delivery
Small countertop mixers commonly plug into a standard 120 volt outlet. Larger floor models often need a 208 or 240 volt circuit, and some are three-phase only. Check the voltage, phase, amperage and plug type on the specification sheet against the circuit you actually have, and have an electrician confirm it before you order.
Measure the spot and the path to it. Floor mixers are heavy and tall, so check the overall height, room in front to lower and roll out the bowl, and the doorways, halls and elevators on the way in.
Floor mixers ship by freight carrier. A liftgate, a delivery appointment or inside delivery has to be arranged with Norpex before paying, and every freight delivery should be inspected before you sign, with any damage noted on the delivery receipt and reported to Norpex the same day.
Special-order and freight equipment is not returnable once it has been delivered in good condition, which is one more reason to confirm voltage and fit first. For larger or configured machines, ask for a quote: a person prices it with freight included, and quotes come back within one business day.
Cleaning, maintenance and common mistakes
Daily cleaning is simple. Remove the bowl and agitator, wash and sanitize them, and wipe down the head, column and bowl guard with a damp cloth. Do not hose down or submerge the mixer body, and check the manual before putting agitators in a dishwasher, because some aluminum agitators discolour or corrode in dish machine detergents.
Maintenance is mostly about the transmission. Follow the manufacturer's schedule for lubrication and service, pay attention to new noises, and replace a cracked whip, a bent hook or a damaged bowl guard promptly. A broken whip wire in a batch is a foreign-object problem as well as a repair.
New equipment sold by Norpex carries the manufacturer's warranty, passed through in full, and terms vary by manufacturer and product line. If a claim is needed, send Norpex the model number, serial number, install date and order number, and Norpex opens the claim with the manufacturer. The mistakes that most often lead to early repairs are these:
- Sizing a planetary mixer for pizza from bowl volume instead of the dough capacity chart.
- Mixing stiff dough on a planetary mixer at a higher speed than the manual allows.
- Buying a spiral mixer for a menu that also needs whipping and creaming.
- Ordering a three-phase model for a building with single-phase power.
- Overfilling the bowl to save a batch, which strains the gears and mixes unevenly.
Common questions
What size mixer does a small restaurant need?
- A 20-quart planetary mixer is a common all-purpose size for a small to mid-size restaurant. Size from your largest regular batch using the manufacturer's capacity chart for that product, and go larger if you mix stiff dough often.
Can a planetary mixer make pizza dough?
- Yes, in moderate batches and at the low speed the manual specifies. Pizza dough is often stiff, so the real capacity is well below the bowl size. If you mix dough daily in volume, a spiral mixer is usually the better tool.
Should a spiral mixer have a fixed or removable bowl?
- A fixed bowl is part of the machine, so dough is lifted out by hand. A removable bowl comes out of the machine for emptying and cleaning, which helps with large batches, but it adds cost and mechanism.
How do I convert mixer quarts to litres?
- One US quart is about 0.95 litres, so multiply the quart size by 0.95. A 20-quart bowl is about 19 litres, and a 60-quart bowl is about 57 litres.
Do commercial mixers need a special electrical circuit?
- Small countertop models usually plug into a standard 120 volt outlet. Larger floor models often need 208 or 240 volts and some are three-phase, so check the specification sheet against your panel with an electrician before ordering.