Gravity vs. Pressure (Pump) Soft-Serve Machine
Short answer: Gravity-fed machines drop mix from the hopper by gravity — simpler, fewer parts, and easy to clean, with good overrun for most shops. Pressure (pump/air) fed machines inject air for higher overrun (lighter product, more servings per mix) and sustained output at peak, at the cost of more parts and cleaning. High-volume operations lean pressure.
| Dimension | Gravity-fed | Pressure / pump-fed |
|---|---|---|
| Overrun (yield) | Good, fixed by the machine | Higher and adjustable — more servings per mix |
| Product texture | Denser, richer | Lighter, drier, taller curl |
| Parts & cleaning | Fewer parts, simplest to clean | Air pump + more parts to clean daily |
| Output at peak | Great for low-to-moderate volume | Sustains high volume better |
| Best for | Cafés, moderate volume, simplicity | High-traffic shops maximizing yield |
Frequently asked questions
What is overrun in soft serve?
Overrun is the air whipped into the mix, which makes the product lighter and increases how many servings you get per gallon. Pressure/pump machines add air for higher, adjustable overrun; gravity machines have good but fixed overrun.
Is a gravity or pressure machine easier to clean?
Gravity — it has fewer parts and no air pump, so daily breakdown and sanitizing are simpler. Pressure machines yield more product but add cleaning labor.
Which makes more money?
A pressure machine's higher overrun stretches each mix into more cones, which can improve margin at volume; a gravity machine is cheaper to buy and run for a smaller shop.