Every dehydrator is a heater and a fan. The difference that matters is where the fan sits. Missouri Extension calls horizontal airflow, from a rear fan, "the best system," because vertical airflow is easily blocked by the trays and needs rotating for even drying.
Side by side
| Shelf (rear fan) | Stackable | |
|---|---|---|
| Fan | Rear wall, blows across trays | Top or base, blows through the stack |
| Even drying | Every tray at once | Trays nearest the fan dry first |
| Tray rotation | Not needed | Every few hours |
| Tray shape | Square, fits strips and leather | Round, with a center hole |
| Expandable | No | Often, up to 12 or 30 trays |
| Price | About $160 to $550 | About $65 to $180 |
| Our pick | Cosori Premium | Nesco Snackmaster Pro |
Even drying
In Food Network's test, the Nesco Snackmaster Pro's results were uneven on racks farther from the blower, while every item in the Cosori shelf model came out even. Oregon State Extension recommends rotating trays every few hours, which matters most with stackers.
Tray shape
Square trays fit long jerky strips and make neat fruit leather. Round stacker trays have a center hole that limits both.
Price and space
Stackers cost less and store small. Shelf models sit on the counter permanently; the Cosori Premium is 13.4 × 17.8 × 12.4 in.
Which to buy
You'll dry regularly, make jerky or fruit leather, and want to set it and walk away.
You're on a budget, short on storage or just trying dehydrating.
