How to Use a Countertop Oven as a Dehydrator

The short answer

Two ovens in this catalog publish specifications that make drying genuinely possible: the Our Place Wonder Oven Pro, which publishes a floor of 80°F and a timer Our Place states runs from 30 seconds to 24 hours, and the Breville Joule Oven Air Fryer Pro (BOV950), which publishes a band of 80–480°F. Everything else either publishes a floor too high, a timer too short, or no figures at all — whatever the dial says.

That is the whole guide in one paragraph, and the rest of this page is why a Dehydrate button is not evidence.

The two numbers that decide it

The floor. Drying works by moving warm air across food for hours without cooking it. Holding a low set point is harder for an oven than getting hot, because a thermostat at the bottom of its range is switching a large element on and off against a small demand. An oven whose published floor is 200°F is not a dehydrator with a different label on it; it is an oven that bakes slowly.

The timer. Drying is measured in hours. An oven whose timer stops at 60 minutes cannot do it unattended, and restarting a cycle every hour for eight hours is not a workflow.

Here is where every oven in this catalog that publishes either figure actually lands.

The finding: the button and the numbers come apart

Four ovens in this catalog carry a named Dehydrate mode. Only one of those four also publishes both a low floor and a long timer. The Toshiba ChefFry publishes a twelve-function list including dehydrate and proof, and publishes neither a temperature range nor a timer ceiling we could find — so the label is the entire specification.

Meanwhile the Nuwave Bravo XL Pro publishes the lowest floor of anything here — 50°F, in 5°F increments — and does not carry a Dehydrate label at all. On published information it is better equipped for the job than three of the four ovens that advertise it. We cannot tell you what its timer ceiling is because Nuwave does not publish one.

This is why the standard Our Place Wonder Oven is such a clean illustration. Its published floor is 200°F and its timer stops at 60 minutes, and no mode on the knob changes either figure. The Pro, which looks like the same appliance, publishes 80°F and 24 hours — and that single pair of numbers is the entire functional difference between an oven that can dry and one that cannot. The Pro review goes through both specifications.

What a long, low cook costs to run

This is the part that surprises people, and it is arithmetic rather than opinion. Drying is cheap per hour and expensive per session, because the session is long. An oven holding a low set point draws nothing like its rated wattage continuously — the thermostat is cycling — but it is still on for eight or ten hours.

We publish the per-hour figure for every oven whose maker publishes a wattage, with the electricity rate exposed so you can redo it with your own: air fryer oven electricity use and convection oven electricity use. Multiply the hourly figure by the hours and treat the result as a ceiling rather than an estimate, because a cycling thermostat at 80°F is not drawing full power.

What we will not do is publish a drying time or a temperature for any food. We have dried none, and a figure we cannot source is a figure we do not print. Use the guidance that comes with your own oven and with whatever you are drying.

Practical points that are published

Airflow matters more than heat. Drying removes water, and water leaves with the air. That is the one argument for using the convection fan here rather than switching it off. What the fan is actually doing.

Trays, not a pan.Food needs air on both sides, which means a wire rack, and the number of rack levels is a published figure on several ovens here — four on the Nuwave, three on the Wonder Oven Pro, eight rack positions in Breville's book for its larger models. The published rack maps are here.

Ten hours is ten hours of an appliance running unattended.Nuwave's manual says never leave the oven unattended during use, and both Nuwave and Our Place publish automatic shut-offs that may interrupt a long cycle. Read your own manual before you plan an overnight run — it is the single most relevant document and it is free.

If dehydrating is a real priority rather than an occasional one, the ovens with a dehydrate function are ranked here and the ranking states the same documentation gap this page does.