Dehydrating for Beginners: Oven or Dehydrator?

Drying is humanity's oldest preservation method – and it's currently making a comeback. No wonder: dried food needs no power for storage, takes up almost no space, and concentrates flavor and nutrients. Here you'll learn which method suits you and how to avoid typical beginner mistakes.

Why Drying Works

Drying removes water from food – and without water, bacteria, yeasts, and mold can't do their work. According to the NCHFP, home-dried fruit should still contain about 20% moisture; vegetables and herbs are dried further, until they snap. Three factors are decisive here: low temperature, air movement, and time.

Method 1: The Oven

The entry point with no new purchase needed – almost any oven can dry food:

• Temperature: low, 40–50 °C according to the BZfE, ideally with fan-assisted (convection) heat
• Important: Leave the oven door slightly ajar (wedge a wooden spoon in it) so moisture can escape – otherwise the food steams instead of drying
• Put parchment paper on the rack, not on a baking sheet (better air circulation)
• Turn the pieces occasionally

Downside: The oven is a power hog. 8 hours of drying time can cost 5–8 kWh depending on the appliance – and the oven is tied up the whole time.

Method 2: The Food Dehydrator

If you dry food regularly, a dehydrator is hard to beat:

• Efficient: Usually 300–600 watts instead of 2000+ for an oven – the same 8 hours cost only a fraction as much
• Even results: A fan and multiple trays keep conditions constant, so nothing needs turning
• Capacity: 4–10 trays at once – ideal for a big apple harvest
• Entry-level models start at about €40–60, good ones with temperature control from around €100

What to look for when buying: adjustable temperature (35–70 °C), rear-mounted fan rather than bottom-mounted (more even drying), BPA-free trays.

Method 3: Air Drying

The zero-energy option – but it only works for certain foods and in dry, warm weather – according to the BZfE in places with at least 30 °C:

• Suitable: herbs (hung upside down in bunches), chilies (strung up), mushrooms in slices
• Not suitable: high-water-content foods like fruit pieces or tomatoes – the mold risk is too high in our climate
• Choose an airy, warm, dark spot – not in direct sunlight (loses flavor)

Reference Values for Temperature and Time

According to the NCHFP, food dehydrators dry at about 60 °C (140 °F), herbs at 35–46 °C (95–115 °F). For the oven, the BZfE recommends 40 to 50 °C with the door slightly open. The times are rough rules of thumb – the food is only done when it passes the doneness test.

The Doneness Test

• Fruit is done when it bends leathery without breaking – and no more juice comes out when you cut it
• Vegetables and mushrooms should be "rattle-dry" and snap
• When in doubt: dry it an extra hour – food that's too moist will grow mold in storage

Conditioning and Storing

After drying comes a step many people skip – conditioning: loosely fill the cooled, dried food into a large jar for 7–10 days, as the NCHFP advises, and shake it once a day. This evenly redistributes any remaining moisture. If the jar fogs up, that batch needs more drying time.

After that: store airtight, dark, and cool – screw-top jars or storage containers in the pantry are perfect. According to the NCHFP, dried fruit keeps for up to a year at about 15 °C (60 °F) and around six months at about 27 °C (80 °F); vegetables only about half as long. Check regularly that everything is still dry – throw away anything mouldy. Don't forget to label – in the app's pantry section you can log your jars with the date right away.

Conclusion

For getting started, the oven is completely sufficient – try it with a tray of apple rings. Once the drying bug bites you (and it will), a dehydrator pays off after just a few batches: more efficient, more even, and it frees up your oven while it works. And the best part: your pantry shelf gains a whole new category.

Sources

• National Center for Home Food Preservation (NCHFP), University of Georgia: Packaging and Storing Dried Foods, accessed 5 Oct 2026
• German Federal Centre for Nutrition (BZfE): Getrocknete Leckereien, accessed 5 Oct 2026
• National Center for Home Food Preservation (NCHFP), University of Georgia: Food Dehydrators, accessed 5 Oct 2026
• National Center for Home Food Preservation (NCHFP), University of Georgia: Drying Herbs, accessed 5 Oct 2026

The sources support individual statements in this article. The organisations named have neither reviewed nor endorsed it.