How to choose a food dehydrator

Most people choose a dehydrator by price and regret it in either direction: a machine too small to finish a day’s produce, or one that spends the year holding four trays. The useful question is not "which is the best one" but "what does one batch look like for me, and how often will I run it".

Start with one batch, not with the price

Weigh what you actually want to dry in a single run, fresh. Fruit loses roughly seven-eighths of its weight, so eight kilograms of sliced mango leaves about one kilogram of product — but it is the fresh volume that has to fit on the trays, not the dried.

A 12-layer cabinet holds roughly 4–6 kg of sliced fruit and suits a household or a home business running a few batches a week. A 20-layer suits a shop or a caterer running most days. A 32-layer only earns its floor space if you are drying daily and selling the output.

Temperature range and whether it holds

A range of 30–90 °C covers everything you are likely to dry: herbs at the bottom, fruit at 55–60 °C, meat at the top. The number on the dial matters far less than whether the thermostat holds it. A cabinet that overshoots by ten degrees will case-harden fruit — a dry shell over a wet centre — and you will not find out until the bag spoils two weeks later.

Airflow, and why tray position matters

Horizontal airflow from a rear fan moves air across every tray at roughly the same rate. Even then the trays nearest the fan finish first, which is why rotating them once around the halfway point is standard practice rather than a sign of a fault.

Stainless steel trays matter more for meat than for fruit: they take a hot wash and do not hold the smell of the last batch.

What to check before you buy

• Tray count against one real batch, weighed fresh.

• Whether the thermostat holds its setting, not just the range printed on the box.

• Whether spare elements, fans and controllers are held locally — an imported part is a month of downtime.

• The warranty, and what it actually covers. Ours is 12 months on the element, fan and controller.

Honestly, when not to buy one

If you are drying a few kilos of chillies each summer for your own kitchen, a charpai and a muslin sheet will do it and cost nothing. A cabinet starts to pay when the output is for sale, when the weather is against you, or when a failed batch costs more than the electricity to run it properly.