The £30 Appliance That Wins: Why Price Per Wear Beats Price Per Feature in Your Kitchen

Borrowed from fashion, where it makes intuitive sense: a £90 coat worn twice a week for three winters is cheaper per outing than a £25 jacket that lives in the wardrobe. The same sum works on kitchen worktops, and it's far more brutal than the label price.

Because a kitchen appliance doesn't just cost what you paid for it. It costs the electricity every time you switch it on, the worktop space it occupies, and — the killer — the number of times it stays in the cupboard instead.

So let's do the comparison properly, using the two gadgets that divide British kitchens: the air fryer and the slow cooker.

The energy numbers, without the marketing

Electricity is sitting at roughly 25p per kilowatt-hour on most standard variable tariffs. Your exact rate will differ, but the ratios hold.

• Air fryer (1,500W, 18 minutes): about 0.45 kWh, so roughly 11p a session.
• Slow cooker (160W on low, 7 hours): about 1.1 kWh, so roughly 28p a session.
• Electric oven (45 minutes at 200°C): about 1.5–2 kWh, so roughly 40–50p a session.
• Microwave (900W, 8 minutes): about 0.12 kWh, so around 3p.

Straight away, two things are true. The air fryer is the most efficient way to cook something in bulk-heat terms — it's a small box, it preheats in three minutes, it doesn't heat a cavity big enough for a chicken. And the slow cooker is still dramatically cheaper to run than the oven it usually replaces, because seven hours at 160 watts is less electricity than forty-five minutes at full tilt.

That 28p versus 11p gap sounds like the end of the argument. It isn't, because we haven't counted the purchase price yet.

The number nobody puts on the box

Suppose the air fryer cost £300 and gets used four times a week. Over three years that's 624 sessions, so the hardware costs 48p every time you cook. Add 11p of electricity and you're at 59p per meal before a single chip goes in.

Now the slow cooker: £30, used three times a week, 468 sessions over the same three years. That's 6p of hardware per meal. Add 28p of electricity and you land at 34p.

The £300 machine is twice as expensive per meal as the £30 one, despite being three times more efficient on the meter. Purchase price per use is the biggest line item in the whole calculation, and it's the one we completely ignore in the shop.

The hidden variable: how often you actually use it

Everything above assumes the gadget gets used. This is where the arithmetic gets uncomfortable.

Halve the air fryer's usage to twice a week and the hardware cost per meal jumps to 96p. Use it once a fortnight — which is roughly how often the average neglected kitchen gadget gets an outing — and you're looking at more than £7 per meal before you've peeled anything.

And there's a second-order cost that never appears in these calculations: a gadget you don't trust is a gadget you don't cook with, and a kitchen you don't cook in is a kitchen where the takeaway app wins. A £30 slow cooker that gets used three times a week quietly saves more than a £300 machine that intimidates you, because the alternative to the slow cooker isn't nothing — it's a £22 delivery order.

Why cheap food loves a slow cooker

The slow cooker's real advantage isn't the electricity. It's what it does to the price of ingredients. It turns the cheapest things in the shop — dried lentils, split peas, chickpeas, stewing steak, chicken thighs, root vegetables — into food you'd happily eat twice.

That's a different kind of saving, and it compounds. A lentil and vegetable stew costs maybe 60p a portion in ingredients. The same meal made with a shortcut tin and a jar of sauce is three times that. Deliberately boring appliances tend to push you towards deliberately boring ingredients, and boring ingredients are where the margin is.

Where the air fryer genuinely earns its keep

It would be dishonest to pretend the £300 machine is rubbish. If you have a household of four and you're reheating, roasting and crisping something most days, it pays for itself in avoided oven use and avoided Deliveroo. It's brilliant for a single portion of something that would otherwise mean heating a whole oven for one person.

So do this: if you already own one, the £300 is spent. The sunk cost is sunk, and the marginal cost of using it is 11p. Use it. Use it constantly. An appliance used daily is cheap no matter what it cost.

The ten-minute kitchen audit

Before you buy anything else, count. Open the cupboards and work out, honestly, how many times each appliance was used in the last fortnight. Then do the sum: purchase price divided by uses per year, divided again by the number of years you'll realistically keep it. Add the electricity.

Any appliance scoring under about 50p a use is earning its worktop space. Anything over £2 a use is decoration, and decoration belongs on a shelf, not plugged in next to the kettle.

The most valuable appliance in most UK kitchens costs nothing to run and gets used twenty times a day: the kettle, the toaster, the microwave, and a decent knife. Everything after that is a negotiation between how much you spent and how often you'll actually show up.