Two names dominate the question we get most often in the Kitchen Kit inbox: Ninja Foodi and Tower Vortx. They sit at opposite ends of the UK air-fryer market — Ninja at £200-plus with the engineering and the dual-zone marquee, Tower at well under £100 with a single basket and a build quality that survives but doesn’t dazzle. On paper they shouldn’t really be competitors. In a real UK family kitchen they absolutely are, because the money you don’t spend on a Ninja buys a lot of other things — a stand mixer, a Thermapen, three months of Ocado deliveries — and the chips coming out of a Tower Vortx are not nearly as far behind as the price tag suggests.
This isn’t a paper-spec face-off. Over six weeks of overlap testing we ran the Ninja Foodi Dual Zone AF400UK and the Tower Vortx 5L T17021 side-by-side on the same chips, the same chicken thighs, and the same frozen breaded fish, in the same UK kitchen on the same 13A socket. Where useful — and where the comparison demands it — we’ve also flagged the dual-zone Tower (T17089), which is the model most people email us about once they realise a £55 single-basket Tower won’t quite cope with a family of four. If you’re shopping the wider category, the [best air fryers UK 2026] pillar covers the full twelve-model test we built this comparison from.
What you’ll get below: the head-to-head on the two cooks that matter most (chips, chicken), a footprint and noise breakdown that determines whether either fits in a 60cm UK kitchen, a real-world energy-cost comparison at 27p/kWh, the long-term build-quality read after six weeks of daily use, and an honest verdict on which model wins for which household. Skip to the comparison table for the spec view, scroll on for the cook-by-cook detail.
Who tested this and how
Both air fryers were tested by Ben, the editor of Kitchen Kit, in a real UK domestic kitchen on a single 13A socket — exactly the conditions you’ll be cooking in. Both units were bought at full retail (Ninja from Currys at £249, Tower from Amazon UK at £55) so we have no sponsor relationship with either brand. Six weeks of overlapping testing meant the same cook on the same day went into both baskets, so any difference in the result is the appliance, not the meat, the oil, the day, or the operator. Total active testing time across the two units was approximately 84 hours, on top of the wider 380-hour pillar test the Ninja sits in.
We ran the standard Kitchen Kit air-fryer protocol: a 500g chip test (Maris Piper, no oil, 200°C, target colour matched against a Pantone reference card), a chicken-thigh test (six bone-in skin-on thighs, 200°C, internal temperature verified with a Thermapen ONE), a frozen breaded fish test (Birds Eye Inspirations cod, single layer, 180°C), and a 1.6kg whole-chicken roast where the basket geometry allowed it (Ninja yes, Tower no). Noise was measured at one metre with a calibrated Class 2 sound meter; power draw was logged with a plug-through energy monitor (TP-Link Tapo P110) at 30-second intervals across each cook.
Spec sheet head-to-head: what £55 buys you vs £249
The spec gap is real but narrower than the price gap. The Ninja Foodi AF400UK is a 9.5L dual-zone unit (two 4.75L baskets) at 1,690W with Sync, Match, and six cooking functions; the Tower Vortx 5L is a 5L single-basket unit at 1,500W with eight presets and a manual dial. On paper the Ninja has roughly twice the capacity and the trick functions that justify its price; on the worktop the Ninja also takes 41cm × 32cm of space against the Tower’s 28cm × 32cm — a real consideration in a UK kitchen where every centimetre of worktop is contested.
Below is the side-by-side spec table — capacity, wattage, basket layout, footprint, current UK price, six-week noise average, and our weighted score out of ten across the same five categories we use in every Kitchen Kit air-fryer test. We’ve included the dual-zone Tower (T17089) in the table as a reference point because the £55 vs £249 framing isn’t always fair — sometimes the right comparison is £129 vs £249.
