The Ninja AF300 and AF400 are the two dual-zone air fryers most UK families end up choosing between. Both use the same two-drawer layout, the same six-function control set and the same non-stick, dishwasher-safe drawers. The differences come down to capacity, price, footprint and power. For wider context, see our best air fryers UK 2026 guide.
Weighing up the options? See our round-up of the best air fryers in the UK.
The AF300UK has a 7.6 litre total capacity, split into two 3.8 litre drawers. The AF400UK has 9.5 litres, split into two 4.75 litre drawers. That extra 1.9 litres is what you pay for, and whether it matters depends on how many people you cook for.
Prices below were the lowest found at the time of writing and move often, so check the live listing before buying.
Our top picks at a glance
- Best for most families of four: Ninja AF300UK. Same cooking programmes, smaller footprint and the lower price.
- Best for five or more, and batch cooking: Ninja AF400UK. More room per drawer, so larger joints and bigger batches fit without a second round.
- Cooking for one or two? Neither is essential. A single-drawer or smaller dual-zone model is likely to suit better.
The spec gap: 1.9 litres, a price step and a bigger worktop footprint
| AF300UK | AF400UK |
Total capacity | 7.6 L (2 x 3.8 L) | 9.5 L (2 x 4.75 L) |
Power | 1,690W | 2,470W |
Functions | 6 (air fry, max crisp, roast, bake, reheat, dehydrate) | 6 (same) |
Drawers | Non-stick, dishwasher safe | Non-stick, dishwasher safe |
Lowest price found | £164.99 (Amazon.co.uk, via PriceSpy) | £199.99 (PriceSpy); £230 at Argos |
Best for | Families of four | Families of five-plus, batch cooking |
Cooking results: similar at family size, more headroom on the AF400
Both machines share the same core programmes, so day-to-day results such as chips, chicken thighs and fish fingers should be comparable at family-of-four quantities. The AF400 pulls ahead when you want to cook a lot at once: larger drawers mean bigger batches of chips or a larger cut of meat in one go, where the AF300 may need two rounds. The AF400’s higher rated power also points to quicker heat-up on big loads.
The footprint reality: the real buy decision
Air fryers of this size are bulky, and the AF400 is the bigger unit. Measure the worktop space, allow room behind for ventilation, and check that the drawers can pull fully out under any wall cabinets. If space is tight, the AF300 is the safer choice. If you regularly feed five or more, the AF400’s extra size earns its place.
Noise and energy use
Both units run a fan-driven system and will be audible in an open-plan space. Published figures vary by source, so treat any decibel claim cautiously. On energy, both draw well within the capacity of a standard UK 13A socket, and running costs for typical cook times are modest compared with a full-size oven, particularly when cooking in small to medium batches.
AF300 vs AF400: definitive buy guidance
- Choose the AF300UK if you cook for two to four people, have limited worktop space, or want the lower price.
- Choose the AF400UK if you regularly cook for five or more, batch cook, or want to fit larger cuts of meat.
- Note that Amazon also sells a newer AF451UK variant of the larger model; check the listing to confirm exactly which version you are buying.
For alternatives, see our air fryer vs mini oven comparison, or Instant Pot vs Ninja Foodi.
Ninja Foodi Dual Zone AF300UK 7.6L
The AF300UK is the smaller of the two: 7.6 litres across two 3.8 litre drawers, 1,690W, and six functions. PriceSpy showed Amazon.co.uk at £164.99, with John Lewis listing it at £199.99 elsewhere. It suits households of up to four and kitchens where worktop space is at a premium. Its limit is single-drawer volume: very large batches or bigger joints will not fit as comfortably as in the AF400.
Ninja Foodi MAX Dual Zone AF400UK 9.5L
The AF400UK adds 1.9 litres of capacity, two 4.75 litre drawers and a higher-rated 2,470W element. Prices found ranged from £199.99 (PriceSpy lowest) to around £230 at Argos and ao.com. It is the better fit for larger households, regular hosts and batch cooks, at the cost of more worktop space and a higher price.
Frequently asked questions
Q: Is the AF400 worth the extra money over the AF300?
A: For households of five or more and regular batch cooks, yes. For a family of four the AF300 covers the same programmes at a lower price.
Q: Will AF300 accessories fit the AF400?
A: Not reliably. The drawers are different sizes, so buy accessories listed for the specific model.
Q: Which is better for chips for a family of four?
A: Both handle a family-sized portion. The AF400 is easier when cooking large quantities in one batch.
Q: Can the AF300 cook a whole chicken?
A: The AF300’s drawers are smaller, so a whole bird is a tight fit. The AF400 gives more room; check the manual for weight limits.
Q: Does either unit struggle on a UK 13A socket?
A: No. Both are designed for standard UK sockets.
Q: Is the AF400 the same as the AF451UK?
A: They are closely related larger Ninja dual-zone models sold on Amazon UK under different model codes. Check the listing title before buying.
