TillioBargain hunting · Kitchen
Ninja AF400UK, AF451UK or AF500UK: compare the right air fryer deal
A cheaper Ninja air fryer is useful only if its drawers fit the way you cook. AF400UK, AF451UK and AF500UK are different purchases, even when a retailer groups them under 'large dual-zone air fryer'. Choose the layout and features first, then track the full model code across shops.
By Tillio editorial · Sources checked
Two separate drawers, or one drawer with a divider?
Ninja's UK specifications describe AF400UK as a 9.5-litre appliance with two separate cooking drawers. AF451UK also has 9.5 litres across two drawers and adds a digital cooking probe. AF500UK has a single 10.4-litre drawer with a removable divider: use two zones or remove it for one larger cooking space. These are manufacturer specifications, not results from Tillio kitchen testing.
That makes the question more useful than simply asking which has the most litres. If you regularly want to lift out one drawer while leaving the other in place, look closely at the separate-drawer layout. If a larger tray or joint is your reason for buying, check the usable internal space with the divider removed. Total capacity alone does not establish that your favourite baking dish will fit.
Sources: SharkNinja UK: Ninja AF400UK · SharkNinja UK: Ninja AF451UK · SharkNinja UK: Ninja AF500UK
Give the probe a job before paying for it
AF451UK's included probe is the clearest distinction from AF400UK in this comparison. Decide whether temperature monitoring is something you will use, rather than valuing it only because the model originally carried a higher reference price. Read the operating instructions for the foods and cooking modes you intend to use.
Illustrative prices, not live offers: AF400UK is £150 delivered and AF451UK is £170 delivered. The probe model costs £20 more. If you would not use that feature, the cheaper suitable model is still a sensible choice. If another checked retailer sells AF451UK for £145 delivered, it becomes cheaper as well as offering the feature. Model hierarchy does not decide today's price order.
Sources: SharkNinja UK: Ninja AF451UK
Check the kitchen and the box
Measure the space where the unit will operate and where you will open or remove the drawer. Use the exact model's manual for ventilation clearances; a retailer dimension field could describe packaging or be incomplete. Also think about washing and storing the drawer. A larger appliance that cannot be used comfortably is poor value even at an unusually low price.
Read the included-parts list for the selected offer. A promotional liner or tray has value only if you want it and it fits the model. Treat accessories as a separate line in your comparison, and check whether the listing is new, refurbished or an accessory-only replacement. A photograph of the whole unit is insufficient evidence.
Track a model, not an air-fryer family
Save the complete UK model code and your delivered-price target. Compare that model's current stock, delivery, seller and condition before relying on a deal badge. Use observed history for the same listing; a drop on AF400UK says nothing about AF500UK's earlier price. If the option you prefer is unavailable, compare a different model as an alternative choice and show the feature difference openly.
- Choose the drawer layout you need.
- Decide whether the probe changes your purchase.
- Confirm usable space and manual clearances.
- Compare the exact model and delivered total.
Sources and method
Prepared with AI-assisted desk research and checked against the linked primary sources. Retailer terms can change; read the current terms for your exact order. Read our checking and editorial method.