Ninja Double Stack XL Review UK 2026
Quick verdict
Score: 7.7/10
Best for: Faster, lower-oil everyday cooking and reheating, cooking two foods at once
Not for: Large family roasts and big-batch cooking, where a full-size oven still wins on capacity
Bottom line: A practical air fryer (9.5L, dual zone, 6 functions) that crisps food fast with little oil and costs less to run than an oven.
Overall, the Ninja Double Stack XL is a dual-drawer, vertical air fryer built to cook two meals at once, using a 9.5L capacity split between two drawers. It is a space-saver thanks to vertical stacking, and it supports batch cooking with independent cooking in each compartment. With 6 cooking functions and up to 8 portions, it suits family meals, though the separate drawers require careful portioning and spacing to fit food properly. As a best The Ninja air fryer option, it is aimed at buyers who want simultaneous cooking and portion control.
Key specifications
| Spec | Value Notes |
|---|---|
| Capacity | 9.5L Not specified per drawer |
| Zones | 2 drawers Dual-zone cooking |
| Functions | 6 Count only |
Pros
- 9.5L capacity
- Dual zone - cook two foods at once
- 6 cooking functions
- Faster and cheaper to run than a full-size oven
Cons
- Takes up worktop space (dual-zone models are bulky)
- Cooks smaller batches than a full-size oven
- Some foods still need a light spray of oil to crisp up
Capacity and Size
Capacity and size on the air fryer are set up for batch cooking, and it is listed with a 9.5L capacity. The unit uses a vertical, dual-drawer layout, so two separate compartments share the same overall footprint, which can save counter space as well as compared with single, larger baskets. Each drawer supports cooking at multiple levels (4 cooking levels, with 2 racks), which can help when portioning food, like chips plus chicken. The vertical stack can also mean less accessible height for tall items. Not stated how much usable space there is per item size.
Cooking Performance and Functions
The Ninja uses a vertical, dual-drawer cooking design, allowing food to be prepared across two drawers with 4 cooking levels. It includes 6 cooking functions, covering options such as crisping, roasting and re-heating, with performance dependent on food cut size and spacing. The 9.5L capacity is designed for up to around 8 portions, supporting larger batches than smaller fryers, while the layered layout helps manage thicker items without additional accessories. Dense or tightly packed loads can cook unevenly, since airflow and heat circulation rely on spacing within the drawers.
Single or Dual Zone
Because the air fryer is a dual-drawer air fryer, it uses a dual zone layout where each drawer can cook separately. This lets one drawer handle one food while the other prepares a different option, reducing flavour mixing. The unit has a total capacity of 9.5L, split across two drawers, and it includes 2 racks for layering within each zone. It supports 4 cooking levels, which can be used alongside separate drawer operation. The trade-off is that larger items may need fitting, and the zones still share one appliance footprint.
Ease of Use and Controls
Ease of use is shaped by the dual-drawer design, where each drawer can be operated separately so preparation stays organised while the unit follows a day-to-day workflow. Each drawer supports separate cooking, which suits different foods or timings, but it requires basic planning to align progress across both drawers. The unit is positioned as vertical space saving, but safe access requires clear room to open both drawers fully. Cooking levels and functions guide the settings, and a simple start sequence helps reduce confusion. Controls are approachable, but consistent results may take a few attempts for beginners.
Cleaning and Maintenance
Cleaning and maintenance for this air fryer are designed around its dual-drawer, two-rack layout, which keeps day-to-day upkeep straightforward once a routine is in place. After cooking, the unit should be left to cool fully before cleaning. The drawers should be pulled out carefully. Grease and crumbs can be wiped from the drawer baskets and racks, then washed using warm soapy water, with thorough drying afterwards. Stuck-on residue can be loosened with a non-abrasive sponge, while metal scourers should be avoided to prevent surface wear. The main unit should be wiped with a damp cloth only.
Noise and Energy Use
Noise and energy use can vary depending on what is being cooked, as the Ninja Double Stack XL uses a dual-drawer setup with separate drawers and racks that can operate at different times. When both drawers heat simultaneously, the unit may sound busier than when only one zone runs. After start-up, fan-driven airflow will likely create a steady background sound. Preheating should be used only when needed.
Who Is This Air Fryer For?
Who is the Ninja best suited for? It is designed for households that cook for several people, with a 9.5L total capacity and two drawers that support batch cooking. The dual-zone arrangement is intended for cooking different items at the same time without mixing flavours, such as chips and chicken. Its space-saving, vertical design includes 4 cooking levels per drawer, which suits buyers who prefer an oven-style, organised layout. Any buyers with very small kitchens or limited prep space may find the large air fryer awkward.
Where to Buy in the UK
Where can someone buy the air fryer in the UK? It is typically available through major electrical retailers, the Ninja website, and larger online marketplaces. Before ordering, they should confirm the exact model code is SL400UK and that the product listing matches the dual-drawer setup with a 9.5L total capacity. They should also check that the description specifies 2 drawers and 2 racks, alongside 6 cooking functions. Delivery terms are another key check, including returns and whether the grey finish is available. Stock levels can change across listings, so confirming availability before purchase is practical.
Frequently Asked Questions
Is the air fryer worth it?
For faster, lower-oil cooking of chips, chicken, veg and reheats, this air fryer earns its place with 9.5L capacity and two drawers so you can cook two things at once. It is also cheaper to run than heating a full-size oven - check the current Amazon UK price, as it changes often.
Is the Ninja big enough for a family?
The Ninja Double Stack XL has 9.5L capacity, split across two drawers, so the usable space per drawer is smaller than the total suggests. As a rough guide, 4-5L suits 1-2 people, 6-8L suits 3-4, and larger or dual-drawer models suit families of 4 or more.
What are the downsides of the air fryer?
Air fryers take up worktop space (dual-zone models are bulky), cook smaller batches than a full oven, and some foods still need a light oil spray. They are best for crisping and reheating rather than replacing every oven job, which is why they suit some kitchens better than others.
Is this air fryer cheaper to run than an oven?
For small and medium portions, usually yes - the Ninja heats a much smaller space than a full-size oven and cooks faster, so it uses less energy. For large meals that fill a big oven anyway, the saving is smaller. Exact cost depends on its wattage and your tariff.
Can the air fryer cook two things at once?
Yes - the Ninja has two separate drawers, so you can cook two foods at different temperatures and times, and finish them together. It is ideal for a main and a side, though it takes up more worktop space than a single-drawer model.
What can you cook in the air fryer?
The Ninja Double Stack XL has 6 cooking functions covering jobs like air-fry, roast, bake, grill and reheat. Beyond chips it handles chicken, fish, veg, bacon and reheating leftovers crisply; baking and dehydrating are possible on models that offer those modes.
Is this air fryer easy to clean?
The drawer and crisper plate wipe or wash clean; non-stick coatings make this easier. Clean it after each use, as baked-on grease is harder to remove later.
Do you need oil in the Ninja?
Little or none - the air fryer circulates hot air to crisp food, so most things need only a light spray of oil or none at all. Naturally fatty foods like sausages need no added oil, while a fine mist helps fresh chips and breaded items crisp up.