Ninja Double Stack XL Air Fryer SL400UK Review

Gigareview Score

Overall score: 9.4/10

Rating: Excellent

Overview

Customers find the air fryer performs well, cooking food evenly and virtually anything, while taking up minimal counter space with its stacked design. Moreover, the appliance is easy to use, with one customer noting it's simple to set both drawers independently, and customers appreciate its compact size and good value for money. Additionally, the air fryer is simple to clean, with one mentioning it can be popped into the dishwasher, and customers are satisfied with its performance.

Key Features

• NINJA IS THE #1 AIRFRYER BRAND IN THE WORLD : Source : Euromonitor International Ltd, Consumer Appliances 2026 Edition, retail volume sales in units, as per Air Fryers category definition, data for 2025.
• AMAZON EXCLUSIVE: Black and Copper Air Fryer with Silicone Tongs. Save space on your kitchen counter: 30% slimmer (vs AF400). Extra-large 9.5L capacity feeds 8 people. Cook up to 55% faster than fan ovens (tested against fish fingers and sausages)
• COOK ON 4 LEVELS AT THE SAME TIME: Includes 2 x drawers AND 2x meal racks giving you 4 levels, so you can cook double the food. Rear fans ensure food is evenly cooked and crisped on all levels.
• ENERGY EFFICIENT: Cook using up to 55% less energy than an oven* (*testing and calculations based on recommended cook time for sausages, using air fry function versus conventional ovens).
• 6 COOKING FUNCTIONS: Max Crisp, Air Fry, Roast, Bake, Reheat, Dehydrate. Up to 75% less fat* using the Air Fry function (*Tested against deep fried, hand-cut French fries). SYNC & MATCH functions across 2 drawers.
• INCLUDES: Ninja Double Stack 9.5L Air Fryer (UK Plug), 2x 4.75L Drawers, 2x Non-Stick Crisper Plates, 2x Racks, Silicone Tongs. Dishwasher Safe Parts. Dimensions: H38.5cm x W28cm x D47cm. Weight: 10.3kg. Colour: Black/Copper
• 2-YEAR GUARANTEE upon registration with Ninja (UK & ROI only)

Specifications

Pros

• Excellent cooking performance
• Small Footprint
• Easy to clean
• 2 Drawers

Cons

• 2 smaller rather than one large drawer
• Premium price

Our Verdict

The Ninja Double Stack XL Air Fryer SL400UK is a Air Fryers from Ninja that earns a Gigareview score of 9.4/10. In our view, it is an excellent choice for most buyers, especially for Smaller worktops. Rather than judging it only by the long Amazon product title, we focus on the areas that matter most to buyers: features, everyday usability, value for money and the compromises you should know about before purchasing.

Customers find the air fryer performs well, cooking food evenly and virtually anything, while taking up minimal counter space with its stacked design. Moreover, the appliance is easy to use, with one customer noting it's simple to set both drawers independently, and customers appreciate its compact size and good value for money. Additionally, the air fryer is simple to clean, with one mentioning it can be popped into the dishwasher, and customers are satisfied with its performance.

Its main strengths include Excellent cooking performance, Small Footprint, Easy to clean, and 2 Drawers. These are the areas where the product is most likely to stand out against competing models and where buyers are most likely to notice the benefit during regular use.

There are also some drawbacks to consider, including 2 smaller rather than one large drawer and Premium price. These are not necessarily deal breakers, but they are important to weigh up depending on your space, budget and how you plan to use the product.

Overall, the Ninja Double Stack XL Air Fryer SL400UK is best viewed as a Excellent option in its category. If it is available at a competitive price on Amazon UK, it represents a sensible choice for shoppers who want a product that matches their needs without overcomplicating the buying decision.

Product Images

Buying Advice

Before buying the Ninja Double Stack XL Air Fryer SL400UK, compare the latest Amazon UK price and check whether the current deal matches your budget. Prices and availability can change, so it is worth checking before making a final decision.