Quick Summary
The Ninja Double Stack XL SL400UKCP is a space saving 9.5L dual drawer air fryer for faster family meals with 4 cooking levels and 6 functions.
What This Product Is Used For
The Ninja Double Stack XL SL400UKCP air fryer is used for cooking larger family meals with two drawers, two racks and 4 cooking levels. Compared with a standard side by side dual drawer air fryer, its vertical design saves counter space while still offering a 9.5L capacity that feeds 8 people. It can Max Crisp, Air Fry, Roast, Bake, Reheat and Dehydrate, giving useful flexibility for everyday meals. Users choose it over simpler options because it combines a slimmer worktop footprint, dual drawer cooking, Sync and Match functions, dishwasher safe parts and included silicone tongs.
Who This Product Is Best Suited To
This air fryer is best suited to users who cook family portions but do not want a wide air fryer taking over the kitchen counter. It suits people who want to cook more food at once, use separate drawers, prepare meals across multiple levels and make use of guided functions for quicker everyday cooking.
Key Benefits at a Glance
• 9.5L capacity helps make family meals easy
• Feeds 8 people for practical larger portion cooking
• Vertical design is 30 percent slimmer than AF400
• 4 cooking levels let you cook more food at once
• 2 drawers and 2 racks support flexible meal preparation
• Rear fans help food cook and crisp evenly on all levels
• 6 cooking functions give simple everyday versatility
• Sync and Match functions make dual drawer timing more reliable
• Dishwasher safe parts make clean up quick
• Included silicone tongs add useful serving convenience
Pros and Cons
Pros
• Space saving vertical design gives large capacity without a wide layout
• 4 cooking levels help reduce batch cooking
• Sync and Match functions make family meals easier to manage
• Dishwasher safe parts reduce cleaning effort after cooking
Cons
• 10.3kg weight may make frequent moving less convenient
• 47cm depth needs suitable counter space
Real World Performance and Day to Day Use
In everyday use, the Ninja Double Stack XL SL400UKCP is designed for households that need family capacity but want to save worktop width. The 9.5L capacity is split across 2 x 4.75L drawers, and the included 2 racks create 4 cooking levels, allowing more food to be cooked at the same time. Rear fans help food cook and crisp evenly across those levels, which helps reduce the worry that stacked cooking will produce uneven results.
The appliance can cook up to 55 percent faster than fan ovens, based on testing against fish fingers and sausages. It can also cook using up to 55 percent less energy than an oven, based on recommended cook time for sausages using the Air Fry function versus conventional ovens. The 6 functions cover Max Crisp, Air Fry, Roast, Bake, Reheat and Dehydrate, while the Air Fry function is described as using up to 75 percent less fat compared with deep fried hand cut French fries.
Choose this if you want a large dual drawer air fryer with 4 cooking levels, space saving design and family meal capacity.
Skip this if you need a lighter compact air fryer for small portions or very shallow counters.
Why We Like This Product
The YPC Team likes this because it solves the common problem of needing large dual drawer capacity without choosing an overly wide appliance. It helps avoid the buyer mistake of picking a smaller air fryer and then needing several batches for one family meal. It also helps reduce regret by including 4 cooking levels, Sync and Match functions, dishwasher safe parts and silicone tongs.
Comparisons With Similar Systems
Compared with Ninja Double Stack air fryer
Better when
You want the SL400UKCP Black and Copper version with 9.5L capacity and silicone tongs
Alternative better when
You need a smaller Ninja model for compact portions
Compared with dual drawer air fryer
Better when
You want a vertical space saving design with 4 cooking levels
Alternative better when
You prefer a wider side by side layout with lower height
Compared with fan oven
Better when
You want faster everyday meals, lower energy use and easy dual drawer control
Alternative better when
You need to cook several large trays at once
Alternatives Worth Considering
Side by side dual drawer air fryer
Single drawer air fryer
Compact air fryer
Air fryer oven
Large capacity air fryer
Fan oven
Tips for Getting the Best Performance
Use both drawers when cooking mains and sides together.
Use the racks when you want to cook across 4 levels.
Use Sync when two foods need different settings but should finish together.
Use Match when both drawers need the same time and temperature.
Avoid overcrowding each level so the rear fans can circulate heat properly.
Use Max Crisp when the food and cooking task suit a crispier finish.
Check the height, width and depth before deciding where it will sit on your counter.
Full Technical Specification
Brand
Ninja
Model
SL400UKCP
Product Type
Vertical dual drawer air fryer
Capacity
9.5L
Portion Capacity
Feeds 8 people
Drawer Capacity
2 x 4.75L drawers
Cooking Levels
4
Drawers
2
Racks
2
Cooking Functions
6
Functions
Max Crisp, Air Fry, Roast, Bake, Reheat and Dehydrate
Sync Function
Included
Match Function
Included
Fan System
Rear fans
Speed Claim
Cooks up to 55 percent faster than fan ovens
Speed Claim Test Basis
Tested against fish fingers and sausages
Energy Claim
Cooks using up to 55 percent less energy than an oven
Energy Claim Test Basis
Recommended cook time for sausages using Air Fry function versus conventional ovens
Fat Reduction Claim
Up to 75 percent less fat using Air Fry function
Fat Reduction Test Basis
Tested against deep fried hand cut French fries
Design
Vertical space saving design
Slimness Claim
30 percent slimmer than AF400
Colour
Black and Copper
Plug
UK plug
Cleaning
Dishwasher safe parts
Dimensions
H 38.5cm x W 28cm x D 47cm
Weight
10.3kg
Guarantee
2 year guarantee upon registration with Ninja in the UK and ROI only
Box Contents
Ninja Double Stack 9.5L Air Fryer
2 x 4.75L Drawers
2 x Non Stick Crisper Plates
2 x Racks
Silicone Tongs
Buyer’s Guide
Buy this if you want easier family cooking with stronger capacity and simpler vertical space saving control
Do not buy this if you need a lighter compact air fryer for faster small portion cooking
Frequently Asked Questions
What is the Ninja Double Stack XL SL400UKCP best used for?
The Ninja Double Stack XL SL400UKCP is best used for family meals, dual drawer cooking, 4 level cooking, air frying, roasting, baking, reheating and dehydrating.
How much capacity does this Ninja air fryer have?
This Ninja air fryer has a 9.5L capacity, split across 2 x 4.75L drawers.
How many people can the Ninja Double Stack XL feed?
The Ninja Double Stack XL is described as feeding 8 people.
What cooking functions does this air fryer include?
The air fryer includes Max Crisp, Air Fry, Roast, Bake, Reheat and Dehydrate.
Does this model have Sync and Match functions?
The Ninja Double Stack XL SL400UKCP includes Sync and Match functions across the 2 drawers.
How does the 4 level cooking work?
The air fryer includes 2 drawers and 2 meal racks, giving 4 cooking levels so more food can be cooked at once.
Is this air fryer space saving?
The vertical design is described as 30 percent slimmer than the AF400, helping save counter width.
Are the parts dishwasher safe?
The Ninja Double Stack XL includes dishwasher safe parts for easier clean up.
What accessories are included?
The appliance includes 2 x 4.75L drawers, 2 non stick crisper plates, 2 racks and silicone tongs.
What are the dimensions of this air fryer?
The air fryer measures H 38.5cm x W 28cm x D 47cm and weighs 10.3kg.
