Last updated 24 September 2026

Air Fryers

Ninja Double Stack XL Air Fryer SL400UKCP

by Ninja

Ninja Double Stack XL Air Fryer SL400UKCP

Why we recommend it

It is the best solution for families who need large-capacity cooking but lack the counter space for traditional wide-format air fryers.

This model turns the traditional side-by-side design on its head, providing a tall footprint that fits easily in narrower spaces. It is a brilliant solution for those who want dual-zone cooking without sacrificing their entire kitchen counter.

Key features

  • 9.5L total capacity with 2 vertical drawers
  • Space-saving design (30% slimmer than side-by-side models)
  • 6 cooking functions: Air Fry, Max Crisp, Roast, Bake, Reheat, Dehydrate
  • Includes 2 stacked meal racks for 4-layer cooking
  • Sync and Match functions for simultaneous cooking

Pros

  • Excellent space-saving vertical footprint
  • High-quality build with versatile cooking options
  • Sync feature ensures different foods finish at the same time
  • Dishwasher-safe parts for easy cleaning

Cons

  • Tall design may not fit under all low-hanging kitchen cabinets
  • Premium price point compared to standard dual-drawer models

Best for

Families with limited kitchen worktop space

The Amzing verdict

"The Ninja Double Stack XL is a game-changer for smaller kitchens, offering the capacity of a large dual-zone air fryer without the massive worktop footprint. It is a highly efficient, well-engineered appliance that delivers consistent results across all four cooking levels."

Worth considering instead

AI matched

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