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Ninja Double Stack XL SL400UK

Where to buy

Amazon →

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Price~$250–$270 · Reviews referenced1,536 · Updated2026-04-17

One-line verdict

Ideal for families needing large capacity in small kitchens, but trades off even cooking and speed for its ultra-compact stacked design compared to side-by-side dual-zone models.

How it compares

  • vs Ninja Double Stack XL SL401 ($250–$300): SL400UK wins on price, SL401 wins on smart thermometer probe and broader smart cooking features; both share the same stacked dual-zone format
  • vs Ninja DZ201 8 Qt ($180–$220): Double Stack wins on total capacity and footprint efficiency (stacked vs side-by-side), DZ201 wins on price and wider basket access for easier loading
  • vs Ninja Foodi DZ550 ($200–$250): Double Stack wins on counter space efficiency via stacked design, DZ550 wins on price, smart probe, and side-by-side basket accessibility
  • vs Ninja Foodi DualZone XL DZ401 ($180–$200): Double Stack wins on total cooking capacity and small-kitchen space efficiency, DZ401 wins on price and easier simultaneous basket access
  • vs Ninja Foodi DZ071 ($150–$200): Double Stack wins on total capacity and simultaneous full-load cooking, DZ071 wins on price and FlexBasket MegaZone versatility

AI-summarized review themes

Frequently Praised

  • Stacked design saves counter space while cooking enough food for four to eight people
  • Sync feature cooks different foods at different temperatures, finishing simultaneously every time
  • Dishwasher-safe drawers and racks make cleanup easier than a traditional oven

Frequently Criticized

  • Uneven cooking due to rear-mounted heat, requires frequent shaking and flipping
  • Significantly longer cook times than side-by-side models, sometimes double for basic foods
  • Perforated baskets allow drips and are difficult to clean thoroughly

Best for

families of 4+ in small kitchens, cooking multiple dishes simultaneously, replacing oven for everyday meals

Not for

buyers prioritizing fast even crisping without babysitting food, small households wanting quick single-basket cooking, minimal cleanup fuss

Specifications

| Spec | Value | | Cooking Capacity | 9.5L (2x 4.75L drawers) | | Countertop Footprint | H38.5 x W28 x D47 cm | | Cooking Functions | 6 (Air Fry, Max Crisp, Roast, Bake, Deheat, Reheat) | | Wattage | 2470W | | Dual-Zone Cooking | Yes, with independent controls and SYNC | | Dishwasher Safe Parts | Drawers, racks, crisper plates | | Weight | 10.3kg |

Data sources

  • Estimated ~1536 purchase reviews via Argos
  • 1207 reviews via Currys
  • Multiple verified purchase reviews via Amazon UK
  • Review period: 2024-2026
  • Sentiment confidence: high

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