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Ninja Prestige Smart XL DT551 specifications and in-depth review

Ninja Prestige Smart XL DT551

Manufacturer: Ninja

The Ninja Prestige Smart XL DT551 is an oven-style air fryer designed for larger cooking tasks, offering a 21-liter capacity alongside a broad range of eight preset functions including air fry, roast, broil, toast, bake, keep warm, dehydrate, and reheat. It features digital controls, a viewing window, an interior light, and a preheat function, making it a functionally well-equipped unit for countertop cooking. The appliance does not support smartphone connectivity, Alexa, or Google Assistant integration.

On the technical side, the DT551 runs on 1800W of operating power and covers a cooking temperature range from 29°C up to 232°C, supported by dual heating elements for more even heat distribution. It measures 434 mm wide, 353 mm deep, and 325 mm tall, with a total weight of approximately 15.3 kg. The unit comes with a one-year warranty, and its basket or pot is not rated as dishwasher safe, requiring manual cleaning.

Pros
  • The 21-liter oven-style capacity accommodates larger quantities of food, making it suited for batch cooking or feeding multiple people
  • Ten cooking functions including air fry, roast, broil, toast, bake, keep warm, dehydrate, and reheat offer considerable versatility in a single appliance
  • Dual heating elements support more even heat distribution across the cooking chamber
  • A viewing window and interior light allow users to monitor food during cooking without opening the door
  • The preheat function and a minimum temperature as low as 29°C give precise control over the cooking process across a wide temperature range up to 232°C
Cons
  • At approximately 15.3 kg and with dimensions of 434 x 353 x 325 mm, the unit is heavy and takes up a considerable amount of countertop space
  • The basket or pot is not dishwasher safe, requiring manual cleaning after every use
  • There are no shake reminders, which means users must track cooking times manually for foods that need turning or shaking
  • No smartphone connectivity, Alexa, or Google Assistant support means the appliance cannot be monitored or controlled remotely
  • The warranty period is limited to one year
Who is this for?

The Ninja Prestige Smart XL DT551 is well suited to households that regularly cook for multiple people, given its 21-liter oven-style capacity and wide range of ten cooking functions that cover everything from air frying and roasting to dehydrating and toasting. Users who appreciate hands-on control over their cooking will benefit from the wide temperature range of 29°C to 232°C and the preheat function, which together allow for more deliberate and varied cooking outcomes. The viewing window and interior light also make it a practical choice for those who prefer to monitor their food during the cooking process without interrupting it.

Who is this NOT for?

This appliance is not well suited to users with limited kitchen counter space, as its dimensions of 434 x 353 x 325 mm and weight of approximately 15.3 kg demand a dedicated, permanent position on a sturdy surface. Those who rely on smart home integration for convenience — including remote control via smartphone, Alexa, or Google Assistant — will find the lack of any connectivity options a significant limitation. Additionally, users who prefer easy cleanup routines may find the absence of a dishwasher-safe basket inconvenient, particularly when cooking greasy or heavily seasoned foods that require thorough washing.

General info:

style Oven
capacity 21 l
is a dual-basket air fryer ✕
preset functions Air fry, Roast, Broil, Toast, Bake, Keep warm, Dehydrate, Reheat
number of functions 10
maximum cooking temperature 232°C
minimum cooking temperature 29°C
operating power consumption 1800W
warranty period 1 years

The Ninja Prestige Smart XL DT551 is an oven-style air fryer with a 21-liter capacity and a total of 10 functions, including eight presets: air fry, roast, broil, toast, bake, keep warm, dehydrate, and reheat. It is not a dual-basket model, and it operates at 1800W across a cooking temperature range spanning from 29°C up to 232°C. The unit comes with a one-year warranty.

Features:

has dual heating elements ✓
has digital controls ✓
shake reminders None
has a window ✓
has a preheat function ✓
has an interior light ✓
supports a remote smartphone ✕
works with Alexa ✕
compatible with Google Assistant ✕

The Ninja Prestige Smart XL DT551 includes dual heating elements, digital controls, a viewing window, an interior light, and a preheat function, covering the core usability features expected from an oven-style air fryer. There are no shake reminders, and the unit does not support smartphone remote control, Alexa, or Google Assistant, meaning it operates entirely as a standalone appliance without any smart home or app connectivity.

Design:

has a dishwasher-safe basket/pot ✕
width 434 mm
thickness 353 mm
height 325 mm
weight 15331.42 g
volume 49790.65 cm³

The Ninja Prestige Smart XL DT551 measures 434 mm wide, 353 mm deep, and 325 mm tall, with a total volume of 49,790.65 cm³, making it a sizeable countertop appliance that requires adequate space. It weighs approximately 15.3 kg, so while it is not intended to be moved frequently, it sits firmly on a surface during use. The basket or pot is not dishwasher safe, meaning cleaning must be done by hand.

Final Verdict

The Ninja Prestige Smart XL DT551 is a capable oven-style air fryer built around a clear strength: its 21-liter capacity paired with ten cooking functions spanning a temperature range from 29°C to 232°C, making it a versatile countertop unit for households that cook in larger volumes or need multiple cooking methods from a single appliance. Practical touches like dual heating elements, a viewing window, an interior light, and a preheat function reinforce its usability in day-to-day kitchen routines. It does come with trade-offs — the considerable size and weight mean it is firmly a fixed countertop presence, and the absence of smart connectivity or dishwasher-safe components will matter to some users. For those whose priorities align with cooking capacity and functional range rather than connectivity or compact footprint, the DT551 presents a well-rounded and straightforward option.