I bought this oven to replace my old air fryer. This machine is for anyone who cooks big family meals.
My Ninja DT251 review shows a fast and bulky machine. It cooks great food, but it takes up your whole counter.
This section gives you my fast thoughts on this oven.
| Category | Verdict |
| Best For | Big families and daily cooking |
| Not Ideal For | Tiny kitchens with low cabinets |
| Biggest Strength | Fast cooking and huge capacity |
| Biggest Weakness | Hard to clean the wire rack |
| Overall Rating | 4.5 out of 5 stars |
Unboxing & First Impressions
Opening the box felt like unpacking a heavy tank. The metal build quality feels very solid. It weighs a lot, so I needed help moving it. I noticed a small plastic smell at first, but it faded fast.
It takes up a huge countertop footprint. The cord length is okay, but I had to move things around. The display quality looks sharp. The wide air fryer basket feels very strong.
Cooking Performance
This oven changes how you make dinner. It cooks fast and runs very hot.
Frozen fries:
I cooked frozen fries at 390°F for 16 minutes. They came out perfectly crispy and golden. I did a basket shake halfway through fries to fix some soft spots.
Chicken wings:
Wings cook so well in this machine. I used 400°F for 22 minutes. The skin got very crunchy, and the meat stayed juicy. Smoke is low, but a strong grease smell after cooking wings is normal.
Reheating pizza:
This is the best tool for leftover pizza. I set it to 350°F for 4 minutes. It makes the crust crispy again without burning the cheese. Reheating pizza late at night is my top use for it.
Vegetables:
Carrots and broccoli roast fast at 375°F. They cook evenly in just 15 minutes. I suggest using parchment liners on the drip tray to catch the mess.
Real-Life Daily Use Experience
Living with this machine is great but sometimes loud. The convenience and preheat speed are amazing. It hits 400°F in just 90 seconds. The controls are easy to read. The display brightness is perfect all day.
Basket handling takes care because you need oven mitts. I see oil collecting in basket corners on the drip tray below. It also blows hot air, with heat coming from side vents. Besides those small annoyances, the daily cooking workflow is super fast. Odor retention is mostly low.
Design & Build Quality
The materials look great but need care. It feels like a costly machine.
| Feature | Material | Feel |
| Body | Metal | Sturdy |
| Handle | Metal | Solid |
| Screen | Plastic | Modern |
I love the handle sturdiness. The machine has great stability on the counter. But, you will wipe fingerprints on glossy finish parts every single day. It has no cheap feel.
Noise Level
This air fryer makes real noise in your kitchen. The fan loudness is easy to hear. It sounds like a strong microwave fan.
The loud beeping is my main gripe. It beeps loud when you push buttons and when food is done. Vent noise keeps going even after cooking stops. It will not stop talks nearby. Still, the air fryer noise is louder than my old oven.
Cleaning & Maintenance
Cleaning this oven takes some real work. Cleaning after messy foods leaves a mark.
| Part | Dishwasher Safe | Cleaning Effort |
| Mesh Basket | Yes | Hard |
| Bake Pan | Yes | Medium |
| Crumb Tray | No | Easy |
Food sticking to the mesh basket is a real pain. I spend time scrubbing it after greasy foods. There are hard-to-clean corners inside the oven walls. Smell retention is low, but you must clean grease buildup often. Basket coating durability seems fine so far.
Pros and Cons
Here are the main good and bad points. I want to be totally honest here.
| Pros | Cons |
| Fast 90-second preheat | Takes up massive counter space |
| Huge cooking space | Hard to clean mesh basket |
| Smart cooking presets | Very loud beeps and fan |
| Even cooking results | Heat vents warm up the kitchen |
Comparison With Similar Air Fryers
Comparing this to other models helps show its true value. It holds its own against big brands and cooks faster than most.
Breville Smart Oven Air Fryer Pro
This Breville model is a direct rival. I used it to cook meals at a friend’s house.
| Feature | Ninja DT251 | Breville Pro |
| Preheat Time | 90 seconds | 3-5 minutes |
| Controls | Digital Handle | Knobs |
The Ninja wins on speed and value. Both machines offer great cooking quality and large basket size. The Breville has less noise, but the Ninja has better smart features. Both take work for ease of cleaning.
Who Should Buy This Air Fryer?
This oven fits some people perfectly. Here is a quick breakdown to help you decide.
Buy This If:
- You cook for a big family.
- You want fast cooking speeds.
- You love a crispy texture.
Avoid This If:
- You lack countertop space.
- You hate cleaning wire racks.
- You want a quiet machine.
Long-Term Durability
After heavy use, this oven holds up well. The handle stays tight without any loose handle possibility. The display durability seems very good. Performance consistency is the best part.
The only issue is looks. The metal pan gets stained fast. Plastic aging is not a problem yet. The expected lifespan seems long, but it will not look new for long. Basket coating wear is minor.
Energy Efficiency
This oven saves energy compared to a big oven. It is much faster than a standard oven. This drops my electricity usage impressions. It is highly efficient for small meals.
But, the kitchen heat output is real. It warms up my kitchen fast. Still, it is totally worth using daily instead of firing up my main stove.
Final Verdict: Ninja DT251 Review
The Ninja DT251 is a true beast. It handles busy weeknight cooking with total ease. The huge space is its best trait and biggest flaw.
I truly recommend it if you have the counter space. The fast speed makes it worth every penny. Just be ready to do some extra scrubbing.