Ninja DoubleStack XL SL401, Deep Grey vs Ninja DoubleStack XL Smart SL451, Deep Gray
These are side-by-side facts taken from each product guide: published specifications, strengths and caveats as their sources state them. This page is not a test, a ranking or a verdict about which model is better.
Ninja DoubleStack XL SL401, Deep Grey
Households that want two 5-quart zones in a tall, narrow unit with 6 inches of headroom
A 1,690-watt stacked air fryer with two independently controlled 5-quart baskets, two crisper plates and two stacked meal racks, six programs, Smart Finish and Match Cook. The owner's guide asks for 6 inches of space on the top and sides and forbids extension cords. One-year limited warranty.
Published specifications
- SharkNinja: 120 V, 1,690 W, 15 A, 32 in cord
- SharkNinja: 20.83 x 13.07 x 17.72 in, 25.13 lb
- Guide: at least 6 in space on top and sides
- Guide: Bake up to 4 h; Dehydrate 1-12 h
- Guide: baskets, plates, racks dishwasher safe
- SharkNinja: 1-year warranty
Strengths
- Two independent 5-quart zones with separate heaters and fans
- Stacked meal racks allow two levels per basket
- Baskets, plates and racks can go in the dishwasher
Caveats
- Needs 6 inches of space above and at the sides
- No extension cord or below-counter outlet allowed
- Listing size and voltage fields conflict with SharkNinja
Ninja DoubleStack XL Smart SL451, Deep Gray
Cooks who want the stacked two-basket design plus a leave-in thermometer, with 6 inches of headroom
A 1,690-watt stacked air fryer with two independent 5-quart baskets, two stacked meal racks and a Foodi Smart Thermometer. The owner's guide SharkNinja lists for it asks for 6 inches of space on the top and sides and forbids extension cords, but has no thermometer instructions. One-year warranty.
Published specifications
- SharkNinja: 120 V, 1,690 W
- SharkNinja: 20.83 x 13.07 x 17.72 in, 25.35 lb
- Guide: at least 6 in space on top and sides
- Guide: Air Broil fixed at 450°F
- Guide: baskets, plates, racks dishwasher safe
- SharkNinja: 1-year warranty
Strengths
- Includes the Foodi Smart Thermometer
- Two independent 5-quart zones with meal racks
- Baskets, plates and racks can go in the dishwasher
Caveats
- Guide listed for SL451 has no thermometer instructions
- Needs 6 inches above and at the sides
- Listing temperature and window fields conflict
Read the full Ninja DoubleStack XL Smart SL451, Deep Gray guide
How to choose between them
Choose the Ninja DoubleStack XL SL401, Deep Grey if your situation matches: Households that want two 5-quart zones in a tall, narrow unit with 6 inches of headroom. Its main caveat: Needs 6 inches of space above and at the sides.
Choose the Ninja DoubleStack XL Smart SL451, Deep Gray if your situation matches: Cooks who want the stacked two-basket design plus a leave-in thermometer, with 6 inches of headroom. Its main caveat: Guide listed for SL451 has no thermometer instructions.
Both entries repeat what each guide records. Confirm the model, included parts and availability on the current listing before ordering.
Primary sources
- SharkNinja product page for the Ninja DoubleStack XL SL401 Source for Ninja DoubleStack XL SL401, Deep Grey
- SharkNinja support: SL401 Series DoubleStack XL owner's guide (supports SL401, SL401C, SL451) Source for Ninja DoubleStack XL SL401, Deep Grey and Ninja DoubleStack XL Smart SL451, Deep Gray
- SharkNinja product page for the Ninja DoubleStack XL with Smart Thermometer, SL451 Source for Ninja DoubleStack XL Smart SL451, Deep Gray
Primary sources checked .