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Instant Omni Plus 18L vs Oster French Door Toaster Oven Side-by-Side Comparison

Alan Nguyen
Reviewer
Nguyen Ntk
Visual Specialist
Updated

Instant Omni Plus 18L Air Fryer Toaster Oven Combo

Oster French Door Toaster Oven

Tested Using Methodology v1.0
Updated Apr 3, 2023
Tested Using Methodology v1.0
Updated Apr 3, 2023
The front of a closed stainless steel Instant Omni Plus 18L 10-in-1 Countertop Convection Air Fryer Toaster Oven.
The front of a closed Oster TSSTTVFDDG XL Digital French Door Convection Toaster Oven. The control panel is positioned vertically on the right. Inside the oven are a shining light, two baking racks, and one baking pan.

Our Verdict

8.6
Overall Score
  • Performance (50%)
    8.1/10
  • Design (25%)
    9.7/10
  • Usability (25%)
    8.4/10
6.5
Overall Score
  • Performance (50%)
    6.4/10
  • Design (25%)
    6.7/10
  • Usability (25%)
    6.4/10

The outcome of the battle between the Instant Omni Plus 18L Air Fryer Toaster Oven and the Oster French Door Convection Toaster Oven demonstrates that size isn’t everything. The latter has a larger size and low scores than the former in every aspects; and it’s more expensive as well.

Both units are digital but the Instant has a more informative display and more intuitive controls, not to mention its extra functionality. It also has more accessories, namely a rotisserie kit and air fryer basket, to accommodate all cooking methods.

Performance-wise, the Omni Plus 18L has a more powerful output, convection setting, and combo heating elements to deliver the best results in every tests, whether it’s toasting bread, baking pizza, roasting whole chicken, or air frying fries.

Excellent Air Frying Capabilities

Instant Omni Plus 18L Performance

Oster French Door Toaster Oven Performance: Medium Heat Only
8.1
Performance Scores
  • Toast (40%)7.3/10
  • Pizza (25%)8.6/10
  • Whole Roasted Chicken (25%)8.4/10
  • Baked French Fries (10%)9.3/10
6.4
Performance Scores
  • Toast (40%)6.0/10
  • Pizza (25%)6.3/10
  • Whole Roasted Chicken (25%)8.1/10
  • Baked French Fries (10%)4.1/10
7.3

Toast

6.0
From left to right, 24 pieces of toast for the top and bottom of three toast levels including lighter, medium, and darker.
On the left: Level 1; In the middle: Level 2; On the right: Level 3
From left to right, 24 pieces of toast for the top and bottom of three toast levels including lighter, medium, and darker.
The top and bottom of the best four pieces of toast from the Instant Omni Plus 18L 10-in-1 Air Fryer Toaster Oven.
On the left are the top and bottom of four pieces of toast from the first batch, and on the right are from the second batch.
Taste: 8
50% * 8 = 4.0
Even Surface Color: 6
20% * 6 = 1.2
Consecutive Usability: 7
30% * 7 = 2.1
  • Function: Toast
  • Number Of Slices: 4
  • Toast Level: 2/5
  • Cooking Time: 5m 25s
  • Second Batch: 4m 1s
  • Convection: No

Using the steps of our Toast test, we determined that level 2—5 minutes 25 seconds on the timer—was the best option scoring a 7.3/10. In comparison, the level 1 and 3 had a more uneven while being lighter and darker surface color respectively.

The Toast Level 2 of the Instant Omni Plus 18L produced four pieces with an 85% even golden brown color. Since the fan couldn’t be deployed, the toast had some darker spots and lighter areas resulting in a 6/10.

The first batch of toast was nicely crispy while still soft and moist inside and we gave it an 8/10 for taste. Our head chef Tuyet Pham determined it would be excellent with omelet and eggs benedict but not so good for sandwiches or soup.

This is one of the few ovens with a smart program that automatically deducts time to reach certain temperatures when the oven’s already hot. Thus, the surface color of the toasts was quite consistent throughout multiple batches. In addition, due to its extra crispiness, the second batch was determined to be good enough for soup.

If you want the second batch to be similar to the first, remember to lower it by one level. Overall, the score for consecutive usability was 7/10.

Oster French Door Toaster Oven Toast Test
From left to right, 24 pieces of toast for three toast levels including lighter, medium, and darker. On the upper row are the top sides, and on the lower row are the bottom sides of the toast.
The best four pieces of toast from the Oster TSSTTVFDDG XL Digital French Door Convection Toaster Oven. On the left are the top sides, and on the right are the bottom sides of the toast.
On the left are four pieces of toast from the first batch, and on the right are from the second batch. On the upper row are the top sides, and on the lower row are the bottom sides.
Taste: 6
50% * 6 = 3.0
Even Surface Color: 6
20% * 6 = 1.2
Consecutive Usability: 6
30% * 6 = 1.8
  • Function: Toast
  • Number Of Slices: 4
  • Toast Level: 4/6
  • Cooking Time: 7m 25s
  • Second Batch: 5m 31s
  • Convection: No

We began our Toast test on the Oster with the default toast level 4 and got pretty good results right off the bat. For good measure, we continued to try the toast level 3, which failed to color evenly within the stipulated time.

We then tried level 5 only to end up with burnt toast and not the expected deep brown shade. Regretfully, while level 4 was the best toast level, it didn’t score high on our benchmark scale—only 6/10.

On this setting—7 minutes 25 seconds on the timer—the four pieces of bread on the upper tray were toasted to a nice golden brown color. However, the color became dark towards the edges, especially where the bread was less dense.

Additionally, a large portion of the bottom right piece of toast was significantly lighter, possibly indicating a cold spot in the cooking chamber. With such unevenness, we could only score the surface color a 6/10 despite the overall golden brown hue.

Moreover, due to the lengthy toasting time, the toast became very crispy but dry on the inside. Our head chef, Tuyet Pham, said this crispiness would be great for eggs benedict and especially soup, but maybe not omelets and sandwiches. Unfortunately, the dark edges produced a bitter taste, preventing it from getting higher than a 6/10 from our chef.

We toasted the second batch of four slices immediately after the first. We chose level 4 again whereupon the oven automatically calibrated the timer to 5 minutes 31 seconds.

Since the oven was already hot, the aforementioned cold spot became less apparent. The toast was not as crispy nor dry as the first batch, which made it more suitable for sandwiches and omelets.

However, the burnt edges were still a problem, so the oven received one final 6/10 for consecutive usability. If you want better results for the second batch, we recommend decreasing the toast level by one.

8.6

Pizza

6.3
A toaster oven baked 9-inch thick-crust meat pizza with cheese, onions, and green bell peppers on top inside a baking pan.
A toaster oven baked 9-inch thick-crust meat pizza with cheese, onions, and green bell peppers on top inside a baking pan.
The cross-section of a toaster oven baked pizza slice showing the crust. In the background is a pizza inside a baking tray.
Two hands break apart a slice of pizza with melty cheese, meat, and green bell peppers on top baked using a toaster oven.
Cooking Time: 10
20% * 10 = 2.0
Crust: 8
20% * 8 = 1.6
Toppings: 8.2
30% * 8.2 = 2.5
Taste: 8.5
30% * 8.5 = 2.5
  • Function: Bake
  • Temperature: 450°F
  • Cooking Time: 3m 50s
  • Convection: High

The Instant Omni Plus, having a very strong convection system, did not seem ideal for baking a 9-inch thick-crust meat pizza resulting in an 8.6/10.

A cooking time of only 3m 50s was extremely fast compared to the recommended 10 minutes on the label. After comparing it to other toaster ovens in our Pizza test, it was more than enough for a 10/10.

The crust, although golden brown, was a little soft with some lighter and darker areas due to the short cooking time plus strong fan. It got an 8/10.

The entire surface was a little too dry due to all the convection. In addition, while the cheese was nicely melted, caramelization wasn’t even due to the short cooking time. Thus, the final score for the toppings was 8.2/10.

Our chef gave the pizza an 8.5/10 for taste.

Oster French Door Toaster Oven Pizza Test
A toaster oven baked 9-inch thick-crust meat pizza with cheese, onions, and green bell peppers on top. The pizza is inside a grooved silver baking pan on a white background.
Two slices of toaster oven baked pizza on top of one another. It’s a 9-inch thick-crust meat pizza with cheese, onions, and green bell peppers on top. The pizza is inside a grooved silver baking pan.
On a white background, two hands break apart a slice of baked pizza using a toaster oven with cheese, meat, and green bell peppers on top.
Cooking Time: 9
20% * 9 = 1.8
Crust: 5.5
20% * 5.5 = 1.1
Toppings: 6
30% * 6 = 1.8
Taste: 5.5
30% * 5.5 = 1.6
  • Function: Turbo Convection
  • Temperature: 450°F
  • Cooking Time: 6m
  • Convection: Yes

For this pizza test, we didn’t choose the oven’s 400°F pizza preset because it didn’t match our Pizza test requirement of 450°F. Instead, we chose Turbo Convection as a suitable setting for baking pizza. Nonetheless, the results were not so favorable scoring only 6.4/10 on our testing scale.

We were, however, impressed that the oven only took 9 minutes to bake a 9-inch thick-crust meat pizza placed on the upper rack level. According to our accumulated data on average toaster oven performance, this deserved a 9/10.

Unfortunately, the oven lacks the high-intensity heating capability needed to crisp a crust effectively in such a short period of time, which the Toshiba AC25CEW-BS has. Consequently, parts of the crust bottom stuck to the grooves of the baking tray and the surface had a light golden color - so the score was only 5.5/10.

We had to stop baking because some of the meat and parts of the cheese started charring. It was a shame that the cheese didn’t completely melt before this, so we could only give the toppings a 6/10.

We were able to prevent the toppings from burning and the potential bitter taste. However, the crust and the topping weren’t good enough for the taste of the pizza to get a score higher than 5.5/10 from our chef.

8.4

Whole Roasted Chicken

8.1
A whole roasted rotisserie chicken using a toaster oven on an enamel baking pan on a white background.
A whole roasted rotisserie chicken using a toaster oven on an enamel baking pan on a white background.
A tray of whole toaster oven roasted chicken. The thermometer has two probes inside the chicken and displays 178°F and 190°F.
Seven pieces of a carved chicken including a carcass, two breasts, two wings, and two thighs on an enamel baking pan.
The close-up of a pulled-apart roasted chicken thigh. In the background is the rest of the roasted chicken on a tray.
Cooking Time: 9
20% * 9 = 1.8
Skin: 9.8
20% * 9.8 = 2.0
Doneness: 9
20% * 9 = 1.8
Taste: 7
40% * 7 = 2.8
  • Function: Roast
  • Temperature: 350°F
  • Cooking Time: 50 minutes
  • Convection: Yes

Following our Whole Roasted Chicken test, we chose a 3 lb chicken and it fit without a problem scoring an 8.4/10.

However, cleaning up was a big hassle as there wasn’t enough space below to use the drip pan. Worse still, during cooking fat splashed everywhere inside the oven causing the heating elements to smoke.

The roasting time was 50 minutes which was shorter than average and worthy of a 9/10.

The rotisserie kit and high convection together produced perfectly golden brown crispy skin deserving a 9.8/10. One thing to note is that due to the meat being considerably moist, the skin lost its crispiness in a relatively short time span.

The smooth rotation and high convection also allowed the whole chicken to be thoroughly cooked without any pink spots in just 50 minutes. The internal temperature was only a little higher than the USDA recommended 165°F-180°F at 178-190°F, so it got a 9/10.

The meat was almost fall-off-the-bone. Unfortunately, with it being so moist—to the point of softening the skin, our chef could only give it a 7 for taste.

Oster French Door Toaster Whole Roasted Chicken Test
A whole roasted chicken using a toaster oven on a white background. The chicken is belly up on a baking rack with a silver baking pan below.
A whole chicken roasted using a toaster oven on a baking rack with a silver baking pan below. The thermometer displays the same temperature of 181°F from two probes inserted into the right and left thighs of the chicken.
The roasted chicken is carved into ten pieces on a baking rack with a silver baking pan below. There are three pieces of the carcass, two wings, two thighs, two breast pieces, one drumstick, and two fallen leg bones.
Two hands pulling apart a juicy chicken thigh roasted in a toaster oven. In the white background is the rest of the roasted chicken on a baking rack with a silver baking pan below.
Cooking Time: 7
20% * 7 = 1.4
Skin: 7.5
20% * 7.5 = 1.5
Doneness: 9.8
20% * 9.8 = 2.0
Taste: 8
40% * 8 = 3.2
  • Function: Turbo Convection
  • Temperature: 350°F
  • Cooking Time: 1h 10m
  • Convection: Yes

The spacious interior of the Oster seemed a key factor in our Whole Roasted Chicken test, scoring an impressive 8.1/10. We placed a 3 lb chicken belly-up on the upper rack level and flipped it after the first 40 minutes.

After 1 hour and 10 minutes, the skin reached an acceptable roasted color scoring a 7/10 for cooking time. Our chef surmised that further roasting wouldn’t result in better skin caramelization. Thus, we stopped roasting to avoid overcooking the meat and inadvertently lowering the total score.

The skin had an appetizing golden color, except for the sides of the two drumsticks which were a little lighter in color. Compared to other benchmark tests, the skin only crisped slightly indicating the heating elements and convection system to be less than ideal/top-of-the-range. The results were good, enough for a 7.5/10.

In conclusion, the oven maintained an ideal temperature long enough to evenly cook an entire chicken throughout. We measured the internal temperature of the chicken and it was 181°F. This was very surprising and almost spot-on with the recommended 165°F - 180°F by the USDA—thus earning a whopping 9.8/10 for doneness.

Interestingly, the meat came out so tender that the bone simply fell off as we tried to carve the chicken. If the skin was crispier, the chicken would have received a higher than 8/10 for taste.

9.3

Baked French Fries

4.1
Pieces of baked french fries using a toaster oven inside an air fryer basket on a grey background.
Pieces of baked french fries using a toaster oven inside an air fryer basket on a grey background.
A close-up of pieces of baked french fries using a toaster oven inside an air fryer basket on a grey background.
Ten pieces of broken-up baked french fries are stacked on top of pieces of whole fries inside an air fryer basket.
Cooking Time: 9
20% * 9 = 1.8
Color: 9.8
20% * 9.8 = 2.0
Texture: 9.8
20% * 9.8 = 2.0
Taste: 9
40% * 9 = 3.6
  • Function: Air Fry
  • Temperature: 400°F.
  • Cooking Time: 15m
  • Convection: High

The Instant Omni Plus was excellent at baking 12 oz of french fries with a score of 9.3/10.

After performing our Baked French Fries test on different toaster ovens, we came to the conclusion that the ideal cooking time for baked french fries was 15 minutes. However, it wasn’t the fastest one on our list so it scored a 9/10.

The strong convection combined with the air fryer basket produced evenly golden fries worthy of a 9.8/10 for color.

What helped the color also baked perfectly crispy fries while retaining a nice amount of moisture. This earned the oven another 9.8/10 for the texture of baked french fries.

Our chef gave the fries a 9/10 for taste.

Oster French Door Toaster Baked French Fries Test
Pieces of baked french fries using a toaster oven inside a silver grooved baking pan on a white background.
A closeup of pieces of baked french fries using a toaster oven inside a silver grooved baking pan.
Pieces of baked french fries using a toaster oven. Eight pieces of broken-up fries are stacked on top of pieces of whole fries inside a silver grooved baking pan.
Cooking Time: 0
20% * 0 = 0.0
Color: 5
20% * 5 = 1.0
Texture: 5.5
20% * 5.5 = 1.1
Taste: 5
40% * 5 = 2.0
  • Function: Turbo Convection
  • Temperature: 400°F
  • Cooking Time: 30 m
  • Convection: Yes

For our Baked French Fries test, the Oster was disappointing, scoring only 4.1/10. Our reasoning was the poor size ratio of the cooking chamber to the oven’s power output. The oven wasn’t able to maintain a high enough temperature for baking frozen fries, as opposed to the Ninja DT201.

After 30 minutes the fries showed no significant change in color—where the test time limit was 25 minutes! Therefore, we had no choice but to stop baking and give the fries a 0/10 for cooking time.

Most fries had a pale color as if they were air-dried instead of air-fried. Some small pieces had a light golden color, but that wasn’t enough to score higher than 5/10.

Texture-wise, the fries were soft but dry on the outside, barely enough for a 5.5/10. All things considered, the only silver lining was that the fries were cooked, so our chef gave them a 5/10 for taste.

Modern Technology

Instant Pot Omni Plus Toaster Oven Design Review

Oster XL French Door Countertop Toaster Oven Design Review: Aesthetic Only
9.7
design Scores
  • Exterior (25%)9.5/10
  • Interior (30%)9.5/10
  • Build Quality (50%)9.0/10
6.7
design Scores
  • Exterior (20%)8.0/10
  • Interior (30%)7.0/10
  • Build Quality (50%)6.0/10

In the Instant Pot Omni Plus 18L Box

In the Oster TSSTTVFDDG Double-Door Convection Toaster Oven Box
An oven rack, air fryer basket, rotisserie kit, lifter, the Instant Omni Plus 18L, user manual, box, and enamel baking pan.
  • Model: 140-4002-01
  • Warranty: 1 year (US and Canada only)
  • User Manual
  • Baking Rack
  • Baking Pan
  • Rotisserie Kit and Lifter
  • Air Fryer Basket

Besides keeping all the accessories in place, the packaging also has interesting illustrations for the key information on the Instant Omni Plus 18L. You can quickly access the download page for the Instant Pot App thanks to the QR code on the package and the user manual.

Their website provides the full manual, how-to videos, FAQs, and more. You’ll also need to go there to register your product and activate your warranty.

Top to bottom and left to right are a blue box, the Oster TSSTTVFDDG Toaster Oven, one baking rack, one baking rack with supports, a user manual, and a silver grooved baking pan on a white background.
  • Model: TSSTTVFDDG
  • Warranty: 1 year (US and Canada only)
  • User Manual
  • Baking Rack x 2
  • Baking Pan
  • Removable Crumb Tray

The Oster TSSTTVFDDG arrived boxed between two styrofoam brackets. The four accessories were packaged inside carton boxes and taped to the oven. While the box only has some basic information,  a complete user manual was inside.

9.5

Exterior

8.0
A closed front of the Instant Omni Plus 18L 10-in-1 Air Fryer Toaster Oven with exterior measurements on a white background.
A closed front of the Instant Omni Plus 18L 10-in-1 Air Fryer Toaster Oven with exterior measurements on a white background.
The front of a closed Instant Omni Plus 18L 10-in-1 Toaster Oven has a control panel and the right has ventilation holes.
The back and left sides of the Instant Omni Plus 18L have air ventilation holes. The back has a power cord and two buffers.
The top of the stainless steel Instant Omni Plus 18L 10-in-1 Air Fryer Toaster Oven on a grey background.
On a grey background, the bottom of the stainless steel Instant Omni Plus 18L 10-in-1 Air Fryer Toaster Oven has two stands.
  • Weight:
    25.4 oz (721 g)
  • Length:
    16.5" (42.0 cm)
  • Width:
    15.8" (40.0 cm)
  • Height:
    13.9" (35.3 cm)
  • Material:
    Stainless steel
  • Color:
    Silver
  • Door Handle:
    cool-touch
  • Tray Indicators:
    Yes
  • Crumb Tray:
    Yes

An example of the Instant Omni Plus 18L’s clever design is the slide-out crumb tray not to mention its two strong base stands as well as air ventilation on two sides and the back. For safety, it has two buffers on the back to prevent the oven from sitting too close to the wall and a cool-touch door handle.

To accommodate its many cooking functions, there are tray-level indicators on the glass door. Our measurements of the oven’s footprint of 16.54" x 15.75" x 13.90" were quite different from the manufacturer’s 12" x 12" x 13.89" in terms of length and width.

We could explain that the difference in width was because we also took the dial and the back buffers into account but not the difference in length. Nonetheless, we didn’t find this to be a problem.

An closed front of the Oster TSSTTVFDDG XL Digital French Door Convection Toaster Oven on a white background. The exterior is 16.75 inches long, 21.53 inches wide, and 12.79 inches high.
An closed front of the Oster TSSTTVFDDG XL Digital French Door Convection Toaster Oven on a white background. The exterior is 16.75 inches long, 21.53 inches wide, and 12.79 inches high.
The front and the right sides of a closed Oster TSSTTVFDDG XL Digital French Door Convection Toaster Oven on a white background. The control panel is in the front. The right side has air ventilation holes.
On a white background, the back and the left sides of a closed stainless steel Oster TSSTTVFDDG XL Digital French Door Convection Toaster Oven both have air ventilation holes. The back side has a black buffer.
On a white background, the top and the right sides of a closed stainless steel Oster TSSTTVFDDG XL Digital French Door Convection Toaster Oven both have air ventilation holes. The control panel is in the front.
On a white background, the bottom of a closed stainless steel Oster TSSTTVFDDG XL Digital French Door Convection Toaster Oven has four base stands and ventilation holes. The control panel is in the front.
  • Weight:
    16.8 lbs (7.6 kg)
  • Length:
    21.5" (54.7 cm)
  • Width:
    20.0" (50.7 cm)
  • Height:
    12.8" (32.5 cm)
  • Material:
    Stainless steel
  • Color:
    Silver
  • Door Handle:
    Cool-touch
  • Tray Indicators:
    No
  • Crumb Tray:
    Removable

Considering the Oster’s large size, ventilation slats on all sides are a big plus. (+3). At first glance, the most stand-out feature was the tempered glass french door with cool-touch door handles (+3).

It has a rear buffer to maintain a cool distance from the wall, but we thought it could be greater(+2). Additionally, while the oven’s leg stoppers are sturdy, they are rather small.

Our measurements of the oven’s footprints were 21.53" x 19.96" x 12.79" which matched closely with the manufacturer’s 22" x 19.5" x 13". On a side note, we weighed the oven and it was 16.75 lbs while the manufacturer stated the entire package to be 13.87 lbs.

Control Panel

The black touchscreen LCD of the Instant Omni Plus 18L Air Fryer Toaster Oven has 15 features and a master-control knob.
  • Type:
    black LCD digital touchscreen + one master-control knob
  • Temperature:
    150°F - 450°F
  • Timer:
    1 - 60 minutes
  • Indicator Light:
    Yes
  • Status Bar:
    No
  • Light Toggle:
    Yes
  • Convection Toggle:
    Yes
  • Rotation Toggle:
    Yes
  • Automatic Preheat:
    Yes
  • Audio Cues:
    Yes

This oven has a black LCD digital touchscreen and one master-control knob. The display includes the cooking status bar, functions, and toggles for Light, Convection, and Rotation. Besides the automatic oven preheat feature, it features an audio cue to turn food halfway through the input cooking time.

Audio cues include the beeps when you plug in the oven, select a function as well as adjust time and temperature, and when the oven finishes cooking. According to some reviews we’ve seen, they can be a bit loud, especially for households with children and/or pets. However, they can be turned off by pressing and holding the control knobs for 5 seconds until the screen displays S OFF.

The control panel of the Oster TSSTTVFDDG Toaster Oven has an LCD and 15 flat buttons for Toast, Bake, Broil, Turbo Convection, Pizza, Warm, Defrost, Dehydrate, Timer, Temp, Clock, Stop/Cancel, and Start.
  • Type:
    LCD + 15 buttons
  • Temperature:
    150°F - 450°F
  • Timer:
    1 minute - 6 hours
  • Indicator Light:
    No
  • Status Bar:
    No
  • Light Toggle:
    No
  • Convection Toggle:
    No
  • Rotation Toggle:
    No
  • Automatic Preheat:
    Yes
  • Audio Cues:
    No

The Oster has an LCD and 15 flat buttons including 8 for functions, 2 for timer adjustment, 2 for temperature adjustment, a Clock button, a Stop/Cancel button, and a Start button. The oven has an automatic interior light with no toggle button.

Cooking Functions

Cooking Functions of the Oster XL Digital Convection Toaster Oven
  • Air fry (180°F - 450°F)
  • Broil (350°F - 450°F)
  • Bake (180°F - 450°F)
  • Roast (180°F - 450°F)
  • Dehydrate (85°F - 175°F)
  • Reheat (120°F - 360°F)
  • Warm (170°F - 300°F)
  • Toast (level 1-5)

Even though there’s no Rotisserie function, the oven comes with a tailored rotisserie kit and a Rotation Toggle. Besides making dried fruits, herbs, and meat jerky, the Dehydrate function is also ideal for proofing bread dough at 85°F and Low Convect.

The eight cooking functions of the Oster TSSTTVFDDG Toaster Oven are in the center of the control panel. They include Toast, Bake, Broil, Turbo Convection, Pizza, Warm, Defrost, and Dehydrate. The oven’s right side has air ventilation holes.
  • Toast (level 1-6)
  • Bake (150°F-450°F)
  • Turbo Convection (150°F-450°F)
  • Broil (450°F)
  • Pizza (400°F)
  • Warm (150°F)
  • Defrost (150°F)
  • Dehydrate (150°F)

The Oster has eight cooking functions including Toast, Bake, Broil, Pizza, Warm, Defrost, Dehydrate, and Turbo Convection. Despite the name, Turbo Convection is basically Convection Bake—meaning this oven only has one convection level.

The standard Bake function and ‘Turbo’ Convection operate in the oven’s maximum temperature range, between 150°F to 450°F. The Toast function has 6 preset levels from Light to Dark, Meanwhile, the Pizza function is set to 400°F and Broil to 450°F—meaning neither can be adjusted.

The user manual recommends not to preheat the oven when using Defrost and Dehydrate. These two functions are set to 150°F—the lowest possible temperature —and cannot be adjusted. However, 150°F is a bit high compared to common dehydrators which operate at around 100°F.

For some reason, we couldn’t find the set temperature for Warm in the manual, but we measured the temperature to be 150°F.

9.5

Interior

7.0
The Instant Omni Plus 18L’s cooking chamber has 2 bottom heating elements, 3 guide rails, a rotisserie socket and bracket.
The Instant Omni Plus 18L’s cooking chamber has 2 bottom heating elements, 3 guide rails, a rotisserie socket and bracket.
The 2 bottom quartz heating elements of the Instant Omni Plus 18L 10-in-1 Air Fryer Toaster Oven have guards.
The cooking chamber ceiling of the Instant Omni Plus 18L Toaster Oven has two quartz and one swirl nichrome heating element.
The cooking chamber’s right wall of the Instant Omni Plus 18L has four guide rails, a rotisserie socket, and a shining light.
  • Heating Elements:
    4 quartz and 1 nichrome
  • Convection Fan:
    Yes
  • Lighting:
    Yes
  • Tray Levels:
    4
  • Rotisserie:
    Yes
  • Safety Hook:
    No

The Instant Omni Plus has four golden quartz heating elements. These pipes use infrared light to cook, which produces more heat and also cools down faster.

They are also easier to clean and more energy-efficient but don’t last as long in terms of durability. However, if grease splashes onto the heating elements while cooking, it’ll leave permanent stains.

Featuring safety guards, the heating elements are kept out of direct contact with baking pans and trays. The oven even includes a coil nichrome heating element at the top, specifically for broiling.

To top it off, this oven has a powerful and not noisy convection system as an interior light. In addition to 4 tray levels, you can make use of the baking rack with its rack-up and down positions.

The cooking chamber of the Oster TSSTTVFDDG Toaster Oven has one nichrome heating element on top and two on the bottom, two rack levels, a shining light, and a fan cavity on the right wall.
The cooking chamber of the Oster TSSTTVFDDG Toaster Oven has one nichrome heating element on top and two on the bottom, two rack levels, a shining light, and a fan cavity on the right wall.
The cooking chamber of the Oster TSSTTVFDDG Toaster Oven has one bent nichrome heating element on top and two straight ones on the bottom, two rack levels, a light, and a fan cavity on the right wall.
Two assembled guide rails on the right side of the Oster TSSTTVFDDG XL Digital French Door Convection Toaster Oven’s cooking chamber. A fan cavity is in between the two rails.
  • Heating Elements:
    3 nichrome
  • Convection Fan:
    Yes
  • Lighting:
    Yes
  • Tray Levels:
    2
  • Rotisserie:
    No
  • Safety Hook:
    No

The Oster uses three nichrome heating elements with an unusual looped design for the upper heating element (+3). Most similar large-capacity ovens we have examined have four upper heating elements, two bottom heating elements, and a combined power draw of 1800 W.

However, the Oster has only one upper heating element which bends across and around the cooking chamber’s ceiling to cover the same area as would four. Since the power draw is divided equally between working heating elements, we speculated this design choice was to accommodate the oven’s lower power draw of 1500 W.

The TSSTTVFDDG claims to have ‘easy clean interior walls’. While they are not grease-proof, our cleaning test showed that the oven was, indeed, easy to clean (+1).

The convection fan is situated on the right side of the cooking chamber (+2). While the oven has an interior light, it’s fully automatic with no manual operation (+2).

Having only two rack levels, the oven doesn’t really require guides on the glass door (-1). The manual recommends using the upper rack position for toast and pizza, and the lower one for other foods. It’s worth noting that the rack guide rails are assembled parts and not hollowed out of the cooking chamber’s walls like many other toaster ovens.

The baking rack should not be slid into the lower rack slot with the baking tray attached to the bottom. This will result in direct contact with the bottom heating elements.

Capacity of the Instant Pot Omni Plus 18L

Capacity of the Oster Double Door Oven
An opened front of the Instant Omni Plus 18L 10-in-1 Air Fryer Toaster Oven with interior measurements on a white background.
  • Length:
    13.8" (35.0 cm)
  • Width:
    12.6" (32.0 cm)
  • Height:
    8.7" (22.0 cm)

The Instant Omni Plus can comfortably fit a 12-inch pizza or a 4-pound chicken which is true to its description. However, it can’t quite fit 6 slices of toast. Moreover, when roasting only a 3-pound whole chicken with the rotisserie kit, there wasn’t enough space to fit a baking pan below. This wasn’t the case with a larger unit like the Cosori CO130-AO.

We measured the cooking chamber’s volume to be roughly 24.6 liters—a lot different from the manufacturer’s provided capacity of 18 liters. However, this could be because we measured from the cooking chamber’s walls to walls whereas the manufacturer stopped before reaching the heating elements.

An opened front of the Oster TSSTTVFDDG XL Digital French Door Convection Toaster Oven on a white background. The cooking chamber is 15.75 inches long, 16.53 inches wide, and 10.04 inches high.
  • Length:
    15.8" (40.0 cm)
  • Width:
    16.5" (42.0 cm)
  • Height:
    10.0" (25.5 cm)

According to the manufacturer, the TSSTTVFDDG can take 14 slices of toast and two 16-inch pizzas on its two racks. However, our hands-on testing proved it fits only 12 slices (6 per rack, each requiring at least 4.5 x 4.5 inches of space)  or a 15-inch pizza. While it wasn’t clear what the maximum size for a whole chicken was, our tests indicated plenty of room for a 3 lb bird.

The manufacturer doesn’t state the interior capacity, but we measured the cooking chamber volume to be around 42.83 liters—our biggest number to date. However, we felt only two rack slots didn’t do justice to the oven’s capacity.

Power Cord

A three-pronged plug power cord. In the background is the Instant Omni Plus 18L 10-in-1 Air Fryer Toaster Oven.
  • Length:
    2.8 ft (0.9 m)
  • Type:
    3-prong plug
  • Power:
    1800 W
  • Rated Output:
    120 V ~ 60 Hz

The power cord is roughly 33.46"—more than long enough for household use. However, the cord can’t fully wrap around the two back stands as they are too high up.

A two-pronged plug power cord. In the background is the Oster TSSTTVFDDG XL Digital French Door Convection Toaster Oven.
  • Length:
    25.8" (65.5 cm)
  • Type:
    2-prong plug
  • Power:
    1500 W
  • Rated Output:
    120 V ~ 60 Hz

The power cord is 25.79" long which is enough for household use. However, it could be a bit longer since a toaster oven as large as the Oster requires at least 5 inches of clear space on all sides. The oven doesn’t have storage space for the cord like some ovens do.

Baking Rack

Accessories

Baking Rack x 2
A stainless steel baking rack of the Instant Omni Plus 18L 10-in-1 Air Fryer Toaster Oven on a grey background.
  • Length:
    12.4" (31.5 cm)
  • Width:
    11.4" (29.0 cm)
  • Height:
    0.9" (2.4 cm)
  • Material:
    Stainless steel
  • Dishwasher Safe:
    Yes

The rack fits perfectly with the guide which helps prevent accidents when placing your food in the oven.

A stainless steel baking rack with two supports below of the Oster TSSTTVFDDG XL Digital French Door Convection Toaster Oven on a white background.
A stainless steel baking rack with two supports below of the Oster TSSTTVFDDG XL Digital French Door Convection Toaster Oven on a white background.
A stainless steel baking rack of the Oster TSSTTVFDDG XL Digital French Door Convection Toaster Oven on a white background.
  • Length:
    15.7" (39.8 cm)
  • Width:
    16.1" (41.0 cm)
  • Height:
    0.7" (1.8 cm)
  • Material:
    Stainless steel
  • Dishwasher Safe:
    Yes

The Oster has two slightly different baking racks. One is the standard rack type, while the other has two supports below to slide the baking pan under.

Baking Pan

Accessories

Baking Pan
An enamel baking pan of the stainless steel Instant Omni Plus 18L 10-in-1 Air Fryer Toaster Oven on a grey background.
  • Length:
    13.8" (35.0 cm)
  • Width:
    12.4" (31.5 cm)
  • Height:
    1.8" (4.6 cm)
  • Material:
    Stainless steel
  • Dishwasher Safe:
    Yes

Thanks to its perfect size, the baking pan does a great job of catching the meat juice and drippings from the air fryer basket. Thus, it helps prevent making a mess and avoid the danger of fire from dirty heating elements. Keep in mind that the dishwasher can damage the enamel coating.

A silver baking pan of the Oster TSSTTVFDDG XL Digital French Door Convection Toaster Oven on a white background.
  • Length:
    14.13
  • Width:
    11.8" (30.0 cm)
  • Height:
    1.1" (2.9 cm)
  • Material:
    Stainless steel
  • Dishwasher Safe:
    Not advisable

The baking pan has ridges and grooves for creating attractive roast markings and catching drippings. It also has wide edges for a firm fit on the baking rack supports, unlike some other designs we’ve seen.

However, it’s not big enough to fit into the rack rail guides and can only go on top of a rack or attached beneath. This means it doesn’t make full use of the oven’s capacity. In addition, the tray is coated, but not completely non-stick so prone to stubborn stains.

Rotisserie Kit and Lifter

Accessories

Removable Crumb Tray
A rotisserie kit and lifter of the stainless steel Instant Omni Plus 18L 10-in-1 Air Fryer Toaster Oven on a grey background.
  • Length:
    13.4" (34.0 cm)
  • Width:
    11.4" (29.0 cm)
  • Height:
    0.9" (2.4 cm)
  • Material:
    Stainless steel
  • Dishwasher Safe:
    Yes

The rotisserie kit does a perfect job of securing a chicken thanks to the 4-pronged forks with adjustable angles.

The structure of the forks isn’t very strong so parts can get bended although not by much.

A stainless steel removable crumb tray of the Oster TSSTTVFDDG XL Digital French Door Convection Toaster Oven on a white background.
  • Length:
    15.7" (39.8 cm)
  • Width:
    12.5" (31.8 cm)
  • Height:
    0.8" (1.9 cm)
  • Material:
    Stainless steel
  • Dishwasher Safe:
    Not advisable

A crumb tray is always a useful accessory to clean up pesky debris, especially with a large toaster oven like the Oster. Look out for crumbs falling onto the oven floor as you take out the tray. It’s quite a hassle to tilt the oven to get them out.

Air Fryer Basket

Accessories

A stainless steel air fryer basket of the Instant Omni Plus 18L 10-in-1 Air Fryer Toaster Oven on a grey background.
  • Length:
    14.6" (37.0 cm)
  • Width:
    11.0" (27.9 cm)
  • Height:
    2.0" (5.1 cm)
  • Material:
    Stainless steel
  • Dishwasher Safe:
    Yes

The air fryer basket has a good elevation to help with heat circulation around the bottom of the food.

9.0

Build Quality

6.0
The front of an opened Instant Omni Plus 18L with a rack, a baking pan, an air fryer basket, a lifter, and a rotisserie kit.
The front of an opened Instant Omni Plus 18L with a rack, a baking pan, an air fryer basket, a lifter, and a rotisserie kit.
An oxidized slide-out crumb tray of the Instant Omni Plus 18L 10-in-1 Air Fryer Toaster Oven on a grey background.

The Instant Omni Plus 18L is a well-built and intricate piece of equipment, to say the least. It provides a helpful cooking status bar, smart programs, and automatic features. The oven does consume a lot of electricity so make sure your outlet can provide and handle 1800 W.

The meticulous design shows in the bottom tray, safeguards for heating elements, and cooling fan for its mainboard. However, the bottom tray can easily slide out if you tilt the oven. Also, during our roasting of a whole chicken, the hot drippings created some oxidation on the crumb tray.

An opened Oster TSSTTVFDDG XL Digital French Door Toaster Oven on a white background. Inside the cooking chamber, from the bottom up are one removable crumb tray, one baking rack, and one baking pan under another baking rack.

The TSSTTVFDDG is light for its size and has a graspable rectangular shape making it easy to carry or position on a counter (+2). It also has a sturdy build and durable stainless steel casing (+4). The LCD is black while the numbers are yellow and the settings are red, making everything easy to see (+1).

Unfortunately,  we found that the flat buttons often required some force to register (-1). Moreover, the door hinge could be firmer thus preventing the door from slamming shut.

Not Yet Technological Perfection

Instant Omni Plus 18L Usability

Oster TSSTTVFDDG Digital French Door Toaster Oven Usability: Could Be Improved
8.4
usability Scores
  • User Control (30%)9.9/10
  • Ease of Use (50%)8.0/10
  • Cleanability (20%)7.0/10
6.4
usability Scores
  • User Control (30%)8.0/10
  • Oster French Door Toaster Oven Ease of Use (50%)5.0/10
  • Cleanability (20%)7.5/10
9.9

User Control

8.0

The Instant Omni Plus 18L has 8 settings to choose from but can serve more than 10 functions. Although the LCD display could be improved with better contrast, it’s not a big problem.

The master-control knob can be confusing for first-timers but it should take little effort to get familiarized with it. The temperature can be adjusted in 1°F increments by turning the knob slowly and in 10°F increments by turning the knob fast. Also, the timer is specified by the minute.

If you want to readjust the setting during cooking, simply tap the feature and adjust it with the knob. Don’t tap Cancel as it will reset your inputs and repeat the automatic preheating.

The convection setting is applicable to almost all except for toast. One thing to note from the manual is that most recipes recommend reducing the temperature by 25°F when convection is on.

The convection fan speeds can toggle between high and low which is not very common for ovens, especially at the same price range. The two exceptions are Air Fry which always uses High Convect and Warm using Low Convect.

The Oster’s controls are easy to understand since what you see is what you get (+2). Therefore, the LCD doesn’t provide any extra information but it’s easy to read (+2).

The buttons have only a single function and are easy to tell apart(+2). Although the manual says you can press the Stop/Cancel button twice to turn off the oven, we weren’t able to do so (-1).

The temperature can be adjusted in increments of 5°F and the timer runs from one minute to six hours, which is quite impressive (+1). Time can be adjusted in increments of 1 minute up to  2 hours and in increments of 0.5 hours above 2 hours (+1).

To set up the clock, press the clock button once and the clock will flash. Then, use the arrow keys to set the hour and press the clock button again to likewise set the minutes. Finally, push the clock button or the start button to set the time (+1).

8.0

Ease of Use

Oster French Door Toaster Oven Ease of Use

When you adjust temperature and time for a function, the Instant Omni Plus saves your setting for next time use. After the oven finishes cooking, it will beep and automatically switch to Keep Warm mode until the display shows End.

After a period of no interaction, the digital display will show the word OFF similar to when you’ve just plugged it in. You’ll then need to push the knob once to turn it on. It’s advised to unplug the oven after you finish using it.

The light automatically turns off after 30 seconds of no interaction and turns on 30 seconds before finishing cooking. Opening the oven door pauses the cooking but the light stays on for another 30 seconds. Closing the oven door resumes the cooking but it will go into stand-by mode resetting all inputs after 5m30s.

Taking the rotisserie kit out of the oven can be a bit tricky even with the lifter. However, with a bit of practice, it’ll be no problem at all. The oven has good heat insulation, so the casing doesn’t get too hot to the touch at 350°F and 400°F but be careful at 450°F.

As you select a function, the corresponding icons will illuminate in the LCD screen. The TSSTTVFDDG has an automatic preheat phase which is only applicable for the Bake and Turbo Convection Bake functions (+1).

After setting the time and temperature, you then push start and the display will show PrE indicating the oven is in the preheating phase. You can bypass this phase by pressing the start button a second time.

Preheating takes roughly 5 minutes to around 300°F regardless of the  temperature you set. You can readjust the time and temperature only after the preheating phase.

Interestingly, we found that the oven would return to preheat mode after adjusting the temperature until the new input temperature was reached and not just 300°F. This is also stated in the user manual.

The racks fit perfectly into the rail guides thus preventing accidents when placing food in the oven (+3). When the cooking cycle begins, the interior light will turn on automatically and then off when the cooking cycle ends (+2).

The french door and its cool-touch handle allow you to stay away from the heat wave when opening after cooking (+4). The doors are also single-pull which is very convenient. However, the doors cannot open partially and can slam shut if your hand slips (-2).

Unlike some ovens, opening the door doesn’t stop the oven or the interior light (-2). The oven casing can get very hot after long cooking times at high temperatures, so you should take care (-1).

When the cooking cycle finishes, the oven will beep once, switch off the heat, and return to the clock screen. It’s advised to unplug the oven after use.

7.0

Cleanability

7.5
Grease on the slide-out crumb tray inside the cooking chamber of the Instant Omni Plus 18L 10-in-1 Air Fryer Toaster Oven.
Grease on the slide-out crumb tray inside the cooking chamber of the Instant Omni Plus 18L 10-in-1 Air Fryer Toaster Oven.
The cleaned cooking chamber floor and 2 bottom heating elements of the Instant Omni Plus 18L 10-in-1 Air Fryer Toaster Oven.
Brushing the stained upper quartz heating elements of the Instant Omni Plus 18L 10-in-1 Air Fryer Toaster Oven.

We cleaned the Instant Omni Plus 18L following our toaster oven cleaning guide. Despite having an internal and external coating, it still wasn’t easy to clean due to some very tricky nooks and crannies. The small gaps between the heating elements and internal walls didn’t help either.

Most of the mess came from the considerable fat splatter from roasting a whole chicken. It left difficult stains on the heating elements and their safeguards which were already tricky to clean.

With the removable oven-bottom tray, cleaning up the crumbs was extremely easy but we still had to tilt the oven to get all of the crumbs out. On the bright side, having thought it would be difficult to clean caramelized bits of food from the air fryer basket due to the fishnet design, we were happy to find this wasn’t the case.

A silver baking pan of the Oster TSSTTVFDDG XL Digital French Door Convection Toaster Oven with some stains on it on a white background.

The stainless steel exterior of the Oster was very easy to clean (+2). Even though the interior doesn’t have a non-stick coating, there are no tricky nooks and crannies, so cleaning didn’t require much labor (+4).

After roasting a chicken, the baking pan accumulated some stubborn stains which we were able to remove even with a baking soda paste and water (+1.5). We were worried the grease could splash inside the fan cavity while cooking, but this was not the case.