Our recommendations are made independently through Research & Testing. We may receive commissions from purchases made via our links.
Instant Omni Plus 18L vs Oster TSSTTVMNDG-SHP-2 Toaster Oven Side-by-Side Comparison
Our Verdict
- Performance (50%)8.1/10
- Design (25%)9.7/10
- Usability (25%)8.4/10
- Performance (50%)7.0/10
- Design (25%)6.2/10
- Usability (25%)6.6/10
The Oster TSSTTVMNDG-SHP-2 managed to fall not too far behind the Instant Omni Plus 18L in most of our performance tests including toasting bread, roasting a whole chicken, and baking pizza. However, the Instant left the Oster in the dust with its baked french fries.
Their differences in performance could be explained by a number of factors. The Instant’s four quartz heating elements and one swirl nichrome heating element are powered with 1800 W. Meanwhile, the Oster’s four nichrome heating elements are only supplied with 1300 W in addition to the oven’s larger capacity.
Design-wise, both ovens have a slide-out crumb tray as well as other features but the Instant’s materials are more durable. Not only the Instant has more cooking functions, but it also has more accessories to accommodate more cooking methods including a rotisserie kit and an air fryer basket.
As for features of convenience, both have toggles for lighting and convection. However, the Instant’s control panel has a useful cooking status bar alongside audio cues and automatic features. While both are easy to use, the Oster’s buttons could be improved with better responsiveness.
The Instant Omni Plus 18L is the winner in all aspects, and at a fair price. Nonetheless, the Oster TSSTTVMNDG-SHP-2 is still an inexpensive, large toaster oven that does the job.
Instant Omni Plus 18L Performance
- Toast (40%)7.3/10
- Pizza (25%)8.6/10
- Whole Roasted Chicken (25%)8.4/10
- Baked French Fries (10%)9.3/10
- Toast (40%)6.2/10
- Pizza (25%)8.0/10
- Whole Roasted Chicken (25%)7.8/10
- Baked French Fries (10%)6.0/10
Toast
- 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.
- Function: Toast
- Number Of Slices: 4
- Toast Level: 2/6
- Cooking Time: 6m 43s
- Second Batch: 4m18
- Convection: No
Using the steps of our Toast test, we determined that level 2—6 minutes 43 seconds on the timer—was the best option, scoring a 6.2/10. In comparison, the toast at level 1 had a very light color, and the toast at level 3 had a dark brown color, with some dark patches.
The Toast Level 2 of the Oster produced four pieces with a golden brown color on the top. However, due to the unideal tray position, the toast was dark brown on the bottom. Even though the color was even, the big difference between the top and bottom resulted in a 6/10.
Due to the long cooking time, the first batch of toast was crispy outside but a bit dry inside, so it got a 7/10 for taste. Our head chef, Tuyet Pham, determined they would go well with eggs benedict, omelet, and soup, in particular, but not with sandwiches.
Even though this oven automatically deducted the toast timer to 4m 18s, the second batch was still significantly darker and drier. The color was also uneven, ranging from golden brown to dark, so it got a 5/10 for consecutive usability.
Pizza
- 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.
- Function: Bake
- Temperature: 450°F
- Cooking Time: 6m 50s
- Convection: Yes
The Oster did very well in baking a 9-inch thick-crust meat pizza, but the evenness in caramelization could be improved. Thus, it received an 8/10 in total.
It only took 6m 50s to bake the pizza as opposed to 10 minutes on the label. In comparison to other toaster ovens in our Pizza test, it got a solid 8.2/10.
The crust had a nice golden brown color and since it was neither too soft nor too dry, it scored an 8/10. The cheese was melty and the toppings’ caramelization was about 80% even, so we gave it another 8/10. For its taste, our chef gave the pizza one final 8/10.
Whole Roasted Chicken
- 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.
- Function: Bake
- Temperature: 350°F.
- Cooking Time: 1h
- Convection: Yes
Thanks to the Oster’s large capacity, we placed a 3 lb chicken on top of its broiling rack which is then set on top of the baking pan before we perform our Whole Roasted Chicken test. The overall score was 7.8/10.
The oven was able to roast the chicken in 1 hour, which was the standard amount of time needed, and deserved an 8/10. Thanks to the broiling rack and the oven’s convection system, the skin got an even golden color throughout. However, even with those advantages, the skin wasn’t able to crisp up much, so it got a 7/10.
The chicken was fully cooked, but its internal temperature was a tad high at 190-192°F, so we gave it an 8.8/10. The meat was soft and juicy throughout, so it earned a 7.5/10 for taste from our chef.
Baked French Fries
- 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.
- Function: Bake
- Temperature: 400°F
- Cooking Time: 20 m
- Convection: Yes
The Oster left a lot to be desired in baking french fries, thus scoring a 6/10.
The oven took 20 minutes to bake 12 oz of french fries. In comparison to other toaster ovens in our Baked French Fries test, it scored a 7.3/10.
The fries had an uneven color, ranging from almost none to golden and brown on the ends, so they got a 6.8/10. The fries were very soft so they could only get a 6/10 for texture. Our chef gave the fries a 5/10 for taste.
Instant Pot Omni Plus Toaster Oven Design Review
- Exterior (25%)9.5/10
- Interior (30%)9.5/10
- Build Quality (50%)9.0/10
- Exterior (20%)7.0/10
- Interior (30%)6.0/10
- Build Quality (50%)6.0/10
In the Instant Pot Omni Plus 18L Box
- 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.
- Model: TSSTTVMNDG-SHP-2
- Warranty: 1-year limited (US and Canada only)
- User Manual
- Baking Rack
- Baking Pan
- Rack Clamp
- Removable Crumb Tray
- Rotisserie Kit and Lifter
- Air Fryer Basket
The packaging includes two foam pads to keep the oven firmly in place and the three accessories are wrapped in carton sheets to avoid scratches during transportation. The oven also comes with a user manual.
Exterior
- 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.
- Weight:12.1 lbs (5.5 kg)
- Length:19.7" (50.0 cm)
- Width:15.2" (38.6 cm)
- Height:11.6" (29.5 cm)
- Material:Stainless steel
- Color:Black
- Door Handle:cool-touch
- Tray Indicators:No
- Crumb Tray:Slide-out
The Oster has air ventilation holes on all sides of the convection system, which is a plus. In addition, having a slide-out tray is always helpful because it makes it easier to clean the oven.
Although the back buffers aren’t very sturdy, the bottom stands are and they also act as oven-carrying handles. Our measurements of the oven’s footprints were 19. 68" x 15.19" x 11.61" which were only slightly different in terms of width to the manufacturer’s provided 19.72" x 16.29" x 11.33".
Control Panel
- 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.
- Type:LCD display + 15 buttons
- Temperature:150°F - 450°F
- Timer:1 minute - 90 minutes
- Indicator Light:Yes
- Status Bar:No
- Light Toggle:Yes
- Convection Toggle:No
- Rotation Toggle:No
- Automatic Preheat:No
- Audio Cues:No
The Oster has an LCD digital display and 15 buttons, including 8 functions, 2 to adjust time, 2 to adjust temperature, a light toggle, a clock feature, a stop and a start button. The built-in clock is something you rarely see in a toaster oven, but we’ve seen some comments about it, usually pointing out that the clock is ahead of time by 5 minutes.
Cooking Functions
- 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.
- Toast
- Bake
- Convection Bake
- Broil
- Warm
- Defrost (150°F)
- Pizza (400°F)
You can only adjust the temperature on the Bake and Convection Bake functions, which should be good enough for experienced cooks. Other functions have their temperature predetermined by the manufacturer, which can be useful for beginners in the kitchen.
For some reason, the user manual doesn’t specify the predetermined temperature for the Warm function. Nonetheless, we were able to measure it to be around 180°F, which was unfortunately quite high for its purpose. Other toaster ovens with the Warm function usually maintain around 80°F-100°F.
Interior
- 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.
- Heating Elements:4 nichrome
- Convection Fan:Yes
- Lighting:Yes
- Tray Levels:2
- Rotisserie:No
- Safety Hook:No
The Oster has four standard nichrome heating elements but only two tray levels—unlike the similar-sized Cosori CO130-AO that has three. In addition to a convection system, it has internal lighting which is always useful, especially when you can choose when to turn it on and off.
Capacity of the Instant Pot Omni Plus 18L
- 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.
- Length:14.2" (36.1 cm)
- Width:12.6" (32.0 cm)
- Height:9.4" (24.0 cm)
Its spacious interior can accommodate 6 slices of toast, a 12-inch pizza, and more than a 3 lb chicken. While the manufacturer didn’t state the exact capacity, we measured the cooking chamber’s volume to be around 28 liters.
Power Cord
- 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.
- Length:26.0" (66.0 cm)
- Type:2-prong plug
- Power:1300 W
- Rated Output:120 V ~ 60 Hz
Since the power cord is positioned at the bottom of the oven, it may have some inconvenient bends. The length of roughly 25.98" is adequate for household use but not enough to wrap around the back buffers.
Accessories
- 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.
- Length:14.2" (36.1 cm)
- Width:15.0" (38.1 cm)
- Height:0.2" (0.5 cm)
- Material:Stainless steel
- Dishwasher Safe:Yes
The rack fits perfectly with the guide rails and helps reduce the chance of an accident when you put food in the oven.
Accessories
- 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.
- Length:12.9" (32.7 cm)
- Width:10.5" (26.7 cm)
- Height:1.2" (3.0 cm)
- Material:Stainless steel with enamel coating
- Dishwasher Safe:Not advisable
The baking pan goes hand-in-hand with the broiling rack to catch the drippings and meat juice. Its enamel coating makes it more resistant to stains and caramelized bits but it is not advisable to put the baking pan in the dishwasher.
However, it’s slightly smaller than the oven’s capacity and therefore, does not make the most of the space. Nonetheless, it still does the job of preventing any hot mess from dirtying the heating elements which can lead to fire danger.
Accessories
- 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.
- Length:10.9" (27.7 cm)
- Width:8.5" (21.7 cm)
- Height:1.2" (3.1 cm)
- Material:Stainless steel
- Dishwasher Safe:Not advisable
The broiling rack has an elevation from the baking pan to allow for heat circulation around the food. However, it’s not firmly attached to the baking pan, so be careful when you move this combo around. In addition, the rack doesn’t have a coating, which may make it prone to caramelized bits, stains, and discoloration.
Accessories
- 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.
Build Quality
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.
Though it is made from durable materials and has a sturdy build, the Oster isn’t heavy for its size. The digital display is clear, but the flat buttons can be irresponsive at times; this seems to be a common problem for Oster units, as the Oster TSSTTVFDDG also suffers from it.
Throughout the testing procedure, we found that the oven’s power output of 1300 W may have offset its large capacity. Our speculation was that its performance efficiency could increase with 1800 W.
Instant Omni Plus 18L Usability
- User Control (30%)9.9/10
- Ease of Use (50%)8.0/10
- Cleanability (20%)7.0/10
- User Control (30%)6.0/10
- Ease of Use (50%)6.0/10
- Cleanability (20%)9.0/10
User Control
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.
For the Oster, the temperature can be adjusted in increments of 10°F. The timer can be adjusted in increments of 30 seconds when it’s below 10 minutes and in increments of 1 minute after 10 minutes. The convection fan isn’t all-applicable, but you can adjust time and temperature according to your preference on Convection Bake.
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.
The Oster doesn’t beep with each press of a button which isn’t normally an issue. However, because the buttons weren’t always responsive, we had to check the display with each press and this required us to do so more than once.
One thing to keep in mind is that the oven requires you to press Cancel before changing the cooking function. After the cooking cycle finishes, the digital display will show END and the oven will sound 4 beeps 3 times. You’ll then need to press Cancel before performing further inputs.
The oven’s exterior only gets hot to the touch after a long period of cooking at a high temperature (> 400°F). The door can easily be kept partially open, but it doesn’t stop the cooking process, unlike some other ovens.
The built-in clock will keep ticking as long as the oven’s plugged in, but the power consumption should be minimal. Thus, it’s up to you to keep the oven plugged in or to remove it.
Cleanability
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.
The Oster has an internal and external coating. There are no tricky nooks and crannies. The slide-out crumb tray made cleaning up the crumbs very easy but we still had to tilt the oven to remove all of them.
Although some grease splashed inside the oven during our Whole Roasted Chicken test, we could easily clean it up using the instructions in our toaster oven cleaning guide. The baking pan, even with the enamel coating, sustained some stubborn burnt bits and stains that required brushing with a paste of baking soda and water.