While we didn't find any major issues with the Koios VS2233, it didn't do quite well enough to win an award. While this kitchen appliance does do quite a good job at sealing delicate food items without smashing them and has a slightly stronger than average suction performance, it only did a mediocre job in our sealing performance tests and there are some other models that are far easier to use. Overall, this make is hard to recommend the Koios, as it costs about the same as some of our award winners, but can't come close to matching their performance.
KOIOS VS2233 Review
Pros: Good with delicate foods, fairly good value
Cons: Not the most convenient, average sealing performance
Compare to Similar Products
Our Analysis and Test Results
The Koios finished a ways behind the NutriChef PKVS18BK and the just barely ahead of the FoodSaver FM5200. The NutriChef did a bit better than the Koios when it comes to ease of use, convenience, and delicate foods, but scores about the same in terms of suction strength. Both of these kitchen appliances cost about the same as well — $65 for the Koios, $60 for the NutriChef. The Koios did quite a bit better than the FoodSaver FM5200 at sealing delicate item and pulls a slightly stronger vacuum, but it doesn't seal as well and isn't as convenient to use. However, it does retail for almost a $100 less than the FM5200 making it a much better value option.
To pick out which vacuum sealer is really the best of them all, we did tons and tons of analysis on all the most popular and highly regarded models, then bought the ones that showed the most promise to compare head-to-head. We divided up our testing process into four weighted metrics, with the Koios' results outlined below.
The Koios got off to an average start in this metric, receiving a 5 out of 10 for its results. We compared how quickly each product can seal different types of food, the number of bags it can seal in a row, the thickness of the heat sealed area, and if there is an increase in pressure when sealing manually to determine the scores for each product. Altogether, these tests account for 40% of the overall score for the Koios and the other products in the review.
This vacuum sealer got off to a bit of a slow start in our speed test, being one of the slowest vacuum sealers to seal. We tasked each product to seal four slices of bread, a pound of ground beef, four pre-cooked sausages, and one cup of dried rice. The Koios was the slowest in each of these tests, taking 9-11 seconds longer than the average time.
However, the Koios did do fairly well in our next evaluation. This model was able to seal 14 bags in a row before there was a clearly noticeable loss in suction, but we wouldn't necessarily do this in normal practice if we were sealing food for sous vide or long-term storage. The heat-sealed section is slightly thinner than average, only measuring about 2 mm across, compared to the average 2.5 mm.
Finally, the Koios did decently well in our manual sealing test. While it didn't completely maintain pressure when you manually initiated a seal, the vacuum only lost about one inch of mercury before the heat seal completed.
Following our sealing performance set of tests, our round of convenience assessments came next in terms of importance, comprising 30% of the Koios's total score. We awarded points if these appliances had a convenient place to store a roll of bags and an easy way to cut them, if there is a tray that you can take out to make cleanup easier, and the overall form factor of each vacuum sealer, as well as the interface and if there are any included accessories. The Koios delivered a middle-of-the-road performance, meriting a 5 out of 10.
This product got off to a bit of a rocky start, lacking both a cleaning tray or a place to store a roll of bags. It also does not have any sort of integrated bag cutter.
However, the Koios did earn a few extra points by taking up an average amount of counter space and being lighter than average. We also liked that the lid locks down so you don't have to hold it while sealing. Unfortunately, we weren't totally thrilled with the interface, finding that the buttons weren't always the most responsive to anything besides a really hard press.
The Koios does include a pump attachment for sealing rigid containers with small holes as well, earning it a few more convenience points.
For our delicate foods metric, we scored each kitchen appliance on how much control you had when manually sealing an easily squashed item — white bread, in our test case. We looked at both the ease of pulsing the vacuum on and off and how finely you could control the amount the bread was squished when comparing performance between products. The Koios did very well, meriting a 7 out of 10 for its results in this metric, which constitutes 20% of the final score.
The controls are very simple to pulse the operation of the Koios, with the vacuum starting and stopping off of the "Vac/Seal" button. This also makes it easy to pretty precisely control the amount of vacuum and not squash your food. However, the Koios can occasionally fail to respond to your button presses, squishing your food considerably.
For the final metric, we measured the actual strength of the vacuum using a dial gauge built into one of the usual bags. The Koios finished with a slightly above average performance, earning a 6 out of 10 in this metric, which is responsible for the remaining 10% of the total score.
The Koios managed to pull a vacuum that registered as 17 inches of mercury on the gauge — slightly better than the group average of 16.8 in. Hg.
This vacuum sealer retails at a solid price, but there are less expensive models that outperformed it.
Overall, we didn't overly dislike the Koios — though it is a bit slow — but were simply uninspired by its results and it failed to distinguish itself from the group.
— David Wise and Austin Palmer