TechGearLab

The Keylitos Sous Vide Cooker is one of the least expensive options in our test suite. It heats up quickly &mdash; from 48° to 147° in 38 minutes &mdash; and is one of the fastest in our test suite. It also heats back up after dropping frozen food in it within 35 seconds, while lower-performing models take two to 12 minutes. Like some of the more expensive models, the Keylitos is protected by a waterproof rating of IXP7, protecting it even when completely submerged. 
touch button presses. A long press will adjust the time by three degrees and the temperature by 30 minutes, while a short press changes the time by one minute and the temperature by 0.1 degrees. The long and short presses take a little getting used to, and adjusting the temperature by such small increments can take a while, but the learning curve is quick and, overall, a very small price to pay for this low-cost sous vide. It is also worth noting that the attachment style is a large plastic clip. It has steps to ensure you have some control over the submergence level, but we prefer a screw clamp. If you are looking to break into the world of sous vide cooking and would still like to have enough money to buy a nice cut of meat after, the Keylitos is the perfect option. 
Read more: Keylitos Sous Vide Cooker review

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This model is not the most elegant option, but it is efficient and inexpensive.

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The KitchenBoss G320 is not only competent and versatile, but it performs exceptionally well for such a budget-friendly device. It circulates the contents of a 9.5-quart container in a remarkable 12 seconds flat. This, paired with an efficient heating element, achieves an extremely fast heat time of 37 minutes and the ability to hold a very stable temperature over the course of your cooking. The dial-button combination interface is easy to use, complete with 20 recipes with pre-programmed times and temperatures. With a smoothly spinning screw clamp, it is easy to securely fasten to any container, and the IPX7 waterproof rating ensures that the delicate interior machinery is safe from moisture &mdash; even if it becomes completely submerged. 
Our only issue with the KitchenBoss is the magnetic dial. The dial is attached to the sous vide through magnetics, which is done to achieve the IPX7 waterproof rating. The magnets tend to get a little sticky, which makes it difficult to control the temperature. This inconvenience is a small price to pay for the performance of the KitchenBoss, as well as its amazing waterproof rating. Whether you are a seasoned sous vide chef or you're looking to break into this amazingly convenient way of cooking your proteins and veggies, the KitchenBoss is an excellent purchase. While it not only offers up the highest level of performance, it is also one of the better-priced models in our fleet.
Read more: KitchenBoss G320 review

If you're on the hunt for a decent sous vide machine on a shoestring budget, check out the VPCOK Sous Vide Cooker. This immersion circulator is one of the most affordable out of our test group and proved itself capable in our temperature stability assessment. It delivered one of the best performances in our circulation tests and was one of the fastest when it came to initially heat the water. The controls are also very intuitive and user-friendly. 
On the downside, this unit turned out less than desirable results in our temperature accuracy test. It had an average discrepancy of 1-2 degrees under the set temperature in both of our tests, and the plastic clip can be finicky and hard to attach to containers with a lip. While these are no insignificant flaws, they aren't insurmountable, and we think this is a great bargain option for those shopping for a new sous vide on a limited budget. 

Sous Vide Cooker Comparison