Kiinde Kozii Review

The Kiinde company was founded by two MIT engineers (and dads) who envisioned an opportunity to improve infant feeding via a unique bottle warmer. From there, the lineup expanded to a complete system that includes the Kiinde Squeeze baby bottle whose Kiinde Twist Pouch hooks up to any breast pump via a variety of adapters for direct pump-to-pouch expression. The uniquely designed Kiinde Keeper accents the system with a freezer storage solution designed to avoid bag puncture.

Performance Comparison

Health and Safety

About half of the competitors earned better scores for health and safety. We monitor content temperature over time to determine how hot the contents get and whether or not they pose a potential risk for burns, scalding, or nutritional degradation. When temperatures reach over 104F, the nutritional content of the milk can begin to degrade. So, our tests record how quickly the bottle contents reach or surpass this when used under conditions similar to those used by the average caregiver and the instructions. At the highest setting, around 8.5 minutes, the contents in the bottle with Kozii managed to reach body temperature. The highest observed temperature, using the manufacturer's instructions, was 105.29. If you leave the bottle in longer than advised, that temperature can reach up to 122 degrees F at 15 minutes. This is something you clearly want to avoid for multiple reasons.

Warming Efficiency and Consistency

The Kozii performed better than average for the group and close to the top for consistency. These tests were run using the instruction manual guidelines and monitoring the bottle contents' temperatures over time to compare temperatures at different times. At 12 minutes run time, the temperature range of the contents for the Kozii was 86-93F degrees. Seven degrees of difference is much less than some competitors with more than 15 degrees of separation.

Quickness of Warming

The Kozzi struggles to heat quickly using the manufacturer's recommendations. It earned one of the lowest scores in this metric. At auto-shutoff time, the average content temperature was only 70 degrees F, not coming close to the desired 98F. Even when we let it run for 12 minutes, it only reached 89F on average. While most babies will accept this temperature, if your little one is breastfed typically, they may be looking for closer to 98. The highest temperature we reached using the recommended settings was 93F. While you can feel pretty comfortable that you won't be overheating contents, it will be hard to wait more than 12 minutes to get the best temperature.

Ease of Use

The Kozii is super easy to use and one of the easiest in the group. The directions are straightforward, with warnings and a lot of subtext. It is not complex, and there is one dial to worry about. The main warming chart is on its own pamphlet, and while it is easy to keep on the counter, if you lose it, your manual will be no help to you.

You always use the same amount of water, and you can do several warming periods on the same water, which could be good for those who warm every bottle or have multiple babies. This option is easy to use with one hand if you're holding your baby in the other, and it has auto-shutoff.

Ease of Cleaning

The Kozii is middle of the road for ease of cleaning. It is not a standout, but it isn't terribly challenging. The cleaning directions are really involved and include more steps than most of the warmers. However, we suspect it might also be cleaner as it includes a bleach and water solution soak every 2-3 days, while others are largely wiping clean and occasionally descaling. If using bleach gives you pause, then it likely isn't the best option for you. Cleaning also includes descaling every two months with vinegar and water for 10-20 minutes. We like that the duration of descaling is short and is unlikely to interrupt your regular warming schedule.

Should You Buy the Kiinde Kozii?

Unless you have the entire Kiinde system, we think there are better warmers in our lineup, according to test results. It is easy to use and clean with a consistent warming temperature, but it is super slow, and we suspect many parents will grow frustrated with how long the process is. Pair our results with the higher price, and we think that most warmer goals can be met with higher-performing or less expensive options.

What Other Bottle Warmer Should You Consider?

Our consistent, easy-to-use, and protected nutrition favorite is the First Years Gentle Warmth Digital. This warmer is reasonably priced, fairly consistent in its heating, and quicker than the Kozii. The Chicco Digital Bottle Warmer & Sterilizer also performed well in our health and safety tests and is one of the easiest in the group to use. Which option is right for you will depend on your goals and budget.

Manufacturer Video