The Boon Orb (around $18) comes in a fun shape with a retro white and green design that looks great in your kitchen or even in your child's bedroom. It includes a graduated tube that makes it easy to measure the perfect amount of water, and also has an insert for baby food jars.
The Maxx Elite Smart (appx. $50) has a "steady warm" feature that keeps milk at a constant temperature, so you don't have to wait until your baby is screaming to start warming a bottle. For convenience, it shuts off automatically when the water is running low.
Dr. Brown's Deluxe (about $31) features an adjustable basket that lets it hold a variety of bottle sizes. For convenience it has a temperature alarm, and a water chamber that is large enough to warm several bottles before it needs to be refilled.
The First Years Night Cravings (about $24) offers convenience with a removable rear cooler that keeps two bottles cool for up to eight hours. It comes with a water vial you can premeasure, so you don't need to make an extra trip to the kitchen in the middle of the night.
Parents on the go can rely on the Tommee Tippee Travel (around $8) to work safely without needing to rely on electricity. The inner thermos keeps water hot enough to heat a bottle for 8-10 hours, and the outer plastic cover is sized perfectly for most standard and wide bottles.
The Baby Brezza Safe & Smart (around $59) has Bluetooth connectivity and a free app that alerts your phone when your baby's bottle is ready. This is a convenient feature, but you can't turn the unit on from the app after the auto shutoff kicks in, so you can't start it from your bed.
The Born Free Tru-Temp (around $49) includes a handy detachable insulated cooler, and only needs to be refilled once per day. The dial offers preset warming times based on the bottle size, so it turns off automatically at the optimal temperature.
The Kiinde Kozii (around $46) creates a flowing warm water bath to gently heat formula and even thaw breast milk in the manner that experts at the CDC recommend. When the auto shutoff feature engages, the water drains from the reservoir to help prevent overheated bottles.