Baby bottle warmers are divided into three categories. First, there’s the standard home bottle warmer, which sits on your kitchen counter and warms your baby bottle using steam. The second option is to use a home bottle warmer system, which entails heating a kettle of water in which your bottle is placed. The third option is a travel bottle warmer that either plug into your car or uses a thermos filled with hot water in the morning. Most parents choose the second and third choices in order to enjoy the convenience of a home and travel bottle warmer.