The site has detailed reviews of the best bottle warmers on the market. Bottle warmers are often used to quickly and efficiently heat up frozen or thawed milk from the refrigerator or freezer. Using a microwave can damage the nutrients in the milk and create an uneven heating. Using a pan full of hot water is a tiring exercise because it require you to monitor the temperature of the milk at all times to prevent any overheating. The bottle warmer is a great hands off solution to warming milk perfectly everytime. Most bottle warmers are extremely easy to operate and only require you to calibrate the setting to fit how much milk you want to heat up and the machine will do the rest of the work.