Wood burning stoves have been around for a long time, but they’re going through many changes as technology advances. These systems usually come with a fixed grate and a flat base, and are super easy to use: the ash is collected at the base and new logs are placed on the top when needed. The bed of ashes actually helps the logs combust more effectively, for maximum heating efficiency. Wood burning is also environmentally friendly: the process releases roughly the same amount of carbon dioxide that a tree absorbs while growing, as long as you make sure to purchase wood from a certified supplier who ensures the replacement of cut trees. Therefore, wood burning is considered carbon neutral and provides sustainable, green heat. You can achieve maximum sustainability (and save more money) by using your own waste wood, if you produce any. However, you will need to season the logs in order to dry them.