Greenhouse effect, heating of the seas, climate change – subjects like these increasingly dominate public discussion, demanding responsible action of every single person specifically in the areas of energy and heat generation. Use of regenerative fuel being part of this is a factor that only few are aware of. In contrast to fossil fuels such as coal, oil or gas, wood offers clear advantages: when wood burns, the carbon dioxide amounts resulting are no bigger than those that would be released if the same wood were rotting in the forest. Wood is a naturally re-growing resource that takes up carbon dioxide (CO2) from the air in saves it in its cell walls while growing. When wood is burnt, this precise amount of carbon dioxide is released again. In addition to this, the resulting carbon dioxide is immediately taken up by re-growing trees, thus being returned to the natural carbon dioxide cycle.