The idea of wood as energy resource is an ancient idea. Mankind always warmed at wood fire. Our current data explain why this did not happen by accident. Out of the biomass based renewable energy resources thermal energy can be generated from wood in the most efficient way.Traditional wood heating used to be a true science. All the activities that it assumed – wood transport, kindling, guarding the fire – can hardly be learnt again. However, it always had a few disadvantages. That’s why it has become unfashionable for a while. It gave place to more expensive, environmentally harmful and not renewable fossil energy resources. Compared to these “dead” energy resources wood is in fact more difficult to feed and its moisture content and specific volume is higher. Pellet is 100 % natural wood or 6 mm diameter cylindrical granulate pressed from biomass raw material, respectively, that has excellent burning features. Wood pellet is made from sawdust and shavings pressed under high pressure. Lignin serves as binding material which is naturally present in wood and which separates during pressing and does not contain any artificial additives. The amount of carbon dioxide released during burning pellet in the special furnace is not more than the tree had absorbed during its lifetime and which would be released during natural dry-rotting anyway – thus it does not increase the volume of harmful substances in the air and restrains greenhouse effect. It can be reproduced as a renewable energy resource thus there is no danger that it becomes exhausted as opposed to fossil energy resources. The use of pellet has suddenly increased in Western Europe in recent years and more and more people are converting their heating systems to the economical, comfortable and safe renewable energy resource. What is pellet? Pellet is 100 % natural wood or 6 mm diameter cylindrical granulate pressed from biomass raw material, respectively, that has excellent burning features. Wood pellet is made from sawdust and shavings pressed under high pressure. Lignin serves as binding material which is naturally present in wood and which separates during pressing and does not contain any artificial additives. The amount of carbon dioxide released during burning pellet in the special furnace is not more than the tree had absorbed during its lifetime which would be released during natural dry-rotting anyway – thus it does not increase the volume of harmful substances in the air and restrains greenhouse effect. It can be reproduced as a renewable energy resource thus there is no danger that it may become exhausted as opposed to fossil energy resources. The use of pellet has suddenly increased in Western Europe in recent years and more and more people are converting their heating systems to the economical and comfortable renewable energy resource that has a safe supply.