Pellet burning stoves for the most part look like normal wood burning stoves. But the stove components are much more sophisticated. Pellet Stoves use wood pellets as its primary heat source. These wood pellets are tightly compacted and dense which causes it to be burned very efficiently and powerfully. Pellets usually come from the byproduct of sawmills and are very easily transportable due to their size (about half and inch) and their weight.