Kimberly and Katydid burn regular cordwood, although given the size of their fireboxes, cordwood should be cut shorter than for stoves with larger fireboxes.At the home offices of Unforgettable Fire, LLC, extruded sawdust logs are burned almost exclusively for two reasons.  First, because they are readily available, and they do not have to source, cut, split, or properly store firewood.  Second, because they offer a consistently low moisture content for testing purposes.Should you choose to burn extruded sawdust logs in your Kimberly or Katydid wood stove, never burn sawdust logs which contain waxes or paraffins.