Tips & Good Things to Know Use dry hard woods for best results, Wuhan you first use your fire pit, the unique double-wall airflow within the unit will take approximately 5-15 minutes to achieve full efficiency. The more evenly your fire burns inside your fire pit, the more prominent the flame pattern showing the secondary combustion will appear. User Warnings 1. Solo Stove fire pits are for outdoor use only and should not be used in a building, a garage, or any other enclosed ares. 2.