Cut the downy serviceberry into equal-sized pieces about a foot long and 3 to 4 inches wide.
Place three to four balls of crumpled newspaper in the wood-burning stove or fireplace. Set the kindling over the newspaper in a crisscross pattern.
Light the newspaper with the match, and let the kindling catch.
Add the downy serviceberry to the fire, one piece of wood at a time. Add the wood slowly to avoid smothering the fire. Allow each piece of wood to ignite before you add another piece. Add two to three pieces of downy serviceberry wood in total at a time.
Close the door to the stove or fireplace once you've added the downy serviceberry firewood to the fire. Adjust the air control vent to produce the heat output you desire from the stove or fireplace.