Can I reuse unburned pellets from the ash pan?

While there may be pellets that look unburned in your ash pan, never place these pellets back into the hopper. Items in the ash pan could still contain hot embers that can cause fuel in the hopper to accidentally ignite. Instead, all debris from your stove should be placed in a metal container with a lid, away from any items that are at risk for catching fire or burning.