OK, here are a couple good examples... 1)You dump crappy pellets in your hopper. For whatever reason, they're not particularly flammable. You crank her up to flamethrower. The stove says feed feed feed!..but the pellets aren't burning well. The ESP says "I'm not hot enough, feed MORE pellets!" What happens? Unburned pellets in the ash pan. Lower the feed rate. 2) You dump extremely flammable pellets, but low BTU for whatever reason, into the hopper. Set it to flamethrower. The fire looks pretty good but the ESP is now saying, "I could be hotter, but my feed rate is only on 2! WTH, I'm better than this!" What happens? You get less output than your stove's capable of. Turn the feed rate up.