One of my co workers just installed a pellet stove last weekend. Yesterday the temps were in single digits so his stove, as was mine, was cranking. His neighbor saw through the window what appeared to be the living room on fire and called the fire department. Turned out it was just a large flame in the stove. I know when I drove in my driveway last night with all the lights out in my house the living room was glowing. The stove was at a point where it was at high output. Quite a light show.