I just ordered a gds25, and even after reading the pdf manual, I can not figure out how this thing works. It has an ignition box/brain and a pilot light. Does the pilot light remain on all the time? It has a flame sense rod (like a furnace) that runs back to the brain. It needs either the a/c adapter plugged in, or 2 d cells as a backup to operate. Yet it does have millivolt control. Anyone have experience with this setup? I bought it because it is the ONLY (that I could find) stove that puts out over 20K btu that direct vents out a straight 24" pipe with no vertical rise needed.I needed that feature to exhaust out below a window on which the stove is centered. It seems like a fairly high quality unit. I can not find much about the napoleon name around here.