The temp control on the rear will control the amount of heat you require to heat your home and keep it steady. The slide on the door will allow you to fine tune just how steady the fire will be, If you get down and open the slide slowly you will see moon phases, quarter moon half moon and wide open full moon, run the stove with about an 1/8th moon to start and you will see the flapper hooked to the temp control on the rear will stay pretty steady compaired to having the slide completly closed. Now for a couple of fixes to fine tune your stove, check the slide on the door and make sure it is fairly snug by tightening the nut on the inside of the door till you have resistance on the slide, this will let in less unwanted air. Also look at the hole in the side of the stove where your grate shaker comes through the stove, you have a square peg in a round hole unwanted air will come in to the stove giving you a hot spot in the coal right there, easy fix, go to your hardware stoor and get a flat washer with a 1" hole, file the hole in to a square that just fits over the knob sticking out your stove that the shaker handle goes on, slide the washer up against the stove. Now for your shaker handle, drill 2 holes in the square 1 in each adjoining sides and tap and put in set screws so the handle is tight against the washer and so you don't wear out the square on the handle, as you can tell the handle doesn't fit very snug. Hope this all helps and gives you a good start with your new stove.