The US Stove model 22001 fireplace insert is a very good wood burning heater. Like so many claims of products sold today, you have to take with a grain of salt. The claimed BTU output and the total heating area are inflated. Even the EPA card that comes with the stove shows a BTU rating less than half the advertised rating by US Stove. But then maybe the stove is able to achieve the advertised rating with some kind of wood that most of us do not have available! With red or white oak firewood the stove puts out good heat. It took me about a week to get the formula correct for the most heat from the least wood. The wood needs to be dry; aged for at least a year outside with a cover on the top. Fresh cut wood is difficult to burn. Also it is best to cut the wood about 16 to 17 inches long. Anything longer and you will have to stick one end around the edge of the door opening for it to fit inside. The cavity is small! I have discovered that one needs to have a good bed of hot coals before adding logs. I have found that splitting logs into smaller sizes burns better. About a 3-4 inch wide piece of wood works best. When starting a fire, open the damper full to the right. Use very thin pieces of soft wood (kindling) to start the fire. I use a triggered propane torch to light mine. With the door barely cracked open, let the kindling get a good burn going until it starts to make coals; then add larger pieces of wood and close the door. I have three different types of wood. Kindling, pieces about 1 to 2 inches, and logs about 3-4 inches. Once you have the logs burning for 1/2 hour, turn on the fan. For hotter output leave the damper all the way open. For a warmer, longer burn close the damper some. I usually close the damper about 1/3 to 1/2 during the day and all the way at night. The more the damper is open, the more wood used. With the damper about 3/4 open I use about one 3-4 inch X 17 inch log every hour. At night I can load about 3 logs in it and it will put out heat for about four hours. There are still hot coals in the morning, but no heat. I believe that heat from the stove would fill the room better if the 150 CFM fan were boosted up to a 200 or so CFM fan. I installed this stove in an existing fireplace that used three times as much wood and put out even less heat. I am heating an area that is about 950 square feet with an 18 foot vaulted ceiling. The stove can keep the room at about 68 degrees when the outside temperature is 30 degrees. Installation went very well with the only time consuming stage was fitting an adaptor from the stove to my stainless steel flue. It is a well built American made stove that I would recommend as a replacement to an existing open hearth fireplace. If you do not have free access to wood, as I do, then I would suggest a pellet stove insert. I have one in my master bedroom and it puts out masses of heat with little attention - just add pellets every other day or so, and clean out the ashes every few days. Of course you do have to purchase pellets!