I finally realized the wood stove in my shed at my new to me cabin is a Haugh S-121, that the WH is a Cdn gov't tester, with a Smoke Master by Dorwood. I haven't found the serial # yet I had to reach behind with my cell to take several pics of plate. I still don't see a pic of a 121 online. I can't open the door; I'm assuming it lifts up. Should I hit it with a hammer? worried about damaging. I want to find out if I can use this in my cabin. Currently, another vintage stove model, Super Chalet, heats it. I can't read the product plate on the back so I don't know who makes it. The Super Chalet has no problem heating the 860 sq. ft. I'm expanding to 1200. I would prefer to use the Haugh bc it has a window so I can see what's going on inside. Anyone know much about them? Could I get a glass window door for the SC?