I believe your stove is a Double Comfort DC-250 made by Energy Division - Easter Metal of Elmira, Inc. 1430 Sullivan Street, Elmira, New York 14901.
I am presently installing what looks like an identical stove today at my farm in Chemung, NY. I bought the stove from my neighbor whom has provided me with his original purchase receipt dated March 6,1982 denoting purchase price of $520.00 plus tax.
My neighbor has provided me with a complete documentation file. This includes original warranty certificate denoting model number DC-250, serial number 20-137, purchase date March 6, 1982. Also included is the original ten page installation and operational instructions. This install/operational instruction manual includes diagrams denoting recommended spacing etc. The operations instructions are well detailed. Also included is a disclaimer sheet advising how to prevent damage to the glass viewing port, suggesting to tighten knobs on the glass retaining frame only to where they touch the frame.
Elmira, NY is about 20 miles west of my farm. I'm not sure if the original manufacturer is still operating, and if so in what capacity. The install manual says Energy Division - Eastern Metal of Elmira Inc. 1430 Sullivan Street, Elmira, New York 14901 (607) 734-7158 "Manufactured with your comfort in mind."
The original purchase receipt says: Eastern Metal of Elmira, Inc. Manufacturers Of Traffic And Safety Signs. Industrial Park-Sullivan St. - (607) 734-2295 Elmira, NY 14901 There is a hand entry denoting: Energy Div 734-7158
I will be scanning the complete document file for my records. My email address is firstname.lastname@example.org