Thanks for the reply.Welcome. Looks like it might be a heatform metal fireplace. You can put in an insert or a free standing stove depending on the fireplace's firebox front and rear dimension.
The Englander 13 NCi is an affordable insert that looks like it would fit there. It will require a 6" stainless liner. How tall is the chimney?
http://www.homedepot.com/p/Englander-1-500-sq-ft-Wood-Burning-Fireplace-Insert-13-NCI/100638341
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