Know I am little nuts but! Have a 300 sq ft sun room with concrete floor with radiant heat. Would like to have small wood stove more for aesthetics then heat. On 10 to 20 degree day with sun, it can get to 76 pretty quick after radiant heats room to seventy overnight if you do not draw shades. Any ideas on small stove that could put out less than 18 to 20 K BTU's that would not overheat the room?