Look for a stove rated at more like 12k BTU per hour continuous. The heat rating is a lab value, not one you are likely going to be able to duplicate, and there are likely to be times you will want your home above 60 degrees.
I think some type of mass heater is going to be the only way to have a small fire bit still carry heat for a long time. I've been in uninsulated wood fired saunas before and a pile of Finnish stone (may have been soapstone) would carry heat for several hours on a single firing. The stove wasn't very big either. I would imagine in a insulated structure that can be heated by a kerosene lamp you could carry heat through most of the night. Google masonry sauna heater and you can see some pretty neat ideas.Interesting idea, something using mass to achieve a flywheel effect might work if sized right. Maybe a small rocket stove mass heater?
http://www.richsoil.com/rocket-stove-mass-heater.jsp
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