We are in the process of replacing an older slammer fireplace insert in our cabin in northeast oklahoma. We are interested in the Osburn Matrix as we like the more modern aestetics, non catalytic, as well as being eligible for a tax credit. This unit will fit in our fireplace however I am slightly concerned now that it will put out too much heat. Our cabin is about 720 sq ft and poorly insulated, winter usuage would be 30's-40's. Can we build a slightly smaller fire on this unit to keep from cooking us out? Any feedback from anyone currently using this model is appreciated. Thanks, Danny