Hey guys, I am thinking of changing my regency medium sized insert out and purchasing a free standing stove. I would think I need a rear venting stove so that I could vent to my existing flue in my fireplace. My dementions on my fireplace opening are 25 inches high and 36 inches wide. Also 18 inches deep. I was thinking of placing the stove in front of my fireplace opening. Any recommendations?I am trying to heat most my house which is about 2000 square ft. No insulation and drafty house. Any help would be appreciated. Oh yeah I have a six inch flex vent in my fireplace flue so I would like to reuse that.