Im a rookie and want an insert for our majestic 36. Ive looked at several buck stove model 18. It will fit with ease. The stove just looks to small IMO and im not sure it will keep up with our open floor plan. Any other suggestions as most installers in ga only carry buck and a few others and the buck is all they have offered. The house is roughly 3000 sq ft and the buck only heats 1200 but it has to be better than the fireplace I have. Open floor plan with 20 ft ceiling in living room where the buck would be located. My opening in the fireplace would be front opening 32" back 20" height 181/2 and dept to face of rock 19". We dont want a free stander. Thanks for any advise.