Sorry, late to the party on this one, but I am in a very similar situation with the same model of fireplace (Selkirk 832) and same location (Ottawa), so don't see the point in starting a new thread.
We bought or house about 6 years ago, it was built in about 1970 and I am guessing that the fireplace and chimney are original or close to it. We have never used the fireplace as the chimney was pretty rusted out when we bought the place. I originally bought a stainless steel chimney second hand, but in good shape, planning to replace the existing one, but never got around to it. Now the wife is compaining that the basement, where the fireplace is located, is too drafty in the winter. Like many of you, we had a long and hard winter this past year, so now we are looking for options to replace the fireplace and/or chimney. Our options include an insert (wood or natural gas), a new fireplace install or possibly just replace the chimney.
Of course, every company we contact recommends removal and new install, but that is $5-10k and it will be impossible to match the brickwork with the rest of the basement. You can see from the attached pictures, most of our basement is brick, including the fireplace. When we moved in, we painted the bricks and installed new floors, so I don't want to go messing with a new install now if we can avoid it.
Any advice would be appreciated.
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