very much info in this post. burning wood isn't for the unattached mentality. if you run a cold stove you risk a fire that will need fast intervention or the chimney will overheat and the house will catch fire. to many sparks and you risk a roof fire if you have cedar shingles especially. a poorly constructed or to big of a flu will have draft problems etc. a good double or tripple wall stove pipe flu that has a dampner will draft efficiently and the stove and flu will burn will be hotter longer and be easy to lite and the creosote will not collect in the flu as bad. a catalytic in the stove will just get more heat for less money. funny thing is that during the 1970 era inflation event i remember installing all kinds or stoves inserts etc as people tried to get by and stay warm,the modern stoves inserts are so much better safer than those were. i have helped extinguish some chimney fires and once you see just how dangerous one is you will never forget. so pay attention to the installation and learn how to keep a fire. also learn how to sweep your flu.I have a Country Flame wood stove in my house and paid 400 for it and my rent house next door has one my first renter put in that his grandparents gave him.
I got a free one off craigslist a bigger country flame and I have loaned it to 3 friends and the first one never used it and second buddy i helped him slide it into the fireplace and he heated his home with it all last year.
Now the 3rd friend has it and I installed it the same way I did any of them.
Wire the original flue wide open and slide the wood insert into the fireplace.
Then put the fiberglass insulation and bolt the steel plate trim in place and push the insert in until steel plate sits flush against the bricks.
I never had any issues with the existing chimney.
If it works for an open fire it will work with an insert.
Each type has a learning curve as to how much heat is needed to get a good draw and not smoke up the room when you first light it.
If you open the doors to make a fire and cold air rushes down the chimney into the room
you will get smoke in the room if you try and light it.
That is my issue with my 2 story house and tall chimney.
The fix is i take a propane torch that I anneal with and place it in the fire box with flame pointing up and out of the chimney hole and this heats the air in the chimney and gets it to begin drawing up after 3 minutes or so.
Then I can make my fire.
Now another thing to be aware of is if your clothes dryer is on and venting air out of the house this can draw smoke from the initial starting of a fire in the wood insert.
Things to think about.
You can get glass shipped to your door from places that make glass for these inserts if you find a good one for cheap with busted or missing glass.
Now that BTU rating of firewood is misleading.
If I burn Oak or Hickory or Pecan I can't generate the heat that Pine or Cedar or Fir generates.
Unless I cut the hard woods smaller.
Hardwood burns longer and has more BTU but FLAME is needed to heat that steel box and I get more flame from the quick burning wood.
Mother-in-law had an insert and always burned oak and father-in-law bragged that he could burn 1 log all night.
He did not heat his entire house with his stove just that room and dining area.
Mother-in-law asked what I used to clean the glass in my stove.
I told her I just wipe it with a paper towel if it gets a little sooty.
Dry crumbles on mine.
She said NO I tried that and my glass is always black and is thick and gooey.
Yea you smoldered a log all night not burned it all night and you gooed up the entire chimney and fire box.
I went over to their house with a trash can full of cut dry cedar and told them I will make a fire in this stove and it will be hot and will clean all the goo from everything and it will smoke up the entire yard and down the street.
That cleaned it and they got a lesson in dry vs wet green wood for burning.
Get one you will not regret it.