Hello everyone - I have a 150 year old home with unlined chimneys; just brick and mortar. I just bought a harman mark 3 coal stove for the basement to help with my heating bill since I payed around 500 a month last year to the gas company during the winter months. My chimney is around 33 feet tall from the basement. I have gotten differing opinions from 2 installers on what I should do to vent the stove. On one quote, the installer said that I should use stainless steel pipe with the wrap insulation and wire mesh up the chimney. The other installer said that using stainless steel pipe for a coal stove is not an ideal situation since it would need to be replaced in around 6 years. I've not heard of this before, but he specializes in relining the chimney by placing a "sock" down the chimney, then pouring some material down the chimney(I don't know what this material is), then removing the sock a couple of days later. He said that my chimney is so big that he has room to put 2 "socks" in there to create 2 flues. He also said that this method will reinforce my chimney since its so old and is a one time deal unlike the stainless steel liner. I'm hesitant on getting a stainless steel liner that I will have to replace in 6-7 years, but after reading on some headaches of keeping the coal stove burning, wonder if the stainless steel liner would create a better draft due to its heating up quicker. Your help is appreciated.