I currently have a intertherm pre fab fireplace in our manufactured home that was built in 2004. I am wanting to take out the fireplace because it is EXTREMELY un efficient providing almost no heat to the house. I was wondering if I will be able to use the excisting chimney system from the ceiling support box up, or will need to replace the whole thing? Also I am looking at the US Stove Co. model 2000 to heat a 1800 square foot home? Does anybody have any insight into this stove good or bad, or maybe something better? Thanks for the help in advance.