Looking to buy a Quadrafire 5700 wood stove to heat my 2400 sq foot house. Currently have a Osburn 1800 and it is in the basement and may be a bit too small to keep up heating the house. Am going to look at a used Quadrafire 5700 wood stove and am seeing some concerns with metal issues. Should I shy away from the Quadrafire 5700 and is there a particular area to inspect for metal damage, and lastly are only certain areas afflicted with the problem?