mgambuzza wrote:Coal stoves are not the only ones subject to the rusting. I have a Quadrafire Castile Pellet stove and the cast iron plates on the back, as well as the steel plates on the side rust terribly during the summer. This happened months after I bought the stove and the manufacturer said it was normal, and I would have to do an annual sanding and painting on the inside to keep the good appearance before the next burning season. Although disappointed (it is in a very visible spot) I now do this annually and it does maintain the appearance through the burning season. At least the spot you're talking about doesn't seem to be as sightly as mine.
Take a look under the hood of any car that still uses cast iron exhaust manifolds or regular steel pipes RUST
it's the unavoidable nature of the beast