Approximately 3 years ago I had 2 wood burning inserts installed in 2 different rooms in my house. The smaller unit was an Osburn 1100 which I have no problem with. The second unit was an Osburn 2400 that is in the main living area. I burn about 30 cords of wood every year. I have been burning mainly ash from my property. I have a temperature gauge on the insert and keep the temperature between 500 and 550 degrees. The baffle is so badly warped in the middle the firebrick are sagging. The air tubes also look pretty bad. The installing company wants $ 500.00 just for the parts. They told be the manufacturer said the only way these would fail was from over firing. That is not the case. It occasionally reaches 600 to 650 degrees but that is for a very short time. I don't want to use this insert until the parts are replaced. I thought all of the metal had a lifetime warranty. Parts are ordered because I want to use it this winter. The metal warping didn't happen until last winter. I was told I can keep this insert fired up as long as I want and that is what I do. Does anybody else have any of these problems with any of your inserts.