I own 2 Lopi Leydens installed profesionally in 2007. When I went to prepare one of the stoves for the 2008 season (October) I was flored to find the heat exchange tubes all rusted as well as the area behind the fire brick was all pealing and rusted as well. The dealer had never seen this before and after negotiating with Travis Industries replaced the stove. Thinking this was a fluke I opened the replaced stove to prepare it for the 2009 season and have found it beginning to do the same thing! The other stove has begun to do it as well! I have followed the the maintenence manuel thourly during the heating season and have been very maticulous about keeping it clean. I have cleaned out the flew pipe seasonally and can't figure out what is causing this to happen. Please help! Is this Normal?