I purchased an Empyre Elite 100 wood gasification boiler in Dec. 2010. with use beginning in the 11/12 heating season. I developed a boiler leak in Jan. 2013 due to creosote corrosion. In the attached photo, the area that failed was near the front right just below the side row of firebrick. The cutout shows roughly the extent of the corrosion and clean appearance of the inside of the tank.(my water tests were perfect) I believe the corrosion was caused by creosote formed in the upper burn chamber flowing down the inside wall and accumulating behind the firebrick. Just below the damaged area is a duct directing air to the secondary burn chamber and you can see it has an opening at the top which allows air to escape behind the firebrick. I believe this oxygen source combined with the creosote is why the corrosion was so bad in this area. Has anyone else seen this problem? If you own one of these units, I would suggest you check under the firebrick in this area next time you shut down.