I am currently running an Englander add on wood furnace which is plumbed into the ductwork of my house. I am looking to upgrade to a more efficient gasification wood furnace. I have found many indoor gasification wood boilers but not many forced air furnaces built in the U.S. or Canada. I don't really want to have one shipped from Europe but would consider it. Is anyone running an indoor gasification furnace or know of a quality built brand?