I have an Englander 13. My flue pipe is double wall and chimney is class A. My interior flue temperature is always at least 100 degrees higher than the stove. That's with secondaries or without. I have seen on the forum where everyone's stove is usually hotter than the flue when the secondaries start and the primary is turned down. It just seems like I'm loosing a lot of heat. Anyone else have this issue or have any solution?