One thing I've noticed is that those with complaints seem to indicate an inability to control their burn, dampering down and closing the air control does not seem to bring the fire under control. This indicates an air leak (or possibly excessive draft though this is less likely).
As for VC telling people a little glow is OK - well I have no idea about that, but I can say that the lower back corners are protected by the rear heat shield, I can also say that I have never seen this glowing before on mine, not the corners, not around the collar, and certainly not the heat shield. I don't think it can be all that common or more than one person would have mentioned it here (and again technically our man here did not describe what VC says is OK anyway). May also be worth noting that I have NO crimps on my flue pipe where it enters the flue collar (or anywhere else for that matter, its a non-crimping brand: 22 gauge HeatFab Saf-T pipe, which I definitely recommend). I can easily see where this might be a problem for some installs, the flue collar is not very deep, I wouldn't want any crimp on that piece. Unfortunately there is nothing specific about this in the owners manual as Gooserider mentioned (or perhaps worse, they talk about inserting a crimped end) - this is something VC should clarify in future manuals.
As for VC telling people a little glow is OK - well I have no idea about that, but I can say that the lower back corners are protected by the rear heat shield, I can also say that I have never seen this glowing before on mine, not the corners, not around the collar, and certainly not the heat shield. I don't think it can be all that common or more than one person would have mentioned it here (and again technically our man here did not describe what VC says is OK anyway). May also be worth noting that I have NO crimps on my flue pipe where it enters the flue collar (or anywhere else for that matter, its a non-crimping brand: 22 gauge HeatFab Saf-T pipe, which I definitely recommend). I can easily see where this might be a problem for some installs, the flue collar is not very deep, I wouldn't want any crimp on that piece. Unfortunately there is nothing specific about this in the owners manual as Gooserider mentioned (or perhaps worse, they talk about inserting a crimped end) - this is something VC should clarify in future manuals.