My local fireplace store is coming out on thursday to look at a couple things. Due to the style of the stone with the hearth it wasn't possible to get a flush/clean seal for the surround of my insert. It didn't bother me at first but after 2 yrs it does. Not to mention it's impossible to get the surround out to try and clean it because it is behind the edges of some the stone. Also, want to see about extending the pad out so the blower assembly is level and doesn't rattle on hi and up, again to try and seal the surround better. It never occured to me til a couple weeks ago, but I wonder how much heat I've lost with these gaps? Also have a couple paint issues on my 450 Kennebec. Small spot on my door changed colors and the blower assembly sides the paint has flaked off and almosts looks like it surface rust. I got to thinking what the upgrade cost to the Rockland 550 might be. I wouldn't mind the increased btu and burn times but wondering if it would really be cost effective? I suspect my lower burn times are 99% tide with less than pure seasoned wood however. To be fair, my house is 1950sqft 1.5story. The 450 on the far east side of the house with cathedral ceilings and does a pretty good job at heating it (68-72) all on it's own. This is using wood cut and split for only 6 months and being a greenhorn operator, despite reading countless threads for the last 2 yrs on how to better run it. Thoughts anyone?