hi does anyone here have the newest Harmon XXV tc? This is the one with the touch screen. I'm wondering how often I need to clean out the back of the stove. It's in a tight corner and hard to reach. Also the manual doesn't really explain how to take the back off. There are screws, but the manual says something about thumb screws, which I don't see...I'm burning hardwood pellets, probably gone through 1/2 ton or less so far. Finally any advise on settings? I have the stove on thermostats mostly because it's in our kitchen and it gets hot in there. I wasn't sure if that's a problem since the stove turns off a lot and runs low much of the time. Thanks for any help!