I just hooked up my new Harman xxv pellet stove yesterday,and so far so good.I ran it for the first time last night,and it did a great job heating the whole house. It's been maintaining 69*. The only thing I notice is that after dropping the pellets, once in a while you hear a slight clunk noise.This doesn't happen all the time,I was just wondering if anyone has noticed this in their stoves.