Hi everyone. I just got my harman xxx installed on Dec 20th 2013. The installer told me to run it at a feed rate of 1 and a half to 2. After trying this for a few days I was disappointed with the heat it was producing and found this sight and read the post about harman. Thank you guys for sharing the info. This is my first pellet stove, all I've ever had before is an oil furnace so it's all new to me. Now I have it set at a feed rate of 4, my first question is should I be concerned about the size of the flame, it goes almost to the top of the chamber. Btw so far I love it.