I have a Harman p61a this is my 2nd year burning. Last year I used only Wood Pellet Company pellets heated my 2,100 sqft colonial no problem. I did a very thorough clean in the beginning of fall. I noticed that my pellets weren't throwing as much heat as last year. I really didn't pay too much attention to it due to the fact it has been a very warm winter in CT. Well the last 2 days have been in the 20's and the stove isn't throwing enough heat to even heat the room it's in. I went out and picked up some Hamer Hot and the same outcome. I cleaned the stove again and still not much heat. Finally after having this go on, I open the fine box there were a few pellets in there, but what I noticed is that when I cleaned it in the fall I must not have had a good seal, because when I put it back and turned the stove on now it's blaring HEAT! My wife is very happy again, and of course she says I should have done this weeks ago. I can't believe I'm saying this but if I listened to my wife weeks ago I wouldn't have been cold for the last week! Now it's time to sit back and enjoy the heat.