So yesterday I got tired of the GT's not keeping up with the colder temps we have been having lately. I did a thorough vacuum cleaning of the Leyden and ran the hopper clean of GT's and threw in my first bag of Hamers this season. What a noticeable difference in temp when I woke up and how little ash there was. I was even able to turn the heat down to "1" today and the main floor still maintained a 70 degree temp. Nice to know that the extra money I spent for these 'Ultra-Premium' pellets was worth the money. I don't do any fancy testing, but I know that I was cleaning the fire box of ash morning and night with the GT's and haven't had to clean it yet with the Hamers (tomorrow).