So now that i've got my Harman XXV heating my home on a daily basis, I've been trying different brands of pellets. Nautrally i've been buying low ash, hard wood pellets. However, i wonder if there is a definitive "Best" brand of pellet to butn. Meaning - gives of the best heat, burns the longest, cleanest (lowest ash?). i've been told oak is probably the "best". Does anyone out there have any other opinion or experiences with any particular type of pellets? Thank you again in advance.