These are the big guns I'm feeding the King,today and tonite. Wind chills will be well below zero,osage orange 3 years young,black locust 10+,I threw 2 splits on a raked forward coal bed ,and my temp shot up to well check it out in minutes. I'll tell you one thing the King is definitely at it's best when it's sub zero,and it loves the hell out of rock hard dry wood,house will not leave the 70's the next 12 hours guaranteed.PS I don't use the blower,only for a quick warmup.