Rob R. wrote:
Just because a certain coal source has a lower ash by weight figure than another doesn't mean you will have to empty the ash tub less frequently. Some coal produces ash that is fluffy and fills the tubs quickly...but they will be easier to carry.
Edit: I suppose this is might be harder to observe in hand-fired equipment since the ashes are usually ground to a powder...but in a stoker it can be very easy to see. Probably the biggest difference I observed when running a hand-fed was how easy the stove shook down when burning coal that produced fluffy white ash.
Up until this year, for me to get three days of ash in the 6 gallon bucket, I often had to shake the bucket to compact the ash. Shaking the bucket is not needed this year because even four days of ash doesn't quite reach the top.
So, not only is the weight less, the volume is less too.
Think I'll call my coal dealer and see if he bought from a different breaker this year.