Burning COAL now for heat....have extra if you need (for bad children)

[Riddler]

this is the absolute cheapest heat source (unless you own/ have access to free,  big acres of trees.....cut/split/stack everything yourself)
I'm DONE w/ the outdoor wood boiler thing
Indoor coal boiler is the answer....
I can send you a small bag of coal, if you have rotten children that need santa's wrath.