The Alaska model 140 is a stoker furnace.. it burns rice or maybe rice and buckwheat coal mixed. It cannot burn wood,, This is an automatic furnace,, just keep the hopper full of the right size coal,, and keep the ashpan empty.. it will run for days on a load of coal.. It would need more coal every day or two in realy cold weather..
The Alaska 140 comes in two different stoker setups.. an auger feed and flat-bed stoker.. both are well proven designs.. both are excellent know good products that have been sold and in use for decades.
From what I can find to read, the 'Energy King' is a hand feed furnace, with the need for tending every 12 hours or so, maybe more often in really cold weather. This unit is not automatic.. it will not have the even heat of a stoker, or the ease of control.. Once you have some experience with it, you would figure out what is needed to keep your temperature even, the fire lit and the unit keeping you warm. But it is a hand operation, not automatic..