the man you watched on utube happens to be one of our close friends here at nepacrossroads (his name is William) and I'm sure he can elaborate for you as soon as he views this thread... but I can offer some basic's:
One of the main advantages of the Glenwood Baseburner is the fact that its a coal stove able to maintain a coal fire at extreme
low temps (The reason it has this ability is because it recirculates hot gases around the coalbed the way it does, this heat is REQUIRED for a coal fire! a coalbed has a definitive minimum temp. requirement to maintain itself).
I don't believe their is a reason why you would have to burn wood in a stove like this even in spring/fall. The efficiency rating of modern coal stoves cant compete with a design like this because not only is that Glenwood of the design that has long been known to be the best for coal burning (tall, cylindrical, air from bottom, etc.) but it combines this design with an incredibly thin wall combustion chamber (do to the slight space between the firebrick and barrel) able to radiate heat incredibly well, it also employs a blower that takes zero electricity (those rings are their for a reason... as heat radiates of the base and combustion chamber it rises to hit those rings which deflect it out into the living space), You can also think of it as the first convection stove as well (but the convection takes zero electricity!)... because of its tall hood area that fills with gases and burns and this air is then recirculated around the stove so all the wonderful heat from it is sucked into the living area BEFORE it ever gets near the flu and out your chimney.
No sir... It would cost a lot of money to replicate a stove like that today (easy for china to make a knock off Oak or Cannon Stove)... but not one of those Glenwood Baseburners
William can give you more info than I.... but in terms of efficiency it cant be beat by anything I know of today.