As I was watching the video a thought came to my mind. Could on do this but instead use the methods of a blast furnace where you keep feeding air into the fuel to make it burn hotter, except in this case all the heat would be absorbed by the water.
The reason that this heats up the water so fast is how much surface area is touching the water I do believe, also at play is how much volume of air is in the main chamber. What totally baffles me is why does this stove does not smoke more than it does as shown on the video.
Yes boiling maple syrup with this would take far less wood if it is as effective as what he shows, consider how little wood he used to raise that much water up to as high as he did.