Hey Gary, did you take any photos with the doors open??? If the top door is for loading, and the bottom of the middle door is at the level of the grate, that would be a pretty deep firebox. Have you looked inside to see how close the firebrick lining gets to the loading door??
Is this a pure radiant stove or are there convection air ducts somewhere on the stove body??
Inquiring minds want to know.......