Rob R. wrote:EFM 700...very rare compared to a 520, and a beautiful machine.
x2, but I'll note that this changes the answers to some of the questions asked previously/in other threads. For example, that stoker can be mounted on the front, and in any of the 3 mounting positions the bin auger can be oriented to the left or right (as you face the mounting plate) so there are 6 possible orientations for the bin auger. Also, that unit normally would have a 9" smokepipe, so a 9" thimble would be good, and the recommended chimney size is 8"x12"x30'.
To get the best performance from this unit I would strongly recommend running it with buck rather than rice. That 16" pot holds a fair amount of coal and the fire breathes much more freely with buck than with rice. With a heat exchange surface more than 50% bigger than a 520, and burning buck, that unit will not break a sweat carrying a load that would tax a 520.