This is the fourth day of the season for a Haas & Sohn (c.1980) "Slow-Combustion Stove".
The draft is adjusted to .05" via baro damper, and stove top is 425* on Kimmel nut size coal.
The stove handles pea size coal well and may run a tad cooler, so fueled.
This represents near max output at the automatic setting of 6 (of indicated 1-6) The stove-top temperature
is well regulated via the automatic thermostat, and has held setting from 250* to near 450*.
The hopper, readily seen through the window, is well masked by the play of translucent coral-blue flames of the higher settings, in the evening. The stove is tight and well sealed. There is an additional air setting (0-2) behind the ash door, directed toward other specific fuels and slow burning [lignite briquettes, coke & etc. (& presumable of Euro market)]
Manual setting of the output looks to enable more combustion air and greater temperature but I haven't gone that route yet.
The stove is a cast iron stove sheathed in an enameled shell. The stove is thus, essentially, "Double Walled".
Little radiant heat is thrown off and most heat rises via convection from the sides of its "shell". Radiant heat is primarily
from the window, which has a slight mirrored effect, I believe to reduce infra-red...
The weight of this stove is in the area of 380lbs; hopper hold 50+lbs; burn time from 1-3 days.
The manufacturer seems to stress the fact that it can be turned down to burn coal quite slowly,
throwing-off little heat while doing so.
Bob

