Shenandoah was a popular brand of wood and coal heaters - bare bones, but very functional - which was originally made in Harrisonburg, VA.
They also made some Central Heating furnaces.
Among the models are the R65 and R77.
These heaters used a Bimetal thermostat to control the combustion air. Most models were radiant heaters, although they did make some convection models which had sheet metal cabinets around the basic units.
Some of the models are currently being made by Sierra Products:
Model R65 Wood/Coal Stove shown below