berg wrote:I need a bituminous stoker fed unit and would like some suggestions.
No one that I am aware of is making coal furnaces designed for burning traditional stoker/slack coal for small residential applications. There are larger coal furnace/boilers (400,000Btu+) being produced but these would be much too big and expensive for a typical house. I believe they are all Canadian companies making these furnaces....here is a link for one
Stokermatic furnaces designed for primary heating for the typical sized home were manufactured until quite recently and I do see some of these used "later" models come up for sale from time to time but they are similar in operation to the Combustioneer furnaces you mentioned in this thread and in your old post from 2006.
I know of coal furnaces by the name of Prill that are somewhat common in north central USA which operate differently than traditional clinkering stokers you seem to be familiar with. They have a ring that rotates at the top perimeter of the retort bowl which is clever in design because as the stoker is running, this ring moves causing forming clinkers and ash to fall into an ashpit below where they can be easily removed. This means you don't have to remove clinkers on a routine schedule like you would with a stoker that simply has refractory surrounding the retort/tuyeres.
The "coalman" boiler in the link I posted above uses the rotating head type underfeed stoker.
Where are you located?