Now that I think of it I grew up in a century old drafty frame house without insulation that my father had retrofitted with a wood burning forced air furnace. It was in a relatively mild climate but consumed 2 cords of wood a week in the coldest weeks. Under the right conditions/equipment, I could cut, load and haul about 4 cords of maple in a day. My second floor bedroom single pane window would accumulate ice on the inside on the coldest nights.
I used chunks of wood in the gassiffier units I built. Had only a very small door for loading. Again, the metal burn chambers burned through after a relatively few firings.
The current building does have forced air gas furnaces, one for each end. When I first tried them, concluded it would cost $70 a day of propane, which is now even more expensive.
The problem with a rocket stove is that I have not figured out how to relatively simply get hot air into the existing forced air system. I also am really hesitant to run two wood burners for the building. Up until this year, I have been using a central triple horizontal wood stove with an open collector above and ducting/fans pointed at either end. Again, the problem with this was dirty burn and chimney fire. I have thought of an external boiler with heat exchangers in the forced air systems but the cost of commercially available systems has been more than I have been willing to swallow.
The video added to this thread is interesting. It looks complicated and expensive. I have not figured out where the flue exhaust is on it.
Thanks again for the response thoughts.
