The one thing I remember from here .. or the book .. is that it takes one hour of heat .. to heat the first inch of cob .. does it take longer or shorter to heat the second inch?
I'm about to have a 16x24x37 metal box constructed with built in flu controls added by a sheet metal shop and will fill it with basalt rocks. It will have a removable top so I can add and subtract rocks to get a 100 degree exit temp when I'm normally firing my stove to 350. I hope to go for four to six hours during the night without having to get up and .. "
feed the fire."
If this plan gets the house too hot while charging the rocks and they cool off too fast .. I will have to play with cob outside if it gets us too hot .. or a clay fire brick liner inside. I have a Chinese Fire Jet that I could put a flue on instead of a pot and do away with my soapstone and just fire this thing directly and with less
wood. Don't think I'll do that .. would rather design my own Jet to burn scraps of 2x4 and tree wood .. get a shorter burn, more draft, much easier to "tend" or fire using the self feed of longer vertical wood instead of a horizontal constantly watched type Jet, better air flow as the fuel can not interfere with the incoming air flow of the vertical feed, it has its own air entry with its own controls. I may be able to rob the insulated vertical Chinese chimney .. it is pretty neat.
