Stove is drafting great, however my thermal mass is not soaking up heat correctly.
1.) Its taking about 8 hrs to penerrate about 4in of cob and broken concrete mix.
2.) A thermometer read 148 degrees exit temperature yesterday,
My duct is 20 feet 10 from core to tee 3 feet accross and and 10 feet going back toward the core. I have an 8" system no smoke. 20 foot stack outside to compensate for my tall house. My mix was in most cases 2 clay and 1 sand to fill, and 1 to 1 everywhere else. Could it be too heavy with clay? For duct, i used sch 40 carbon for two feet, then 8 in stainless steel thin stove pipe, then spiral duct for the last 5 feet. Gave as much info as I can think, thanks.