Glenn Herbert wrote:I have a cast refractory J-tube core and perlite/clay slip riser which is quite insulative, and coals burn to ash every time. I also have a positive natural draft, so if I don't cover the feed after burning I will get constant cooling airflow. I think you may be getting too strong airflow during coaling which is stealing the heat. Wood that is not dry enough could also be an issue, though if you have the same wood you used to that becomes less likely.
Satamax Antone wrote:Laura, you might be missing some mass behind, and your draft is too strong. Maybe. Your firebox and burn tunnel still are made of bricks?
There is another thing which can do that, wet wood.
Satamax Antone wrote:The fumivore, not a rocket!
using the term Rocket on a wood stove regardless how fancy looking or professional it may be constructed dilutes the definition of our goals and our goal at permies is to be efficient, earth friendly, sustainable and you can not do all that by not burning almost all the fuel and gasses. Permies members seek efficient and environmentally built Rocket stoves. Allowing unconsumed fuel escape out the exhaust defeats those desires and goals.