Comment

Comment by Jon Nose on December 8, 2014 at 1:08pm

It is my understanding that it is the sand and rock the absorb the heat and store it ..... the clay and straw are only binding agents.

Comment by David on December 8, 2014 at 7:40am

I made the mistake of surrounding my exit pipes with sand and rock.  I discovered that sand is an insulator and the air in between the rock is an insulator.  I have removed that sand and rock and have to surround the pipe with cob so the heat can be absorbed by it.  So for now I burn for around 2-3 hours at night and then run a small buddy heater on low on cold nights.  Once the cob bench is done I shouldn't have to run the buddy heater.

Comment by George Ortiz on December 7, 2014 at 6:34pm

Well I guess I asked the question to soon. That's why its called a MASS heater. Dah!

Comment by George Ortiz on December 7, 2014 at 6:31pm

Will you have to stay up all night to feed it when its freezing outside?