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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.
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.
Well I guess I asked the question to soon. That's why its called a MASS heater. Dah!
Will you have to stay up all night to feed it when its freezing outside?
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