Jean-Francois Gallant

I currently only have 17 cinder block. Not the big one , size is 8inch x 16inc x 6inch.
It's weight 13Kg each ( 28.5lbs ).

So I have about 0.25tons of concrete. More than what I expected.
If I fill holes with concrete ( denser than sand : 2600kg/m3 vs 1600kg/m3 ), I can get extra weight and go up to 0.55tons total.

I check for this kind of mod too , because my pipe get really hot all it's length ( so a lot of heat go outside ):

Wow ! Thanks for all the interest about my topic. I never thinking about getting all this answers. More active community that I expected. Thanks again !

I know I can't create more energy from my wood coord than what it's can deliver. What happens is like many steel stove , it's deliver a lot of heat really quickly and my dreams is to keep the stove burning in the evening , stop feeding it when I go bed , and get a kind of " damping effect " that absorb all that energy as possible and deliver it slowly during the night and the next day morning. For now the stove just pour all the heat in my house really fast , getting the house too hot quickly.

I know restraint air in the stove is not the best for efficiency by getting the combustion low in oxygen , creating incomplete combustion. right ? So fast combustion with all oxygen need but with a mass to deliver it slowly sound more efficient.

Another things is a hope the draft in the second setup remove more heat from the pipe before they get lost in the chimney.

All my thinking make sense ?

EDIT: Oh and yes I want to built a rocket mass heater or a double bell mass stove someday by myself. Need to talk to my house insurance for that. This forum is a good source of informations for that. My neighbour is a masonry builder , probably I can get some advice from him too. He already coach a guy for a rocket mass heater if I remember. I need to pill up a bit of money for that project.

Hi all !

I going on permies forum to read many interesting articles , mostly about stove and rocketstove but other subject sound interesting too !
After few year , I just decided to create a account I try to participate to that beautiful community.

Last year and this year I try many setup to adding a bit of mass for my steel wood stove with concrete cinder blocks.
I try the classical setup by making walls around it:


But another setup I try is by stacking over the stove with spacer ( 3/4 inch ) to let's the air enter under the blocks and rise inside the holes of the cinder blocks:





I get a good draft like you can see with the flame of my bick lighter:



What did you think about the two setup ? Not sure which one is better.
I think the one over the stove get warmer when I did a fire with the same amount of wood.