Two 6" RMH

Hi Permies people,

this year I built two 6" RMH according the example Annex 6". First RMH I built in my workshop at the end of winter (fig. 1) and second one (which is in kitchen) is just finished (fig. 2) and we are enjoying the heat just now  Kitchen RMH works fine and we heat all house (around 120 m2) while outside temperature is 8-10 °C. Difference between kitchen and workshop RMH is that in kitchen i cut bricks for "shell" on half (fig. 3), rest is pretty much the same. Heat goes just fine through 1/2 bricks while through whole brick in workshop barely came to the surface of the brick.
Kitchen RMH is connected with pipes to chimney which is in another room behind the RMH (fig. 4). Here i want to build one more thermal mass bench but i am little bit afraid that this will affect draft (the end of metal pipe on the fig. 4 is connected to the another pipe in wall which is about 2m long and this pipe lead through wall to the chimney). I was thinking to insert bypass and "turn on" thermal bench in another room only when hard winter come, so the draft should be enough.
Anyway big thanks to authors of the Annex 6", if RMH will continue to heat us same way as now, we will probably save costs more than 4 time

Beautiful work!

Wonderful work.Congrats.
How much would you thermal storage weigh?
Is it made of cob and stones inside the brick casing?
Also what about the dimensions of the thermal bench?

Hard to say how much thermal mass... I assume from 800 up to 900 kg if we count refractory bricks.

Inside the brick casing is clay mixed with sand 1:1. Clay is from old unbaked bricks from ruined house which my neighbor crushed down, so there was also a little bit of straw.

Here are the main dimensions in centimeters.

That's something to be admired, thanks for sharing.

The tile against the side of the wall was a really good choice.

Jarret Hynd wrote:
The tile against the side of the wall was a really good choice.

Thanks, i came up with this idea while building RMH in my workshop, i was bored of straight lines, so i decided to add little bit of curves (and to cover walls dirty from clay).