Rocket mass heater ideas wanted

Hey Permies,
I've been racking my brain on how to incorporate a rocket mass heater into my home reno. Sharing photos of my current system which is an old leaky woodstove nestled into a cob lined brick nook which is inside and outside in my greenhouse. I would like to find a way to better use the thermal mass of the brick as it's not really doing the job I had hoped. I actually have not used the woodstove much the past couple of years because it gets the house too hot and leaks smoke. However I am planning to build a mudroom/apothecary/ solarium/ smaller greenhouse where the large greenhouse is now and wonder if anyone has some ideas to share on how I could make the most of this space, mass and heat for the larger area.
Wondering about filling in the space between the woodstove and cob to better transfer the heat to the thermal mass. Also thinking about adding the heat exchange drum on the other side (what is currently outside but will later be inside) to radiate more heat on that side of the wall.

I like the copper pipe for hot water and am doing further research on how I could transfer some of that heat to warm the greenhouse. I'm in the pacific northwest (aka south west - Canada side).

Oh yeah- also need a better staircase lol.

thank you revolutionaries.

That looks like a perfect spot for a Liberator:

https://permies.com/t/237541/Liberator-stove-installed-home-working

https://permies.com/t/271007/Liberator-Rocket-Heater

https://permies.com/t/270973/Liberator-rocket-heater-tied-horizontal

Anne, the Liberator suggestion is interesting. I hadn’t heard of that setup before, but it does seem like it could make better use of the existing mass compared to a typical woodstove. If Erinanne is already dealing with excess heat and smoke leaks, a more controlled rocket-style system might help with efficiency and cleaner burn. The links you shared should give them a good starting point to see how others have integrated it into similar spaces.

the liberator looks interesting but before giving up and buying something new, I am hoping I can use this stove. I would seal the leaks by adding some insulation around the stove and then cover with cob and thermal mass to join to the encircling wall (leave space under the stove but encase everything else. I could leave the top open as it is removeable and could help with cleaning and heating kettles. The side exit pipe would them lead to the heat riser which would then lead to a cob bench thermal mass.

Hey Erinanne,
you want to turn your old wood stove into a rocket mass heater?
I’m sorry, but I don’t see a lot of good that can come from that. The stove was not designed for complete combustion, so you will have creosote problems if you cook your exhaust gas down too much.
Also “upgrading” it with mass or cob is not that easy.
There are cheap and easy ways to build reliable rockets. There’s a lot of resources and people willing to help here on permies in case you decide you want to build one.