richsoil.com/heat Paul, ernie and erica estimate that there are about 200,000 to 300,000 rocket mass heaters currently being used world wide.Why aren't there millions of them? It comes down to effort and a certain level of DIY ability and ingenuity.
What can be done to make this far easier?
In 2012 they debated methods of developing a shippable core (the most difficult part of the build). Their hope was that somebody would build a business, building rocket mass heater cores and then make them widely available for people to purchase.
In October of 2012 they had a design, a functioning core and a method for packing and shipping the cores as well as estimates on shipping costs. Using this core the built a rocket mass heater in forty-five minutes.
In 2013 they hosted a workshop and offered to teach a course on shippable cores. The wood-box style rocket mass heater was born of this event. Erica focused on design where high temperature refractory cement could be poured into a mold and Ernie considered a design where money was no object. They were able to use all of this knowledge to find better, faster and less expensive ways of creatinga functional rocket mass heater.
Erica's build used Ciment Fondu, a high-temperature, refractory cement which can be poured into a mold to create a core. With some trial and refinery, Erica was able to pour a core complete with a manifold. In this design there is no need for a gasket, as the ash will eventually seal all the tiny gaps. Unfortunately the core didn't last very long and the pourable cores project had to be set on the back burner.
Matt Walker arrived in 2014 and showed the folks how he builds a pourable core using sparlite 60. It looks like a vary durable core, with no signs of cracking after 2 years of use.
Wood box style designs have gone through many iterations as well. Paul shows us some of those improvements. The resulting core has been in use for 2 winters already still looks like it's functioning well.
Ceramic Fiber Cores: In 2012 the first one was built. It's highly insulative and the material can be molded into the proper shape. For roughly seven-hundred dollars the team was able to get this stove up and running. It was the best burning stove of the bunch and it had the shortest build time of all as well.
More about rocket mass heaters in our DVD set at
richsoil.com/wood-heat.jsp
0:00 there are over 200,000 Rocket Mass Heaters in the world
1:25 different designs of shippable cores for rocket mass heaters
2:04 pourable core design
4:35 Matt's core design
7:00 ceramic fiber cores
Thanks to Dan Ohmann of The Grass-fed Homestead channel for helping me with the editing:
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Relevant stuff at permies:
permies.com/t/31100/Rocket-Ma...
permies.com/wiki/63837/Wood-H...
permies.com/f/260/rocket-mass...
permies.com/wiki/63312/Rocket...
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Better Wood Heat: DIY Rocket Mass Heaters 4-DVD set
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Rocket Mass Heater Workshop Jamboree
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