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Paul continues his talk with Justin on the subject of his Walker stove to be.

Matt’s original designs call for white insulated fire bricks that are better than normal fire bricks, but as Paul found from the projects that used them, still not great.  Matt seems to use insulated fibreboard in his builds, and has a third party selling them on his site, but are a lot more expensive and Paul was recently somewhat disappointed by that material as well.

Justin and his muisses have some concern about how far the heat will reach on only occasional firings, seeing as the planned installation is on the far side of the house from where they often are.  Paul dismisses these fears, as the RMH in the fisher price house delivers convective heat to his office a good 12-15 feet away with an ajar door in the way, just no radiant heat.  As for fuel consumption, last winter he used 0.6 chords of wood, or a 4 foot cubic box filled to heaping with wood.  For context, Paul’s house has three bedrooms and has questionable insulation with the winter being about standard for Montana.  Justin’s 3.1 acres of land should be enough to supply them with enough dead trees, fallen branches, and other minor prunings to keep up with annual demand without cutting them down specially for firewood.

A brick stratification chamber can present some minor problems.  Firstly, it’s harder and slower to modify.  Secondly it not going to seal very well, although it won’t have to seal well after a few minutes of running thanks to the negative pressure.  Justin’s plans for a mosaic on the outside of the build will make that an even smaller issue due to providing a second layer of sealant.

Relevant Threads

Rocket Mass Heater forum

Walker Stoves website

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PIP Magazine - Issue 19: Ideas and Inspiration for a Positive Future
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