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Heat Risers...

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Hi All,

Just finished reading Ianto Evans' & Leslie Jackson's book on rocket mass heaters and one question came up about the heat risers.
There's instructions on how to build a brick RMH including a brick riser and says that it must be insulated but doesn't say why...
So, why does a brick riser need to be insulated (I would have thought that the bricks themselves would be sufficient)?
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The bricks are not insulative enough. You need HIGH temps in the riser to get the clean burn/re-burn. You also need a large temperature difference between the riser and barrel to "pump" the exhaust through the heat exchanger/bench.
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