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maximum height for Rocket Mass Heater riser?

 
steward
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Location: woodland, washington
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my impression is that, generally speaking, a taller riser is better. but I imagine there's a point at which this is no longer true.

so, supposing the riser is well insulated, at what point does making it taller stop increasing performance?
 
                            
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sounds like an experiment waiting to be done by you . I can't remember if it was on this site or another but 3:1 (rise over run) was better than 2:1 and 2.5:1, so I guess your starting point can be from there.
 
tel jetson
steward
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current project is close to 4:1. seems to be working well, but I didn't try any other arrangements. that probably doesn't add much to the stove discussion, but it's one data point anyway.

unfortunately, I don't have a lot of material around for experimenting. or time. maybe someday.
 
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