Lenny; With an 8" system in a greenhouse , I seem to average 100-120 at the hot end and 80-90 at the far end . If I burn hot all day I see 130-140 and 90-110 . In an insulated house it would be more.
For all your Montana Masonry Heater parts (also known as) Rocket Mass heater parts.
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For my next feat, I will require a volunteer from the audience! Perhaps this tiny ad?
Experience months or even years of natural building and growing your own food