Here’s some links to provide more information about thermal masses and rocket mass heaters.
Rocket Mass Heater Pictures on Pinterest
If encased in a thermal mass such as brick or clay, this exhaust line will provide heat that can be stored for many hours.
Wikipedia Definition of Rocket Mass Heater
Examiner.com: Rocket Mass Heaters Use 80% Less Fuel
Ernie and Erica’s Site (Very Knowledgable People about RMH)
Super Efficient Rocket Mass Heater
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