Rocket Mass Heater Manufacturer
Here’s some links to provide more information about thermal masses and rocket mass heaters.
Rocket Mass Heater Pictures on Pinterest
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