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An L-shaped heated bench, using the rocket mass heater clean-burning
and super-efficient wood burning technology. The '6' refers to diameter
of heat-exchange ducting. This design provided the sole heat for an older
Portland cottage/apartment of about 800 sf. Over 4 years, it used less than
half a cord of salvaged wood per year (local arbor trimmings and building
debris). The residents ran the fire 2 to 4 hours in ordinary cool, rainy weather, and
up to 6-8 hours when the weather dropped below 20 F, for constant 24-hour
warmth. In summer, the earthen bench was not heated, and instead helped
keep the house cooler than it had been in previous years with no need for
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6 Inch Rocket Mass Heater Plans - Annex Variation
Here is a rocket mass heater built according to the 6 inch annex variation design plans.