Rocket Mass Heater Plans: Annex 6" L-shaped Bench by Ernie and Erica

Hi folks!  We lived with this lovely heater for 4 years and can personally recommend the design!

To purchase the plans, please click your choice of payment below.
Once you have made your purchase with pie or Paypal, you will find a link at the bottom of this post. Click to download, and that's it!







This project also has been featured in a lot of free, online articles:
The fun we had working our way through the permitting process in Portland, Oregon, article on our website HERE

Free video that includes process photos from building this heater (one hour video presentation, we show the Annex 6" building process from 40:00 to the end).



If you already got these plans from us, and have built a rocket mass heater using these plans, we'd love to see your photos and project stories here too!  

Thanks,
Erica W

Full description:

Annex 6" Heater Plans

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, we used less than half a cord of salvaged wood per year (local arbor trimmings and building debris). We 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 fans.

The document prints letter format 8.5" by 11, or 11" by 17", six pages including photos; scale drawings of the floor plan, elevation, and sections; a cutaway view; and builder's notes on the construction process.

These are as-built drawings for information only; no guarantees or licenses implied. References to ASTM standards and building codes are included to help prospective builders research local building requirements.