
Heat your home with 80% less wood while eliminating smoke, ash, and constant fire-tending. Complete construction manual for building ultra-efficient rocket mass heaters that provide superior comfort, slash heating costs, and burn so cleanly they're legal in smoke-restricted areas.
Why Rocket Mass Heaters Outperform Traditional Wood Stoves:
Conventional wood stoves waste 60-80% of fuel energy up the chimney. Rocket mass heaters capture and store that energy in thermal mass, providing 6-12 hours of radiant heat from a single 1-2 hour burn.
What You'll Build:
Proven Performance:
Builders report heating 1,500-3,000 sq ft homes with just 1-2 cords of wood annually (vs 6-8 cords for conventional stoves), eliminating daily fire maintenance, and achieving payback within 2-3 heating seasons.
Transform heating from daily chore to set-and-forget comfort. Build the last heating system you'll ever need.
Erica Wisner is a skilled educator and project coordinator, with over 25 years' experience building teamwork and facilitating hands-on learning. She loves making things from scratch: anything from blueberry scones to the oven they were baked in. Erica is the author of The Ultimate Girls' Guide to Science and The Art of Fire. Together with her husband Ernie, she has built over 700 super-efficient, clean-burning masonry stoves and led over 50 workshops across North America.
Ernie Wisner is a jack of all trades - his rich and varied background includes fishing and maritime work, firefighting, botany, natural building, hydraulics, and plumbing maintenance. Ernie's search for sustainable solutions led him to Cob Cottage Company, where he built his first rocket mass heaters Rocket Mass Heaters. Together with his wife Erica, he has built over 700 super-efficient, clean-burning masonry stoves and led over 50 workshops across North America.
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