Firespeaking on Instagram: "The Hybrid Cookstove Masonry Heater takes the best of Rocket Mass Heater-style combustion and combines it with technically designed thermal batteries and radiating surfaces including ovens and cooktops. The device can also be used for heating domestic hot water in a regular gas- or electric- heated water heater/tank if plumbed properly. See our website for more details. @firespeaking #nobtuleftbehind @mhanorthamerica @chris4acre @black_oak_timber"