This is a brilliant DIY hack for creating an off-grid water heater with just a simple handmade rocket stove, water barrel, and copper pipes! No pump! No propane!
The Hot Ash rocket stove is designed with primary and secondary burns so they burn hot and efficient. Boil a cup of water with just a handful of sticks, wood pellets, or most other biofuels.
“This is the final design of the rocket mass heater for the aquaponic geodesic dome greenhouse. It goes a bit above-and-beyond what the typical heater does!” YouTube
“In the aftermath of a disaster, purifying drinking water may be a priority. The quickest, safest method could be boiling. This biomass stove only requires four concrete blocks, a tin can with both ends cut out and a gas stove eyelet top. The completed stove is sturdy enough to hold a several-gallon container of water, stew or a heavy cast iron Dutch oven.”
Permies.com explains how rocket mass heaters can greatly reduce consumption of firewood.
“The SilverFire® Mini Mongolian Dragon is a natural draft single burner chimney stove. This stove is heavy, with a refractory ceramic combustion chamber, to provide mass for radiant heat in addition to cooking in a small footprint. Cost: $380”