So we built a rocket stove hot water heater out of mud and clay. Some would call it a cob oven, others a rocket mass hot water heater, but whatever you call it, this thing works and boy does it work well. We are getting tons of free hot water and it's staying hot! Here is an update after using it for 2 days. It took 3 days to build this. Make sure to check out our previous video if you want to learn how to make this. https://www.youtube.com/watch?v=EUnQVIlAn6M UPDATE: We added an offgrid shower to setup! See it here: https://www.youtube.com/watch?v=sUQ98wsZ12M Subscribe to learn more tips for living offgrid: https://www.youtube.com/channel/UCwu8DBvXvO6oeGLorXRg8_w #rocketmass #hotwater #heater