The device is known as a rocket mass hot water heater and they can be made very cheap as you can see in the video. The only cost was about 50$ worth of copper pipe. The sand and clay mixture was about 50% clay/mud and 50 sand, for most of the build. Some people also call these things rocket stoves. One thing’s for sure, this primitive technology is a cheap and effective way to get off grid hot water for free. The ancient knowledge we are taking advantage of in this case is something called thermo siphoning. Some know a similar design known as a cob oven.
- How to build a Powerful Solar Powered Homemade Air Conditioner. Blows cool air for hours.This video shows the build of a Homemade Powerful ice-based air cooler that can hold large ice-blocks (up to 50lbs) and blows cool air for hours.This can be powered by 12v solar panel, 12v battery or wall current (w/ 12v ac/dc transformer).This is made using a plastic tote, 2 lighted 80mm 12v computer case fans (blue-lit/but choose your color) and 3 pvc couplers (1.5" threaded).Tote is from walmart, fans from fry's electronics/amazon and pvc couplers from home depot/lowes. When fully loaded w/ice it significantly cools an area of 8x10 to 10x10 for several hours.The fans can be easily removed/or exchanged, (any 80mm fan works so you can run different colored ones, unlighted ones, ones of different speeds etc...anytime you want)
- DIY Video:How to build a Simple Battery Backup Power Station for Off Grid Living
- DIY Video : How to build a Homemade Chainsaw Mill from Scratch. Step by step Build Instructions