DIY Heating Systems
3 simple DIY “Sand Battery” Air Heaters! all w/non-electric “heat powered” fans! all 3 units run totally off-grid! the hot sand in the ‘sand battery’ heats the air AND runs the stove fans! no electricity is needed! the hot air rises off the sand and the fans blow that hot air into the living space of a room. hot sand heat storage is a new and exciting technology. sand is great for storing heat *and can store it at very high temperatures.