free hot water | building a solar batch water heater Published 5 years ago • 912K plays • Length 12:39 Download video MP4 Download video MP3 Similar videos 3:11 how the $50 solar water heater works and how to build it 2:04 innovative solar hot water system for a city apartment 0:19 strong solar water heater 6:34 no gas no electricity . heat 2000 liters of water every day #invention 1:28 how solar water heater works?