3,000 liters of hot water a day: Tinkerer needs no electricity, oil or gas
Imagine producing 3,000 liters of hot water a day without electricity, oil or gas—this tinkerer built a reliable solar thermal system using evacuated-tube collectors, insulated storage and clever thermosiphon plumbing to run entirely on sunlight and simple physics. The DIY design prioritizes redundancy and passive circulation so a small community gets steady hot water with minimal maintenance.









