なぜアメリカは世界最強の「天然温水器」を捨てたのか？130年の歴史に隠されたクリーンエネルギーの謎

Solar water heaters, which boast a penetration rate of over 90% in the regions with the longest hours of sunshine in the world, are actually an American-born technology, yet they have completely disappeared from rooftops in Japan. This video explores why this simple machine, which boasts four times the heat conversion efficiency of solar power generation, was abandoned by the American market twice, delving into the mysteries of drastic changes in energy prices and deeply rooted business practices hidden behind it. Please watch until the end to discover the true value of this 130-year-old passive technology that supports global infrastructure, and the dramatic history of its evolution leading to modern heat pumps.