He used 66 beer bottles. The bottles are connected to each other so that water flows through them.
Sunlight heats the water when it passes slowly through the bottles before flowing into the bathroom as hot water.
Ma says that it needs enough hot water for all three members of his family to have a shower every day.
“I invented this for my mother. I wanted her to shower comfortably,” says Ma Yanjun, of Qiqiao village, Shaanxi province.
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