China. They are the world’s leader in solar water heater (SWH) production and installation. They have more than 90 million square meteres of SWH panels, twice the capacity of Europe and four times the capacity of the US.
Israel began using SWH in 1950 and mandated installation in 1980. They now have 90% of homes using SWH and save themselves 1.6 billion kWh per year.
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