University of California, Berkeley, 2010 - $18,400

Middle-income families in emerging markets around the world would like to have the same hot shower their counterparts in wealthier countries experience every morning. Demand for comfort technologies like water heaters is growing quickly in these markets, but the current options for water heating are either very expensive (tank heaters) or low quality (biomass burning), and all emit significant amounts of carbon. Both the upfront and ongoing energy costs of water heating technologies in, for example, Mexico, make hot water a well-guarded comfort.

The CalSolAgua (CSA) team has developed a low cost solar water heating system capable of reducing energy costs for households in developing countries while also reducing carbon dioxide emissions. CSA’s solar water heater can retail for about $100—one-fourth of the price of competing water tank heaters.