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Standards, Heat Storage

India: New Five-Year Guarantee on Solar Tanks

Submitted by Baerbel Epp on December 2, 2013

Many Indian regions suffer from bad water quality: More than 75% of the country has moderately hard to very hard water. Chloride levels are also high in specific areas when water is obtained from boreholes. The “desired” legal chloride limit for drinking water is 0.25 g/litre, but is allowed to increase to 1 g /litre. As a result, solar thermal storage tanks gradually corrode and tend to develop leaks. Statistics obtained from the national Helpline show that over 70% of product-related complaints are about leakages in storage tanks. The photo shows a corroded extremely scaled hot water tank.
Photo: Jaideep Malaviya

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