To ensure quality and performance of the systems, the Indian National Standards on solar flat plate collectors and solar cookers have been brought out by the Bureau of Indian Standards (BIS). Revised standards on solar water heating collectors and for solar cookers have been published.

BIS approval (ISI mark) is compulsory for any solar water heating system to be installed under projects seeking soft loan from the commercial banks or IREDA.

Apart from the Solar Energy Centre, six Regional Test Centres established by MNES in different parts of the country, test solar collectors and cookers and provide technical backup services. These Centres also act as technical back-up units under the solar thermal energy programme, besides conducting a number of training programmes. There are about 50 BIS-approved manufacturers at present with a production capacity of more than 100,000 sq m collectors per year. The annual sale of solar collectors is estimated at around 50,000 sq m. Export of solar collectors and systems has also commenced.