A team of four students and a professor of the School of Engineering of Kathmandu University is working to improve the efficiency of existing solar thermal collector (STC) technology using selective coating of Nano-particles for water heating applications. In order to address the low efficiency and the limited longevity of Nepal made solar thermal collector (STC) technology, they have designed and developed a selective coating based STC manufacturing technology. They have devised and investigated the dependence of the optical and thermal properties of black nickel based solar thermal collectors (STCs) deposited on copper (Cu) substrates. The Ni coated STC products were used to develop a prototype solar water heating system. Its performance was compared with a commercial Solar Water Heating System (SWHS) made of black paint. They have observed that SWHS with Ni selective coating results in an approximate increase of 15% in water temperature than that of commercial SWHSs with black paint based STCs. They are now developing a bigger sample of the product.