The Ministry of New and Renewable Energy (MNRE), Government of India has joined hands with UNDP/UNEP/GEF in a project Transformation and Strengthening of Market for Solar Water Heating Systems in India. International Copper Promotion Council (India) has been participating in this project and it has sponsored the writing of this book. I am thankful to MNRE, UNDP/GEF, and ICPCI who entrusted me with this assignment.