Ask any six-year-old in a Chinese street, 'What's a solar water heater and what's it for?' Without hesitation they will tell you: 'A solar water heater is on the roof of a building to make hot water for the shower'. This story is told by Hongzhi Cheng, vice secretary-general of the Beijing-based Chinese Solar Thermal Industry Federation (CSTIF) and head of The Sun's Vision, a company based in the city of Dezhou in Shandong province.