Asia Times has a report about the proliferation of solar water heaters in China as part of the country’s efforts to produce and promote renewable energy technologies:
Solar water heater systems can be seen across China, from the largest urban metropolitan areas to the smallest rural hamlets. The systems are most common on residential buildings in urban areas, while 90% of the systems are used in single households and 10% in schools, hotels and restaurants.
Altogether, over 30 million households in China use the systems. Southwestern Yunnan province, an area known for abundant sunshine and consistent year-round temperatures, has adopted widespread use of solar water heater systems, with almost all residential buildings in cities and rural areas equipped with them.
A combination of low production costs and significant government support has contributed to the rise of the systems. A standard household system can be set up for just over 2,000 yuan (US$294), compared with 1,800 yuan for gas and as low as 500 yuan for comparable electric water heaters. However, every cubic meter of natural gas costs about 1.7 yuan and every kilowatt hour of mains electricity costs about 0.44 yuan, compared with no cost for a SWH system – a significant savings over time, especially in areas with no access to natural gas and with abundant solar energy.
According to a study by Shanghai Jiao Tong University, SWHs were the most economical domestic hot water system compared with diesel oil boilers, gas boilers, or electric water heaters. The annual operating costs of SWHs in Shanghai were 70% less than electric water heaters.
Read more about the rise of solar power in China via Good Magazine.
