  An all-copper prototype system for collecting solar energy to heat swimming pools has celebrated over 25 years of trouble-free operation. Installed on a roof of a guest house in Pasadena, California (USA) in 1973, the solar heating system functions without problems and should last at least another 25 years or more.
The solar heating system collects enough solar energy to enable the homeowner to extend the use of their pool for an extra three months each year. Since its installation, the system is estimated to have saved the equivalent of 18,300 barrels of oil.
The system has been replicated around the world, especially in Mexico. Its design was detailed in a 46-page manual originally published by the Copper Development Association (USA). The manual, "How to Design and Build a Solar Swimming Pool Heater," is available from the American Solar Energy Society, 2400 Central Avenue, G1, Boulder, CO, USA 80301.
Competitive systems made of plastics might have failed after 10 years and are hardly likely to have lasted 25 years. |
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