Did some checks after this from Stewart Brand (Clock of the Long Now):
"In the 1970's my generation thought that solar water heaters on roofs were a good idea...We were blithky ignorant of American experience only a half century in the past, when solar water heaters routinely crashed through the newly rotted roofs in Pasadena in the 1920's"
Ah,now there's the value of "institutional memory"
Some links:
Solar History lecture
California Solar Center - Solar Thermal History
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