Additionally, the Calderon residence installed a small 25 gallon electric water heater for the rare occasion when backup heating is required. And in the summer months they always disconnect the backup water heater, since the Heliodyne system provides ample hot water for the whole family. EXCELLENCE BY DESIGN ® ® CASE STUDY: CALDERON 25-YEAR-OLD SYSTEM Overview Back in 1984, Paul Calderon of Castro Valley, California, decided to install a sola

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