Solar Water Heating


Solar water heaters ( SWH) use the sun’s energy to heat either water or a heat-transfer fluid in collectors, which are normally mounted on a south facing roof. The collected heat is used to preheat incoming water to your existing water heater. SWH systems are therefore different from photovoltaic systems that convert the sun’s energy into electricity. SWHs are made up of collectors, storage tanks, and depending on the system, electric pumps. Solar water heating systems reduce greenhouse gas emissions and conserve fossil fuel resources, while cutting energy use and saving money on utility bills. Systems can offset up to 75% of the natural gas, electricity or propane used by your current water heater.

Systems Addressed: Renewable

NOTE: The Solar Water Heating Pilot Program, exclusively for SDG&E customers, stops taking applications on Dec. 31, 2009.

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“As individuals, the change can be as simple as replacing traditional light bulbs with efficient fluorescents. In our communities we should require that new buildings include lights that turn off when people leave the room. We should follow the lead of Tokyo and their energy efficient escalators that shut off when they aren't being used. There are literally thousands of things to be done, too few of which we are being asked to do.”

-- U.S. Senator John Kerry (D-Mass.)