Solar Hot Water Systems
Solar water heating systems usually save owners 50-80% off their
water heating bills. The sun provides free energy that won't be subject
to a rate increase!
How Solar Water Heating Systems Work
Solar water heating systems use south-facing solar collectors to
capture solar energy in the form of heat which is transferred to water
or a high heat transfer fluid such as propylene glycol.
The
solar collectors can be arrays of evacuated tubes or flat panels, and
can be installed on roofs, accessory buildings, or free standing mounts.
Active systems use circulating pumps (which may also be solar-powered)
to produce hot water up to 195 degrees F. Active systems can produce
more hot water per day than passive systems. Passive systems do not have
any pumps, controls, or moving parts. They simply use gravity and
in-line water pressure to move heated water to a storage tank.
Download the Dept. of Energy's Heat Your Water With the Sun document below to learn more, there's an excellent graphic & explanation on page 2:
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