We have promoted solar domestic hot water systems for many years now as a cost effective way to save energy. There are many state and local tax credits available for these systems that help defray the cost of installation.
There is another type of system that is increasingly being used in residential and commercial buildings to lower the energy costs for water heating. Drain water heat recovery utilizes a heat exchanger to recover heat energy in waste water and pre-heats incoming cold fresh water. This type of system is relatively inexpensive - $200 to $500 - and requires little maintenance or upkeep. It can be used on its own, or in conjunction with a solar water heater.
For more information visit the U.S. Department of Energy website or www. RenewABILITY.com.
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