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"  Long, hot showers are energy dumps. Homeowners can recycle some of the energy with a drain-water heat recovery system. Cold water runs through a copper pipe that spirals tightly around the vertical drainpipe, picking up heat from the used shower water. The prewarmed water then flows into the home&amp;#039;s hot-water tank. The units, which come preassembled, replace a 3- to 5-ft. section of drain-pipe. Prices range from $300 to $500.  Your Water Heating Energy Footprint   * Top 5 Water Heater Energy Saving Tips * How to Mine Heat From Your Drain * How to Insulate Your Hot Water Heater  "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.popularmechanics.com/home/how-to/a1669/4217066/>