Here’s a simple concept that makes perfect sense. Capture the wasted heat from water used in a shower or dishwasher and put it back to work. The Power-Pipe is a simple heat transfer device that uses copper as a thermal bridge. As hot graywater flows vertically down the central copper pipe (typically from a shower), copper tubes attached to the pipe carry cold water up, capturing some of the heat. That pre-heated water, the company says, should then be diverted to the home water heating system, presumably via insulated pipes. The company claims that up to 40% of a home’s water heating costs can be recouped with this gadget.
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