Water heat recycling
Use of a heat exchanger to recover energy and reuse heat from drain water / From Wikipedia, the free encyclopedia
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Water heat recycling (also known as drain water heat recovery, waste water heat recovery, greywater heat recovery,[citation needed] or sometimes shower water heat recovery[citation needed]) is the use of a heat exchanger to recover energy and reuse heat from drain water from various activities such as dish-washing, clothes washing and especially showers. The technology is used to reduce primary energy consumption for water heating.