King County, Washington, promotes sewer heat recovery as renewable energy source

Substantial energy is used to heat water for domestic, commercial, and industrial purposes, and much of that energy literally goes down the drain. After hot water enters a collection system, its heat persists, offering a renewable, carbon-free source of thermal energy that has been harnessed only rarely in North America. Looking to promote the adoption of sustainable energy sources, King County, Washington — home to the city of Seattle — is conducting a pilot program to work with property owners and developers who want to recover unused waste heat in the county’s sewer system. At press time, the county

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