Cold water diverters
A cold water diverter is a mechanical valve installed on a hot water line. It redirects the initial cold water, known as redwater, that sits in the pipe before hot water arrives. Instead of wasting this water down the drain, the diverter sends it to a greywater tank, a garden irrigation system, or back into the hot water storage system for reuse. These diverters work using water pressure and do not require electricity.