ALEXANDRIA, Va., March 31 -- United States Patent no. 12,590,712, issued on March 31.
"Hot water recirculation system" was invented by Roger Kaufman (McLean, Va.).
According to the abstract* released by the U.S. Patent & Trademark Office: "A hot water recirculation system for a house or other building causes water to be recirculated to a water heater for reheating until the water is above a set-point temperature at which time the heated water is made available for use at a faucet or other hot water plumbing fixture. Recirculation of hot water takes place only when there is demand for hot water at a hot water plumbing fixture. A flow switching module for use in the hot water recirculation system can selectively direct water supplied to the...