ALEXANDRIA, Va., March 31 -- United States Patent no. 12,590,709, issued on March 31.
"Multi-tank storage type gas water heater" was invented by Stanley Ray Widows (Cicero, Ind.).
According to the abstract* released by the U.S. Patent & Trademark Office: "A storage type gas water heater has two or more tanks/areas providing a primary heated water storage area from which hot water is drawn, and one or more supplementary water storage areas utilizing hot combustion gas from the primary heated water storage area generating and supplying temperate water to previous supplementary water storage areas and/or the primary water storage area. An energy recovery chamber is situated between the primary heated water storage water area and the suppleme...