ALEXANDRIA, Va., June 25 -- United States Patent no. 12,339,037, issued on June 24.
"Indirect water heater" was invented by Bryan D. Quinn (Morrison, Colo.).
According to the abstract* released by the U.S. Patent & Trademark Office: "An example indirect water heater is disclosed having a water storage tank with a primary heat exchanger. A heating fluid inlet of the primary heat exchanger receives a heating fluid from an external heat source into the primary heat exchanger. A heating fluid outlet of the primary heat exchanger returns the heating fluid to the external heat source after traveling through the primary heat exchanger. A secondary heat exchanger has a water source inlet and a water source outlet. The secondary heat exchanger is ...