Water heater system and method of operating same

Abstract

There is described a water heater system having: first and second water tanks in fluid communication with a cold water line and a hot water line; a cold water valve in fluid communication between the cold water line and the first water tank; a water heating circuit having a water heater, a first inlet conduit fluidly connecting the first water tank to the water heater, and a first outlet conduit fluidly connecting the water heater to the first water tank; and a controller communicatively coupled to the water heater and the cold water valve, the controller configured for: when the first water tank is fully filled with water from the cold water line, operating the first water tank in a heat charging mode including: while the cold water valve remains closed, circulating said water across the water heating circuit, said circulating including heating the water up to a temperature threshold.

Dependencies are inferred from the claim text.