Patent ID: 7458520

Claim:
A water delivery system for connection to a cold water source, a hot water source and a mixed water outlet, and for providing a mixed water of a desired water temperature to the mixed water outlet, the water delivery system comprising: a cold water valve adapted to be coupled to the cold water source for receiving cold water, and having a cold water outlet; a hot water valve adapted to be coupled to the hot water source for receiving hot water, and having a hot water outlet; a fluid mixer configured to receive cold water from the cold water outlet, to receive hot water from the hot water outlet, and to provide a mixed water to the mixed water outlet; and a controller operably coupled to the cold water valve and the hot water valve, the controller being configured to adjust the cold water valve and the hot water valve to regulate a mixed water temperature of the mixed water to substantially correspond to the desired water temperature, the controller being further configured to regulate the mixed water temperature based on at least one characteristic of the cold water, at least one characteristic of the hot water, and at least one characteristic of the mixed water, wherein the controller operates alternatively in a feed forward manner and a feed back manner, the feed forward manner providing for the adjustment of the cold water valve and the hot water valve based on the at least one characteristic of the hot water and the at least one characteristic of the cold water, and the feed back manner providing for the adjustment of the cold water valve and the hot water valve based on the at least one characteristic of the mixed water, the controller operating in the feed forward manner when at least one of the cold water and the hot water is unstable.