Patent ID: 9612037
Date: 2017-04-04
CPC Classifications: F24H

Claim:
1. A water heater system, comprising: a tank configured to contain water to be heated; an anode rod positioned within said tank; a gas heater configured to heat water contained in the tank; one or more temperature sensing devices configured to sense a temperature of water contained in the tank; a gas control valve configured to control gas flow to said gas heater; one or more control devices configured to provide one or more setpoint instructions; a gas control board configured to control said gas control valve based at least in part on one or more signals from the one or more temperature sensing devices and one or more setpoint instructions from the one or more control devices; a first power supply configured to receive AC power from a utility line; and a second power supply configured to receive power from galvanic corrosion of said anode rod, wherein said first power supply provides power for said gas control board when AC power is available and said second power supply provides power for said gas control board when AC power is not available; and wherein said gas control board is configured to control said gas control valve independently of whether power for said gas control board is supplied from said first power supply or said second power supply.