Gas-fired water heater with combustion-aid supply system
 A gas-fired water heater includes an oxygen supply system provided with the water heater system having an oxygen supply synchronizer installed juxtapositionally to the water heater, which is synchronously opened for supplying oxygen to a gas burner, into which the gas is discharged from a gas valve of the water heater upon an opening of a water valve for supplying water to be heated by the heater, thereby causing a complete combustion of the gas for preventing a production of poisonous carbon monoxide gas. 
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Che-Yuan
Chang