Abstract: A gas delivery system for an appliance, such as a water heater, including a gas control valve and a blower housing assembly which are mounted to the water heater proximate one another. The blower housing assembly includes a motor for driving an impeller within the blower housing, and an outlet of the blower housing is connected to the gas burner assembly of the water heater. A gas supply conduit extends from the control valve into the blower housing, and the outlet of the gas supply conduit is disposed within the blower housing interior near the blower housing inlet and the central portion of the impeller. In operation, rotation of the impeller draws a flow of air through the blower housing. Concurrently, gas is supplied through the gas supply conduit to the interior of the blower housing near the impeller, and the gas is mixed with the flow of air to form an air/gas mixture which is supplied through the outlet of the blower housing to the gas burner for combustion.