A gas blender with source pressure auxiliary mixed gas outlet for mixing a primary gas, at a primary gas source pressure, and a secondary gas, at a secondary gas source pressure, in a controlled manner to produce a mixed gas having a predetermined mixture setpoint and a predetermined control setpoint, and providing a mixed gas source having a pressure of at least fifty percent of the first gas source pressure for selective use by at least one auxiliary piece of equipment, comprising: a primary gas inlet passageway having a primary gas inlet port, for receiving the primary gas from an external source, and a primary gas inlet passageway discharge; a secondary gas inlet passageway having a secondary gas inlet port, for receiving the secondary gas from an external source, and a secondary gas inlet passageway discharge; a gas mixing apparatus in fluid communication with the primary gas inlet passageway, the secondary gas inlet passageway, and a mixed gas distribution passageway, wherein the gas mixing apparatus receives primary gas through the primary gas inlet passageway and receives secondary gas through the secondary gas inlet passageway, wherein the gas mixing apparatus mixes the primary gas with the secondary gas in response to a mixing control signal thereby producing the mixed gas at the predetermined mixture setpoint and a pressure of at least fifty percent of the primary gas source pressure that then exits the gas mixing apparatus via the mixed gas distribution passageway, wherein the mixed gas distribution passageway has an auxiliary mixed gas outlet for supplying the mixed gas at the predetermined mixture setpoint and a pressure of at least fifty percent of the primary gas source pressure for use by the auxiliary piece of equipment; a gas sensor in fluid communication with the mixed gas distribution passageway for producing a gas signal; a mixed gas delivery control valve in fluid communication with the mixed gas distribution passageway and a mixed gas controlled passageway, wherein the mixed gas delivery control valve receives the mixed gas at the predetermined mixture setpoint and modulates in response to a delivery control signal thereby fixing the mixed gas at the predetermined mixture setpoint and the predetermined control setpoint that then exits the mixed gas delivery control valve via the mixed gas controlled passageway at a mixed gas controlled passageway discharge separate from the auxiliary mixed gas outlet; a delivery sensor in fluid communication with the mixed gas after it exits the mixed gas delivery control valve for generating a delivery sensing signal; and a controller for comparing the predetermined mixture setpoint and the gas signal, and generating the mixing control signal, and for comparing the predetermined control setpoint and the delivery sensing signal, and generating the delivery control signal. a primary gas inlet passageway having a primary gas inlet port, for receiving the primary gas from an external source, and a primary gas inlet passageway discharge; a secondary gas inlet passageway having a secondary gas inlet port, for receiving the secondary gas from an external source, and a secondary gas inlet passageway discharge; a gas mixing apparatus in fluid communication with the primary gas inlet passageway, the secondary gas inlet passageway, and a mixed gas distribution passageway, wherein the gas mixing apparatus receives primary gas through the primary gas inlet passageway and receives secondary gas through the secondary gas inlet passageway, wherein the gas mixing apparatus mixes the primary gas with the secondary gas in response to a mixing control signal thereby producing the mixed gas at the predetermined mixture setpoint and a pressure of at least fifty percent of the primary gas source pressure that then exits the gas mixing apparatus via the mixed gas distribution passageway, wherein the mixed gas distribution passageway has an auxiliary mixed gas outlet for supplying the mixed gas at the predetermined mixture setpoint and a pressure of at least fifty percent of the primary gas source pressure for use by the auxiliary piece of equipment; a gas sensor in fluid communication with the mixed gas distribution passageway for producing a gas signal; a mixed gas delivery control valve in fluid communication with the mixed gas distribution passageway and a mixed gas controlled passageway, wherein the mixed gas delivery control valve receives the mixed gas at the predetermined mixture setpoint and modulates in response to a delivery control signal thereby fixing the mixed gas at the predetermined mixture setpoint and the predetermined control setpoint that then exits the mixed gas delivery control valve via the mixed gas controlled passageway at a mixed gas controlled passageway discharge separate from the auxiliary mixed gas outlet; a delivery sensor in fluid communication with the mixed gas after it exits the mixed gas delivery control valve for generating a delivery sensing signal; and a controller for comparing the predetermined mixture setpoint and the gas signal, and generating the mixing control signal, and for comparing the predetermined control setpoint and the delivery sensing signal, and generating the delivery control signal.