A steam injection pipe system within a cased wellbore is processed to reduce the emissivity of an outwardly facing surface. The pipe system is combined with: (1) a cleaning device or process for maintaining the low emissivity surface; and (2) a mixed fluid non-condensable gas supply to exclude steam from an annular space. This achieves a low cost and low thermal loss steam injection system. The pipe is composed of stainless steel and is polished to reduce the emissivity. The pipe is assembled and run into a cased wellbore. The polished surface of the pipe sections is solvent washed and surrounded by a non-condensable gas within the casing/pipe annulus. The non-condensable gas is introduced at the periphery of the injection pipe, mixed with the steam, and separated down-hole to fill the annulus. The cleaned low emissivity surface and mixed feed fluid gas supply achieves a significant reduction in heat loss without costly pipe insulation when compared to bare pipe injection.