Film boiling heat-transfer coefficients, beyond “burnout,” of 800–2000 Btu/hr ft2 deg F, were measured with steam-water mixtures in annular flow at pressures of 800, 1100, and 1400 psi with healer temperatures not exceeding 1000 deg F. Variation of co-efficients with pressure, mass velocity, and steam quality are presented together with a correlation in the range of parameters studied.