In this paper, the effects of inlet turbulence level on the development of three-dimensional turbulent flow and heat transfer in the entrance region of a helically coiled pipe are investigated by means of a fully elliptic numerical study. The k-epsilon Standard two-equation turbulence model is used to simulate turbulent flow and heat transfer, which are assumed to develop from the inlet to the outlet simultaneously. Constant wall temperature and uniform inlet conditions are applied. The governing equations are solved by a Control-Volume Finite Element Method with an unstructured nonuniform grid system. Numerical results presented in this paper cover a Reynolds number range of 10(4)-10(5), a Prandtl number range of 0.02-100, and an inlet turbulence intensity range of 2-40%. The development of the main velocity field, the secondary velocity field, the temperature field, bulk turbulent kinetic energy, the average friction factor, and average Nusselt numbers are discussed. It is found that bulk turbulent kinetic energy far from the entrance is not affected by the inlet turbulence level. Significant effects of the inlet turbulence level on the development of the friction factor and Nusselt number occur within a short axial distance from the entrance only.