The heat transfer in a helical coil with ribs of triangular cross-section periodically mounted on the wall in the streamwise direction is examined by numerical simulations. The pitch ratio and curvature of the helical coil is fixed, while the distance of neighboring ribs is varied to investigate the effect of the mounted ribs on the flow and heat transfer. The heat transfer and friction coefficients are evaluated for various values of pitch between neighboring ribs. It turns out that the periodic ribs enhance the heat transport in the core of the helical coil.