Inter-ELM and ELM divertor heat loads were measured on JET in dedicated deuterium, hydrogen and helium discharges. Matched triplets (D, H, He) were obtained for different values of magnetic field, plasma current and heating power. In this article, the above experiments are described and the results are presented in terms of empirical scalings of inter-ELM and ELM wetter areas versus engineering parameters. The obtained scalings are then compared with those previously reported in the literature and implications for ITER are tentatively drawn.