Heat transfer characteristics of an impinging air jet are experimentally investigated under a fixed pumping power condition.The effects of dimensionless pumping power on the nusselt number are considered. The focus is on cases where the nozzle to plate spacing is equal to or less than one nozzle diameter. The results show that the nusselt number is independent of the nozzle to plate spacing under fixed pumping power conditions, while the nusselt number increases with decreasing the nozzle to plate spacing under fixed flow rate conditions. Based on the experimental result, new correlations for the stagnation and average nusselt number of the impinging jet are developed as a function of the pumping power alone.