Experiments were performed to study the effect of nozzle rotation, flow rate, degrees of subcooling, number of jets, and velocity on the heat flux in jet impingement cooling using deionized distilled water. The heat flux is a strong function of the flow rate and degree of subcooling, attaining a maximum value of the order of 600 W/cm at the highest flow rates. The heat flux shows no significant dependency on velocity and number of jets for fixed flow rates. The rate of rotation shows no significant effect on the heat flux within the forced convective and early nucleate boiling region. At temperatures close to the critical heat flux the rotation retards the heat flux (compared with a stationary jet) diminishing it by 20%. Comparisons with published results are presented.