The peculiarities of heat transfer in water in the course of rapid transition from the state of compressed fluid to supercritical state along the isobar has been studied experimentally. The constant heating power mode for the technique of controlled pulse heating of a wire probe was used. The characteristic heating time was of the order of milliseconds, the characteristic heating layer thickness was of the order of micrometers. The pressure range was from 1p(c) to 2p(c), where subscript "c" corresponds to the critical point of water; the heat flux density through the probe surface was of the order of 10 MW/m(2). A sharp decrease in the heat transfer intensity for supercritical water with respect to that of subcritical one uncharacteristic for well-known stationary measurements has been revealed. (C) 2014 Elsevier Ltd. All rights reserved.