Results of research of Z-pinch discharge initiated by wire explosion in dense hydrogen at an initial pressure up to 160M Pa and discharge-current amplitude up to 1.5M A are presented. Two mechanisms of heat exchange between an arc and gas are considered. The first - at a current amplitude exceeding 1MA, and an initial gas pressure of 5-30 MPa. Under these conditions the radiative contraction of the discharge channel is observed at which the temperature of the compressed area achieves hundreds of electron-volts. Gas is heated due to the absorption of soft X-ray quanta with efficiency of ～ 20 - 25%. The second - at a current amplitude of ～ 500kA, and an initial gas pressure of 80 - 160MPa is caused by the acoustic waves arising as a result of the discharge radius fluctuations. The temperature of the channel does not exceed 10 - 20eV, and efficiency of gas heating is close to 100%.
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