[en] Presented are the results of the experimental study of spectral characteristics of local water boiling noises in a large volume at the pressure of 1 at. The water boiling took place at horizontal tubes made of the Kh18N10T steel with the length of 50 mm diameter of 2 mm and the wall thickness of 0.1 mm. The degree of water underheating up to the saturation temperature and the density of the thermal flow on the heat transfer surface were changed in the experiments. The dependences of noise level in various frequency bands on the value of thermal flow density up to the overburning of the heat transfer surface are shown. Considered also are the changes in time of the spectral noise characteristics during the burnout development