The results of further development of statistical model describing coefficients of turbulent heat transfer for the case of liquid flow in smooth circular tubes in the presence of gas bubbles are given. Experimental data are used to derive the expressions for calculating the effective coefficient of turbulent heat transfer in two regions of gas content, namely, <10% and >10%. Expressions for direct evaluation of the effect of gas bubble presence on mean heat transfer are obtained as well. 9 refs.; 3 figs.; 1 tab.