This article presents the results of experimental studies on boiling heat transfer coefficients of some aqueous solutions of mixtures of substances with limited solubility. The systems studied are: ammonium nitrate-calcium nitrate-water and potassium nitrate-calcium nitrate-wafer. Empirical equations were established for the heat transfer coefficients at different concentrations, thermal fluxes, and temperature differentials. The general form of these equations is alpha = (a - bC(n))q(m) and alpha = (a(1) - b(1)C(n1))Delta t(m1). The following formula is proposed for the boiling heat transfer coefficient of aqueous solutions of substances with limited solubility: alpha(am) = m(1 alpha 1) + m(2 alpha 2).