New experimental excess molar enthalpy data (376 points) of the ternary systems 1-butoxybutane + propan-1-ol +1-hex-1-ene, or heptane, or 2,2,4-trimethylpentane and the corresponding binary systems at (298.15 and 313.15) K at atmospheric pressure are reported. A quasi-isothermal flow calorimeter has been used to make the measurements. All of the binary and ternary systems show endothermic character at both temperatures. The experimental data for the binary systems have been fitted using the rational equations.