A method for increasing the performance ratio of a heat generator in a heating installation, which generates heat from final energy and heats a heat transfer medium circulating in a pipe circuit comprising flow and return flow of the heating installation, wherein the following method steps are carried out: (a) measuring the return flow temperature (θ R) of the heat transfer medium and the differential pressure (dp) of a heating circuit pump in the heating installation; determining a supply state value which indicates the heat requirement of the heat consumers connected to the pipe circuit of the heating installation, which heat requirement is to be covered by the heating installation, characterized by the following method steps: checking whether the supply state value lies within a predefined value range which permits lowering the differential pressure (dp) without the heating installation having a supply shortage state; (c) lowering the differential pressure (dp) by a predetermined differential pressure decrement (Δ dp dek) and waiting for a change period which is dimensioned such that changing the differential pressure (dp) has effects in the heating installation; (d) measuring the return flow temperature ( θ R) and determining the return flow temperature change (Δθ R) after the change of the differential pressure ( dp); (e) determining a supply state value after the change of the differential pressure ( dp); (f) checking whether the return flow temperature change (Δθ R) is less than zero and whether the supply state value is within the predefined value range, wherein in this case, the method is continued with method step (c); (g) checking whether the return flow temperature change (Δθ R) is greater than zero, wherein in this case, the differential pressure (dp) is increased by a differential pressure increment (Δ dp ink), a change period is waited for and the method is continued with method step (d); (h) checking whether the supply state value is outside the predefined value range, wherein in this case, the differential pressure (dp) is increased by a differential pressure increment (Δ dp ink), a change period is waited for and the method is continued with the method step (d). (a) measuring the return flow temperature (θ R) of the heat transfer medium and the differential pressure (dp) of a heating circuit pump in the heating installation; determining a supply state value which indicates the heat requirement of the heat consumers connected to the pipe circuit of the heating installation, which heat requirement is to be covered by the heating installation, checking whether the supply state value lies within a predefined value range which permits lowering the differential pressure (dp) without the heating installation having a supply shortage state; (c) lowering the differential pressure (dp) by a predetermined differential pressure decrement (Δ dp dek) and waiting for a change period which is dimensioned such that changing the differential pressure (dp) has effects in the heating installation; (d) measuring the return flow temperature ( θ R) and determining the return flow temperature change (Δθ R) after the change of the differential pressure ( dp); (e) determining a supply state value after the change of the differential pressure ( dp); (f) checking whether the return flow temperature change (Δθ R) is less than zero and whether the supply state value is within the predefined value range, wherein in this case, the method is continued with method step (c); (g) checking whether the return flow temperature change (Δθ R) is greater than zero, wherein in this case, the differential pressure (dp) is increased by a differential pressure increment (Δ dp ink), a change period is waited for and the method is continued with method step (d); (h) checking whether the supply state value is outside the predefined value range, wherein in this case, the differential pressure (dp) is increased by a differential pressure increment (Δ dp ink), a change period is waited for and the method is continued with the method step (d).