A method of balancing a heating system , wherein the heating system comprises: - a flow system comprising a supply flow line and a return flow line , - a heat source and at least a first pump coupled to the flow system and pumping fluid through the heat source to the flow system, and - a plurality of hydraulic lines ( L 1 -L n ) between the supply flow line and the return flow line, at least a number of which have a heating element ( H 1 -H n ) with a dedicated balancing valve ( V 1 -V n ) and optionally a regulation valve ( W 1 -W 2 ), the method comprises the steps of: A) carrying out one or more measurements for each of the hydraulic lines by opening one hydraulic line only and determining a flow rate (q) through the pump and a pressure difference (Δ p ) across the pump, characterised in that the method further comprises the steps of: B) establishing a hydraulic model for at least a part of the heating system based on the determined flow rate and pressure difference from at least two measurements from step A), and at least one additional measurement for at least two hydraulic lines from step A), wherein said at least one additional measurement is carried out with said at least two hydraulic lines being open, C) specifying a desired flow rate ( q j ) for each of the hydraulic lines, and D) adjusting one or more of the dedicated balancing valves ( V 1 -V n ) in order to meet the desired flow rate ( q j ) for each of the hydraulic lines by using the hydraulic model. - a flow system comprising a supply flow line and a return flow line , - a heat source and at least a first pump coupled to the flow system and pumping fluid through the heat source to the flow system, and - a plurality of hydraulic lines ( L 1 -L n ) between the supply flow line and the return flow line, at least a number of which have a heating element ( H 1 -H n ) with a dedicated balancing valve ( V 1 -V n ) and optionally a regulation valve ( W 1 -W 2 ), the method comprises the steps of: A) carrying out one or more measurements for each of the hydraulic lines by opening one hydraulic line only and determining a flow rate (q) through the pump and a pressure difference (Δ p ) across the pump, characterised in that the method further comprises the steps of: B) establishing a hydraulic model for at least a part of the heating system based on the determined flow rate and pressure difference from at least two measurements from step A), and at least one additional measurement for at least two hydraulic lines from step A), wherein said at least one additional measurement is carried out with said at least two hydraulic lines being open, C) specifying a desired flow rate ( q j ) for each of the hydraulic lines, and D) adjusting one or more of the dedicated balancing valves ( V 1 -V n ) in order to meet the desired flow rate ( q j ) for each of the hydraulic lines by using the hydraulic model. A) carrying out one or more measurements for each of the hydraulic lines by opening one hydraulic line only and determining a flow rate (q) through the pump and a pressure difference (Δ p ) across the pump, characterised in that the method further comprises the steps of: B) establishing a hydraulic model for at least a part of the heating system based on the determined flow rate and pressure difference from at least two measurements from step A), and at least one additional measurement for at least two hydraulic lines from step A), wherein said at least one additional measurement is carried out with said at least two hydraulic lines being open, C) specifying a desired flow rate ( q j ) for each of the hydraulic lines, and D) adjusting one or more of the dedicated balancing valves ( V 1 -V n ) in order to meet the desired flow rate ( q j ) for each of the hydraulic lines by using the hydraulic model. <EOS>