A flow control module for controlling the flow in a hydronic system, wherein the hydronic system comprises - a primary side with a first port in fluid connection with an output of at least one source element, a second port in fluid connection with an input of the at least one source element, and at least one controllable primary side flow actuator for providing a primary side flow (q 1), - a secondary side with a third port in fluid connection with an input of at least one load element, a fourth port in fluid connection with an output of the at least one load element, and at least one controllable secondary side flow actuator for providing a secondary side flow (q 2), and - an intermediary transfer element between the primary side and the secondary side, wherein the intermediary transfer element is in fluid connection with the first port, the second port, the third port and the fourth port, characterised in that the flow control module is configured to determine a measurement of a first temperature differential (ΔT c) between a temperature at the first port and a temperature at the third port in a first situation when the primary side flow (q 1) exceeds the secondary side flow (q 2) as a first offset value, and calibrate further measurements in the hydronic system by subtracting the first offset value from all subsequent measurements of the first temperature differential (ΔTc), to control the flow, and in that the flow control module is configured to determine a measurement of a second temperature differential (ΔT h) between a temperature at the fourth port and a temperature at the second port in a second situation when the secondary side flow (q 2) exceeds the primary side flow (q 1) as a second offset value, and calibrate further measurements in the hydronic system by subtracting the second offset value from all subsequent measurements of the second temperature differential (ΔTh), to control the flow. - a primary side with a first port in fluid connection with an output of at least one source element, a second port in fluid connection with an input of the at least one source element, and at least one controllable primary side flow actuator for providing a primary side flow (q 1), - a secondary side with a third port in fluid connection with an input of at least one load element, a fourth port in fluid connection with an output of the at least one load element, and at least one controllable secondary side flow actuator for providing a secondary side flow (q 2), and - an intermediary transfer element between the primary side and the secondary side, wherein the intermediary transfer element is in fluid connection with the first port, the second port, the third port and the fourth port, the flow control module is configured to determine a measurement of a first temperature differential (ΔT c) between a temperature at the first port and a temperature at the third port in a first situation when the primary side flow (q 1) exceeds the secondary side flow (q 2) as a first offset value, and calibrate further measurements in the hydronic system by subtracting the first offset value from all subsequent measurements of the first temperature differential (ΔTc), to control the flow, and in that the flow control module is configured to determine a measurement of a second temperature differential (ΔT h) between a temperature at the fourth port and a temperature at the second port in a second situation when the secondary side flow (q 2) exceeds the primary side flow (q 1) as a second offset value, and calibrate further measurements in the hydronic system by subtracting the second offset value from all subsequent measurements of the second temperature differential (ΔTh), to control the flow.