Method of operating a heat supply system

A heat supply system comprising:

• a heat source adapted to heat a heat transfer fluid;
• a system controller adapted to control said heat source so as to determine an outlet temperature of said heat transfer fluid at an outlet of said heat source based on a heating curve defining a raw outlet temperature of said heat source in inverse proportion to an outside temperature;
• and
• at least two heat exchangers, each of the at least two heat exchangers being configured to receive said heat transfer fluid and being provided with a respective controllable valve at an inlet or outlet of the respective one of the at least two heat exchangers, each said controllable valve being associated with a direct or indirect flow rate measurement transmitted to said system controller;
• wherein said heat supply system is adapted to be operated according to a method comprising said system controller carrying out steps of:
• receiving signals relating to said direct or indirect flow rate measurements associated with said controllable valves corresponding to the controllable valve's current respective direct or indirect flow rate measurements;
• calculating a weighted average of said direct or indirect flow rate measurements;
• adding an offset to said raw outlet temperature based on said weighted average to generate an offset raw outlet temperature such that a decrease in said weighted average causes a decrease in said offset raw outlet temperature, and an increase in said weighted average causes an increase in said offset raw outlet temperature;
• and
• determining said outlet temperature based on said offset raw outlet temperature.