Where is make-up water added in a hot water boiler?

Make-up water in a hot water boiler is typically added in the return line. This process ensures that the water entering the boiler is at a lower temperature compared to the supply line, allowing for efficient heating and minimizing thermal shock to the boiler components. By introducing make-up water in the return line, it can blend with the cooler water before it re-enters the boiler, promoting uniform heating throughout the system.

Adding make-up water in the return line also helps address any loss of water due to evaporation, leaks, or system purging, thus maintaining the proper water level and pressure necessary for effective boiler operation. This addition point is crucial for maintaining the overall efficiency and longevity of the boiler system.