What is one primary reason for the use of a pump in hydronic heating systems?

The primary role of a pump in hydronic heating systems is to circulate water throughout the system. This circulation is essential because it ensures that heated water is distributed efficiently to various areas of the building where heat is required. The pump creates the necessary flow and pressure, allowing water to move from the boiler, where it is heated, through the pipes to the radiators or heating terminals, and then back to the boiler to be reheated. This continuous movement of water is critical for maintaining consistent and comfortable temperatures within the space being heated.

While heating water quickly, storing excess water, and switching between heating zones are relevant considerations within a hydronic heating system, they are not the primary function of the pump. The focus on circulation underscores the importance of achieving effective and efficient thermal distribution throughout the entire system, which is fundamentally reliant on the pump's operation.