Which device helps control room temperature in a hydronic heating system?

The device that helps control room temperature in a hydronic heating system is the thermostat. A thermostat is a critical component that detects the current temperature in a room and sends signals to the system to either heat or cool the space to maintain a desired setpoint. It works by monitoring the ambient temperature and activating or deactivating the heating source, such as the boiler, based on the temperature settings input by the user.

In the context of hydronic heating systems, when the room temperature drops below the setpoint, the thermostat signals the boiler to heat the water, which then circulates through the radiators or underfloor heating, effectively warming the room. Conversely, when the desired temperature is reached, the thermostat will stop the boiler, preventing unnecessary heating.

While other components like the radiator, boiler, and heat exchanger play vital roles in the overall system, they do not directly control the temperature setting. The radiator distributes heat, the boiler generates it, and the heat exchanger facilitates the transfer of heat, but it is the thermostat that maintains the desired comfortable indoor environment.