What component controls the water inlet effectively in a hot water system?

The float valve serves a crucial role in controlling the water inlet in a hot water system. Its primary function is to maintain a consistent water level within a storage tank or cistern. The float valve operates based on buoyancy; as the water level rises, the float also rises, eventually sealing the inlet to stop the flow of water when the desired level is reached. Conversely, when water is used and the level falls, the float drops, allowing the valve to open and refill the tank.

In a hot water system, maintaining the right water level is essential for efficient operation, as it ensures that there is enough water available for heating while preventing unnecessary overflow. This mechanism is particularly important for systems like hot water storage tanks where a consistent water level directly influences the system's efficiency and performance.