Gas Fitter Practice Test

The purpose of an aquastat in a hydronic heating system is to monitor and control the temperature of the water. It acts as a temperature-sensitive switch, turning the heating source on or off based on the temperature readings it receives. This is crucial for maintaining optimal water temperatures to ensure efficient operation and comfort. By controlling the temperature, the aquastat helps prevent overheating or excessive cooling, thus promoting energy efficiency and system longevity. Additionally, proper temperature regulation is essential to prevent damage to the system and ensure that heating is provided effectively throughout the space being serviced. In the context of the other options, controlling the water level primarily pertains to devices like water level controls rather than aquastats, which focus solely on temperature. Flow rate regulation is typically managed by pumps or valves, and the presence of air in the system is usually handled by air elimination devices, such as air vents or separators, indicating that temperature control is the primary function of an aquastat.