What type of gauge must be equipped on hot water heating boilers?

Hot water heating boilers require a pressure gauge to monitor the pressure of the water within the system. This is crucial for ensuring the safe and efficient operation of the boiler. The pressure gauge provides vital information about the internal pressure, which helps in preventing potential hazards such as leaks or explosions if the pressure exceeds safe limits.

In a hot water boiler system, maintaining the correct pressure is essential for efficient heating performance and to avoid damage to the boiler components. If the pressure is too low, the boiler may not function correctly, leading to inadequate heating. Conversely, if the pressure is too high, it can cause safety valves to activate or lead to boiler failure.

While temperature gauges are also important for monitoring the heat of the water, they do not provide crucial information about the pressure levels, which directly affect the integrity and performance of the heating system. Vacuum gauges are not typically used in hot water heating systems, as they measure sub-atmospheric pressures, and fuel gauges are relevant only in systems that use fuel tanks for heating instead of relying on water heating methods.