Here Hot boiler details including front elevation plug tee , drain pipe , bracket pipe to steel welded to boiler support through drain pipe , flue gas outlet boilers require control of three basic elements to operate safely and efficiently: water flow, air flow and fuel flow. The heat exchange surfaces for hot water boilers must be in contact with water to prevent the heat exchange surface from overheating. Low level water sensors are required to ensure this. The heat exchange surfaces for hot water boilers must be in contact with water to prevent the heat exchange surface from overheating. . Boilers are one of the chief energy-producing systems in buildings, providing space heating as well as domestic hot water supply to buildings and occupants. for more details of Hot boiler download this file.