Central boiler heating systems hold large amounts of water and heat it to produce steam. A series of pipes distribute the heated steam throughout a home or building, ending in radiators. There is typically one radiator installed per room. Over time, minerals from the water build up on the interior of the heating system, forming a scale. This scale must be removed to improve the efficiency of the heating system.
Shut off the power to the central boiler at the main fuse box for the home. If the boiler is gas powered, turn the gas line valve off and extinguish the flame. Turn off the automatic feed from the water line.