Power flushing cleans the pipes, the radiators, pumps, the boiler itself and all other components in the heating system that are required for its proper functioning. You will know that your boiler needs a power flush when you bleed a radiator and find that the water coming out is brown and full of rust. It may also become necessary when you find cold spots on radiators, which is a result of the hot water not being properly distributed, due to sections within it being clogged. The boiler can become noisy and energy bills will increase, all pointing to the need to know what is boiler power flushing and its ability to reduce the problems of an inefficient heating system.