Cold spots at the bottom of a radiator are a tell-tale sign that it may be blocked with sediment. This blockage, a combination of dirt and rust, prevents efficient circulation of hot water, leading to wasted energy and higher heating bills. Other indicators include brown liquid when bleeding a radiator, frequent need to bleed radiators, and loud boiler noises.
If radiators are blocked with sludge, hot water cannot circulate properly, reducing heating efficiency and increasing the risk of boiler breakdowns and system aging. This sludge build-up can be addressed by either hiring a plumber for a power flush or by performing the flush yourself.
To flush a radiator yourself, first turn off the central heating and allow radiators to cool. Isolate the radiator by turning off its valves and releasing pressure through the bleed valve. Lay towels to catch water, then remove the nuts connecting the radiator to the valves. Carefully lift the radiator off its brackets and take it outside.
Once outside, attach a garden hose to one radiator opening and turn on the mains water at full pressure. Flush for about 10 seconds, then switch the hose to the other opening and repeat. Continue flushing until the water runs clear. If flow is restricted, open the bleed valve to release trapped air.
After flushing, reinstall the radiator by carrying it back inside, reattaching it to the brackets, and tightening the valve nuts. Turn the valves back on to refill the radiator and use the bleed key to remove any trap... download the app to read more
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