Are your radiators cold in certain places when your heating is turned on?
Are they slow to heat up?
Black Sludge whilst bleeding radiators?
If so, you may need a Powerflush as you have a build up of sludge and sediment in your system.
Key Benefits Of A Powerflush
Increased boiler efficiency reducing gas bills
Elimination of radiator cold spots
Increased pump life and internal boiler parts
Elimination of kettling and pipework noises