How does a power flushing help my heating to work better? Power flushing provides a complete flushing out of your radiators, pipework and boiler to remove any blockages which can cause problems with the performance of your heating. A sludge and silt build up can cause noise or cold patches in your radiators or boiler. Adelphi Plumbing provide a fully qualified power flushing service throughout Preston, Whalley, Garstang, Darwen and Lancashire.