Radiators rust internally producing black iron oxide ‘sludge’. This sludge moves around the heating system blocking pipes, valves and boilers (pumps/heat exchangers/diverter valves). The Helpful plumber can flush the central heating system to remove the sludge and particles that build up in the radiators and pipe work and this can increase your heating efficiency by 15%. We then add an inhibitor which will keep the system rust and sludge free for the next 5 years.
To summarise, flushing your system will: