If sludge and debris is not removed from heating systems, it can accumulate in radiators, pipework and heat exchangers, causing severe blockages. This diminishes the transfer of heat and can result in pipe, radiator valve and heating control servo valve damage. In some cases this will eventually lead to the premature failure of the boiler.
Powerflushing is a popular method of cleaning and maintaining a central heating system. A powerflushing unit sends water at high velocity through the system to dislodge and remove debris, limescale, and sludge build-up. A thorough powerflush will improve heat distribution throughout the property, subsequently lowering household energy bills and increasing system reliability.
How does a powerflush work?
During the preliminary assessment, we will explain the work involved and the expected cost savings.
Prior to beginning with the work Hunt Stephenson Plumbing & Heating Ltd will check the boiler for correct operation and all the radiators for cold spots, ideally taking the temperature of each radiator.
When all radiator valves have actually been removed or opened, dust sheets placed over carpets etc, the power flushing machine can be connected.
The first flush involves a chemical power flush of the entire system consisting of a reverse circulation, this normally takes around 20 to 60 minutes. Each specific radiator is then flushed individually, starting with the coldest radiators. A rubber mallet can be used to relax any scale/sludge. This procedure is then duplicated across all the radiators.
A 2nd flush happens throughout all radiators separately. The second part of the process involves adding cleaning chemicals which have been specifically made to suit your boiler. The fluid is then reversed periodically until all cold spots have been removed from the system. A rubber mallet is also used to gently knock the bottoms of the radiators to free any bits of rust that are reluctant to leave the system.
A final flush of the system is then carried out using fresh water whilst checking the PH & TDS readings of the water being discharged. (All chemicals are neutralised before being removed safely).
An inhibitor is added to the water and distributed through the system for 15 minutes. A sample is then taken and tested, more inhibitor can be included if needed. The TRVs (thermostatic radiator valves) are then refitted and set to the optimum setting as the system is ‘balanced’).