Why Brighouse Systems Fill With Sludge Rather Than Limescale
Plenty of the heating problems we are called to in Brighouse get blamed on limescale, and almost none of them are. West Yorkshire sits on soft water, so the hard scale that furs up pipework in the south of England is rarely the culprit here. What builds up instead is magnetite: a black, gritty iron oxide that forms as steel radiators and older pipework slowly corrode from the inside.
It collects at the bottom of radiators first, which is why the classic complaint is a radiator that is hot across the top and stone cold along the bottom edge. Left alone it works its way round the system, settles in the heat exchanger, and makes the boiler work harder for less heat. That is when people start hearing kettling — the banging or rumbling noise that sounds alarming and usually means the exchanger is struggling to move heat into water that is no longer flowing freely.
The fix is a power flush rather than a new boiler, and on a system that is otherwise sound it is a fraction of the cost. We will always tell you honestly which of the two you are looking at. If a boiler genuinely is at the end of its life we will say so; if the system simply needs cleaning, replacing the boiler without flushing it just puts a new heat exchanger into the same dirty water.