A radiator job ranges from the simple to the telling. Swapping a tired radiator for a new one, adding a radiator to a cold room, or moving one to make space for a kitchen are straightforward. A radiator cold at the top, cold at the bottom, or cold while the rest of the house is warm is a different signal, usually trapped air or a build-up of sludge in the system, and worth understanding rather than just bleeding every few weeks. As a Gas Safe registered heating business, LMB handles the radiator and the system behind it.
Cold spots, sludge and what they mean
Cold at the top usually means trapped air, a bleed fixes it. Cold at the bottom while the top is warm points to sludge, magnetite that has settled in the bottom of the radiator and restricts flow, which a system that has never been protected slowly builds up. Several radiators struggling, or black water when you bleed them, suggests the whole system would benefit from a power flush and an inhibitor rather than treating one radiator at a time. The honest version of this matters, because replacing a radiator that is only blocked with sludge fixes nothing.
New radiators, valves, thermostatic radiator valves and full installs are all standard work, and because the same engineer covers the boiler, the radiators and the controls, the heating is treated as one system rather than a list of separate parts.
