Central Heating Repair in London
Cold radiators with a hot boiler is a circulation problem, air, sludge, a stuck valve or a tired pump.

The pattern of which radiators are cold tells most of the story before we even arrive.
Central heating repair in London: what the price includes
- 01Diagnosis by pattern
Cold at the top: air. Cold at the bottom: sludge. Cold at the far end: balancing or pump. Random: motorised valve. We read the system, then fix it.
- 02Pumps and valves
Circulators, zone valves and actuators carried for same-visit replacement.
- 03Balancing done properly
Whole-system balancing so the far bedroom finally warms without cooking the hallway.
- 04Controls upgrades
Failed programmers and thermostats replaced, smart controls fitted where they genuinely help.
- 05Diagnosed as a system, not as a symptom
One cold radiator is a balancing or valve problem. Cold at the bottom across several is sludge. Cold at the top is air. Everything cold is a pump, a valve or a control. We establish which pattern yours is before anyone starts bleeding radiators at random.
Local conditions we work around
Cold spots at the bottom of London radiators are usually sludge; cold at the top is air; and a system that needs repressurising every few weeks has a leak rather than a habit. Hard water complicates all three, because scale in the boiler and deposits through the system reduce circulation and make balancing harder to hold. Where a system has been extended over decades, very common in London's subdivided housing, the original pipe sizing is frequently the real limit rather than any single faulty component.
Covered across London
Same published rate card and the same twelve-month workmanship guarantee everywhere below, there is no postcode loading. Each area has its own page with an arrival time taken from our job records rather than chosen for a website.
Central heating repair in London, your questions
Some radiators are hot and some cold, why?
What does a typical circulation repair cost?
Is banging or kettling serious?
Why is one radiator always cold?
My upstairs is hot and downstairs is cold.
Do I need a magnetic filter?
How does London hard water affect heating work?
Water where it
shouldn't be? Call.
A person answers, not a menu. You'll have an arrival time and a price range before you hang up.
020 3674 8514Or WhatsApp 07865 292684, photos help us bring the right parts

