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Planned work · London · from £130 diagnosed & fixed

Boiler Repair in London

Fault codes, lockouts, pressure loss, cold spots, diagnosed by Gas Safe engineers who carry the common parts and quote the.

Get a fixed quote Or call 020 3674 8514
Boiler repair in London
No call-out feeNo night or weekend surchargeFixed price before we start12-month workmanship guarantee

fix before touching it. For a boiler that's died completely, see the emergency page.

What you get

Boiler repair in London: what the price includes

  • 01
    Diagnosis with evidence

    You see the failed part and the reading that condemned it, not just a nod and an invoice.

  • 02
    Common parts carried

    Diverter valves, pumps, PRVs, expansion vessels and ignition parts for mainstream brands.

  • 03
    Recurring faults ended

    A boiler that needs monthly top-ups has a leak somewhere, we chase causes, not symptoms.

  • 04
    Repair-vs-replace honesty

    Real numbers for both when age makes it a fair question.

  • 05
    Parts on the van for the common failures

    Fans, pressure sensors, diverter valve cartridges, PRVs and expansion vessels for the major brands are carried, because a repair that needs a second visit costs you a day of heating. Where a part genuinely has to be ordered we say so on the first visit and give you a date.

What this means in London

Local conditions we work around

Hard water is the defining fact for London heating. At 280 to 320 ppm, scale builds on the hottest surface in the system, which is the boiler heat exchanger, and every millimetre of it costs efficiency and shortens the life of the unit. It is why we flush before commissioning a new boiler, why we fit a scale reducer on the mains where the system warrants it, and why an unvented cylinder in London needs its annual service rather more than the manual implies.

Where we do this in London

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.

CamdenClaphamWandsworthNotting HillPutneyHackneyBatterseaBalhamRichmondTwickenhamWimbledonGreenwich All London areas →
Straight answers

Boiler repair in London, your questions

What does a boiler repair cost?
£130–£420 including parts covers the large majority. Obsolete-boiler parts can push higher, you'll know the number before we fit anything.
Why does my boiler keep losing pressure?
The water is going somewhere: a weeping radiator valve, an internal PRV passing to the outside pipe, or a failing expansion vessel. Ten minutes of checks finds which, topping up weekly just postpones the finding.
Do you repair back boilers / very old units?
Where parts exist, yes. Where they've been obsolete for a decade we say so straight away rather than hunting parts on your clock.
Is it worth repairing or should I replace?
Our rule of thumb: if the repair is more than half the cost of a new boiler and the unit is over ten years old, replacement usually wins. Under that, repair. We will give you both figures and let you decide rather than steering you towards the bigger invoice.
Will a repair void my manufacturer warranty?
Not if it is carried out by a Gas Safe registered engineer and recorded properly, which is what we do. What does void warranties is missed annual servicing, worth checking your paperwork before assuming you are covered.
My boiler works but makes a banging noise.
Kettling, and in London it is usually scale on the heat exchanger restricting flow. A power flush and a scale reducer address the cause. Ignored, it overheats the exchanger and turns a maintenance job into a replacement.
How does London hard water affect heating work?
Considerably. Scale builds on the hottest surface in the system, which is the boiler heat exchanger, and every millimetre costs efficiency and life. It is why we flush before commissioning a new boiler here, why kettling is the most common noise complaint we get in London, and why an unvented cylinder in this city genuinely needs its annual service rather than nominally needing it.
24 hours · 365 days · London

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 8514

Or WhatsApp 07865 292684, photos help us bring the right parts

Our engineers