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New Boiler Installation in London

A new boiler is sized from your radiators, bathrooms and mains flow, not from what's on the van.

House cutaway Bathroom Kitchen Boiler cupboard GAS Check the pressure: 1–1.5 bar
No call-out feeNo night or weekend surchargeFixed price before we start12-month workmanship guarantee

Gas Safe installation, manufacturer warranty registered for you, and the system flushed so the new boiler doesn't inherit the old one's sludge.

New boiler installation in London: what the price includes

  • 01
    Proper sizing survey

    Heat loss, hot water demand and mains flow measured, oversized boilers short-cycle and die young.

  • 02
    Major brands, real warranties

    Fitted to manufacturer spec so the 7–12 year warranties actually hold, and registered before we leave.

  • 03
    System cleanse included

    Flush and inhibitor with a magnetic filter fitted, the warranty small print demands it and so do we.

  • 04
    Old boiler handled

    Decommissioned, removed, and the paperwork (Building Regs notification, Benchmark) done properly.

Local conditions we work around

A new boiler in London is only as good as what it is connected to. Hard water at 280 to 320 ppm will scale a brand-new heat exchanger if the system is not flushed and treated first, which is why a chemical or power flush and a scale reducer on the mains are part of the specification here rather than an upsell. In flats, flue routing and termination into lightwells and shared elevations, plus freeholder consent, are settled at survey before a date is offered.

Areas we cover

One rate card for all of these areas, with no extra charge for distance. Every area page lists the streets it covers.

New boiler installation in London, your questions

What does a new boiler cost in London?
A like-for-like combi swap from £1,850 fitted. Conversions (regular-to-combi, relocations) run £2,800–£4,500. The quote is fixed after the survey and includes the flush, filter and paperwork.
Which brand should I choose?
The honest answer: the mainstream brands are closer than the forums admit, and the installation quality matters more than the badge. We fit what suits the budget and parts availability in your area, and say why.
How long does installation take?
A straight swap is one day. Conversions and relocations, two to three. Heating and hot water are back on the same evening in either case.
Is my old boiler worth repairing instead?
If the repair is under a third of replacement cost and the boiler is under ten years old, usually yes. We quote both when it's genuinely close and let the numbers decide.

New Boiler Installation? Call.

A person answers, not a menu, and you hear the arrival time and price range before you hang up.

020 3674 8514

Or WhatsApp 07865 292684