Boiler Replacement London | Old Boiler Replaced from £1,800

Pristine Gas Ltd replaces old and inefficient boilers across London from £1,800. Our Gas Safe Registered engineer Ralf removes the old unit and installs a new A-rated boiler, including system flush, smart thermostat, and Gas Safe certificate, in one day. We cover Holborn WC1N, Maida Vale W9, and all London postcodes. Call 07472 251465 for a free assessment.

A boiler replacement is one of the most impactful home improvements you can make in terms of energy efficiency and reliability. Modern A-rated condensing boilers are typically 90% or more efficient, compared to older G-rated boilers at 65–70%. The difference is measurable immediately in your gas bills.

Every replacement includes a system flush, magnetic filter, and smart thermostat as standard. Ralf carries out a full system test and walks you through the new controls before leaving.

At a Glance

Pristine Gas Ltd replaces old and inefficient boilers across London from £1,800, including removal of the old unit, installation of a new A-rated boiler, system flush, and Gas Safe certificate — completed in one day. Call 07472 251465 for a free assessment.

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Signs Your Boiler Needs Replacing

These are the indicators that a replacement is more cost-effective than another repair. If several apply simultaneously, the case for replacement is strong.

Over 12 years old — the average lifespan of a well-maintained boiler is 12–15 years
Breaks down more than once a year — repeated call-outs add up quickly and signal declining reliability
D-rated efficiency or below — boilers fitted before 2005 are likely to be significantly less efficient than modern A-rated units
Spare parts no longer available — discontinued models cannot be repaired when major components fail
Repair cost exceeds 50% of replacement cost — the crossover point beyond which replacement is almost always better value
Yellow or orange flame instead of blue — a safety issue that requires immediate assessment

Repair or Replace?

Ralf will always give you an honest assessment. If your boiler has a fault that can be repaired cost-effectively, he will say so. He will not push you towards a replacement you do not need.

As a general rule: if the repair cost is less than a third of the replacement cost and the boiler is under 10 years old with a good service history, repair is usually the better choice. If the boiler is older, repeatedly failing, or G-rated, replacement almost always delivers better value within the first two years through lower energy bills and zero breakdown costs.

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What is Included in the Replacement Price?

Every boiler replacement with Pristine Gas Ltd is a complete, fixed-price job. The price quoted before work begins covers everything below — no unexpected extras on completion.

Removal and responsible disposal of old boiler
Supply of new A-rated boiler
Full system flush
Magnetic system filter (Fernox TF1 or Adey MagnaClean)
Smart thermostat (Hive or Nest)
Carbon monoxide alarm
Gas Safe installation certificate
Full system test and customer handover

Next-Day Replacement Available

If your boiler has failed and you need a replacement quickly, call 07472 251465. Pristine Gas Ltd can often arrange next-day replacement across all London postcodes. Ralf will confirm availability and a fixed price on the call.

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Boiler Brands We Supply and Fit

We install the brands we trust and have worked with for years. Every boiler we fit is A-rated and carries a manufacturer warranty.

Vaillant ecoFIT pure & ecoTEC

Vaillant’s most popular range. The ecoFIT pure suits flats and smaller homes; the ecoTEC is better for larger properties with higher hot water demand. Both carry a 5-year warranty when registered and serviced annually. The most frequently fitted brand in our London replacement jobs.

Worcester Bosch Greenstar

The UK’s most trusted boiler brand. The Greenstar 4000 and 8000 series offer outstanding reliability and long parts availability. Extended warranties of up to 12 years are available through the Worcester Bosch Accredited Installer scheme.

Ideal Logic Plus & Vogue

Ideal offers strong value at both ends of the market. The Logic Plus is an excellent budget-conscious choice for landlords and single-bathroom properties. The Vogue delivers higher efficiency and longer warranty coverage for larger homes.

Not Sure Which Brand?

Call 07472 251465 for a recommendation. Ralf will assess your property, hot water demand, and budget and advise on the model that delivers the best long-term value — not the most expensive option on the list.

Boiler Replacement Pricing in London

Boiler replacement with Pristine Gas Ltd starts from £1,800. This is a complete, all-inclusive price. The exact figure depends on the boiler model, whether a power flush is required, and any pipework modifications needed. Call 07472 251465 for a free, no-obligation quote.

Boiler replacement from £1,800 — all-inclusive
Fixed price confirmed before any work begins
Next-day replacement available
Finance options available — call to discuss
Payment by cash, bank transfer, or card

Free Assessment Before You Commit

Ralf will assess your current boiler and system, confirm whether replacement is the right decision, recommend the best replacement model, and give you a fixed price. No pressure. No obligation. Call 07472 251465.

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What Customers Say About Our Boiler Replacement Service

★★★★★

“I recently had my boiler replaced and couldn’t be happier with the service from this gas and heating company. From start to finish, they were reliable, efficient, and incredibly easy to communicate with. A special mention goes to Rina, who was absolutely fantastic throughout the entire process. The installation itself was completed to a high standard, with everything left clean and tidy. My new boiler is running perfectly, and the whole experience was stress-free.”

IKEAPAX UK

Google Review — Boiler Replacement, London

★★★★★

“I have used Ralph for nearly ten years for all my plumbing and heating needs, including a full gas boiler replacement, and the standard of work has always been exceptional. He is highly skilled, works quickly without ever cutting corners, and takes genuine care with both the job and my home. Completely trustworthy, consistently dependable.”

Jonathan Rees

Google Review — Boiler Replacement, London

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Boiler Replacement — Common Questions

How do I know if my boiler needs replacing rather than repairing?

A boiler generally needs replacing if it is over 12 years old, has broken down more than once in the past year, is rated D or below on efficiency, has spare parts that are no longer available, or if the repair cost exceeds 50% of the replacement cost. Call 07472 251465 and Ralf will give you an honest, no-pressure assessment.

How long does a boiler replacement take?

Most boiler replacements are completed in one day. Ralf removes the old boiler, fits the new unit, connects the smart thermostat, flushes the system, tests all radiators, and hands over the Gas Safe installation certificate before leaving. More complex jobs such as system type changes may require a second day — this is confirmed at the quotation stage.

What boiler brands do you supply and fit?

Pristine Gas Ltd supplies and installs Vaillant ecoFIT pure, Vaillant ecoTEC, Worcester Bosch Greenstar, Ideal Logic Plus, and Ideal Vogue. We recommend the brand and output that best suits your property, hot water demand, and budget. Call 07472 251465 for a recommendation.

Is a power flush needed when replacing a boiler?

If your existing system has sludge or magnetite build-up, a power flush is required before the new boiler is fitted. Most manufacturers require a clean system as a warranty condition. Ralf will assess the system and advise honestly before any work is booked. If a power flush is needed, it can be scheduled in the same visit as the replacement.

Areas Covered for Boiler Replacement

Pristine Gas Ltd replaces boilers across all London postcodes. Based in Holborn WC1N, our primary service areas include Maida Vale W9, St John’s Wood NW8, Islington N1, Brent Cross NW4, Shepherd’s Bush W12, and Acton W3. Next-day replacement available in all primary areas.

Holborn WC1N Maida Vale W9 St John’s Wood NW8 Islington N1 Brent Cross NW4 Shepherd’s Bush W12 Acton W3

We also cover NW1, NW9, NW10, W8, W10, W12, W14, E8, E14, E16, N13, SW6, SE11, and St Albans AL1.

Boiler Replacement in London — Fast, Reliable, from £1,800