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55+ years

Trading in London

24/7
Emergency
76%
Repeat customers
12 month
Guarantee
24/7 Gas Safe Registered Engineers

Boiler Repair & Breakdown Service In London

All Manufacturers - Within 1 Hour Response

Suffering a boiler breakdown with no hot water or heating is a truly horrible experience. Our London-wide boiler repair emergency service is available 24 hours a day.
Call 0207 386 8888
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55+ years

Trading in London

24/7
Emergency
76%
Repeat customers
12 month
Guarantee
24/7 Emergency Repairs - All Manufacturers
Boiler Repair Specialists

Boiler Repair In London

Our tidy, efficient and courteous boiler repair specialists can be with you within 1 hour to get your hot water and heating back to normal as soon as possible. Our aim is to complete a first-time fix, parts permitting.

We have a great deal of experience fixing boilers of all manufacturers, including Potterton, Ariston, Ideal, Biasi, Baxi, Ferroli, Glow-worm, Halstead, Alpha, Heatline, Keston, Sime, Vokera, Viessmann, Vaillant, Worcester Bosch and Saunier Duval.

We also repair Gledhill cylinders and install new Gledhill or Elson Thermal Stores, as well as carrying out repairs on gas or electric water heaters such as Chaffoteaux & Maury and Main Mersey.

Our professional boiler engineers are trained in-house and work to the highest standard, with all work guaranteed for 12 months. Having your boiler serviced regularly will quite often avoid those unexpected breakdowns – find out more about our boiler services here.

Leaks & Water Escape

Leaks & Water Escape Issues Linked To Boiler Repair

A leaking boiler is never something to ignore – even a small drip can point to a bigger underlying issue, and left unchecked it can cause damage to your property and surrounding electrics. Common causes we diagnose and fix include:

  • A faulty pressure relief valve releasing water
  • A failed pump seal
  • Corroded or failed pipe joints inside the boiler
  • A cracked heat exchanger
  • Condensate pipe blockages causing back-up and overflow

If you notice water pooling around your boiler, turn off the boiler and the water supply to it if you can do so safely, and call us – we’ll talk you through what to do until our engineer arrives. Find out more about water leaks on our dedicated page.

Pipework

Pipework Associated With Boiler Repairs

Boiler repairs sometimes extend beyond the unit itself into the pipework feeding it. Where pipework needs attention, we always run new sections in copper – it’s more reliable and lasts decades when properly soldered. Pipework issues we commonly deal with alongside a boiler repair include:
  • Corroded or leaking pipe joints near the boiler
  • Pipework affected by limescale or sludge build-up
  • Incorrectly sized pipework causing pressure or flow issues
  • Condensate pipework that's frozen or blocked
If a wider issue with your heating system’s pipework is found during a repair, we’ll explain it clearly and quote separately before any extra work begins – we won’t expand the job without your agreement.
Trust & Qualifications

Qualified, Accountable Engineers

When you book a repair with Anderson & Sons, you’re booking a fully qualified, accountable engineer – not a stranger off an app. Here’s what that means in practice:

Gas Safe Registered

Every engineer attending your repair is individually registered with Gas Safe, the official body responsible for gas safety in the UK. ID cards available on request.

Directly Employed

Our engineers work for us, not as subcontractors. They’re trained in-house and most have been with the company for several years.

Manufacturer Accredited

Approved installers and repairers for Vaillant and Worcester Bosch, with engineers trained to each manufacturer’s own technical standards.

APHC & CIPHE Members

Members of the Association of Plumbing & Heating Contractors and the Chartered Institute of Plumbing & Heating Engineering.

Over 55 Years' Experience

Trading since 1966, with a team that has repaired boilers across London for decades – in every brand and configuration.

Award-Winning Service

Named Best Boiler Installer for London at the Energy Efficiency Awards.
Transparent Pricing

Repair Cost Estimates & Pricing Expectations

We work on an hourly rate with no call-out charge – you only pay for the time our engineer is on site, plus any parts required. The first hour is payable at the time of booking, and rates vary depending on when the work takes place.

Mon-Fri, 8am-5pm

£95 per hour

Saturday, 8am-3pm

£115 per hour

Evenings, Weekends & Sundays

£160 per hour

Out-Of-Hours Emergency

From £190 per hour

Please Note:All rates are exclusive of VAT, and don’t include the cost of parts or materials. Congestion charge, ULEZ and parking costs are added where applicable. For full details and our complete price list, see our Pricing page.

Common Issues

Types Of Boiler Repair & Common Boiler Issues

Some of the most frequent boiler problems we’re called out for in London homes.

No Heating Or Hot Water

Often caused by a faulty diverter valve, airlock, or a problem with the PCB.

Boiler Losing Pressure

Usually points to a small leak somewhere in the system, or a faulty pressure relief valve.

Strange Noises (Banging, Gurgling)

Frequently caused by trapped air, limescale build-up, or a failing pump.

Boiler Keeps Switching Off

Can be caused by low water pressure, a faulty thermostat, or trapped air in the system.

Pilot Light Keeps Going Out

Often a thermocouple issue, or a problem with the gas supply itself.

Radiators Not Heating Up

Commonly down to trapped air, a balancing issue, or sludge restricting flow – sometimes resolved with a power flush.

Boiler Showing An Error Code

Each manufacturer uses different codes – our engineers carry reference guides for every major brand we work with.

Leaking Or Dripping Boiler

Never ignore this, even if the drip seems minor – it can point to a bigger underlying issue.

Frozen Condensate Pipe

Common in winter – causes the boiler to lock out as a safety measure until cleared.
First-Time Fix

Boiler Spare Parts & Component Replacement

Many boiler breakdowns come down to a single faulty part rather than the whole unit. We carry a wide range of commonly needed spare parts with us, which often means we can complete a first-time fix on the same visit. Components we frequently replace include:

Diverter Valves

Pressure Relief Valves

PCBs (Printed Circuit Boards)

Pumps

Heat Exchangers

Fans

Thermostats & Sensors

Ignition Leads & Electrodes

Expansion Vessels

Filling Loops

Seals & Gaskets

Condensate Traps

Where a part isn’t held in stock, we’ll source it as quickly as possible and keep you updated throughout – we’re always upfront about what’s needed and why before any replacement work goes ahead.
How It Works

On-Site Estimates & Diagnostic Visits

Some boiler faults are obvious from the symptoms you describe over the phone. Others need a proper diagnostic visit before we can say exactly what’s wrong and what it’ll cost to fix. Either way, here’s what to expect:

Step 01

Step 1 - Tell Us What's Happening

We’ll ask about error codes, noises, loss of heat or hot water – to get an early idea of the likely cause.
Step 02

Step 2 - Engineer Attends

Your Gas Safe registered engineer arrives and runs a full diagnostic check on the boiler.
Step 03

Step 3 - Diagnosis Explained

We explain what we’ve found in plain English, with no jargon.
Step 04

Step 4 - Clear Cost Estimate

You’ll get a clear cost estimate for the repair before any further work goes ahead.
Step 05

Step 5 - Repair Carried Out

With your go-ahead, we carry out the repair – often on the same visit, parts permitting.
The first hour of any visit, including diagnostics, is payable at the time of booking. If parts are required that we don’t carry with us, we’ll let you know the likely additional cost and timescale before ordering them.
Why Us

Why Choose Anderson & Sons?

Qualified Gas Safe Engineers

Experience across every major boiler manufacturer.

Within 1 Hour

We aim to be with you within 1 hour of your call for a boiler breakdown.

First-Time Fix

Our goal is always to resolve the issue on the first visit, parts permitting.

12 Months Guaranteed

All boiler repair work is guaranteed for a full 12 months.
Coverage

Areas We Cover

We carry out emergency boiler repairs across South and West London, from our base in Fulham.

Fulham

Chelsea

Putney

Barnes

Wandsworth

Battersea

Notting Hill

Kensington

Hammersmith

View All Areas
FAQs

Frequently Asked Questions

We aim to be with you within 1 hour for emergency boiler breakdowns in our coverage area. Call us on 0207 386 8888, 24 hours a day, 7 days a week.
No – we work on an hourly rate with no call-out charge. You only pay for the time our engineer is on site, plus any parts required. The first hour is payable at the time of booking.
We repair all makes and models, including Potterton, Ariston, Ideal, Biasi, Baxi, Ferroli, Glow-worm, Halstead, Alpha, Heatline, Keston, Sime, Vokera, Viessmann, Vaillant, Worcester Bosch and Saunier Duval.
Our aim is always a first-time fix, parts permitting. We carry a wide range of commonly needed spare parts so we can often complete the repair on the same visit. Where a part isn’t held in stock, we’ll source it as quickly as possible.
Yes – all boiler repair work we carry out is guaranteed for a full 12 months.
Yes – our Gas Safe commercial engineers repair boilers in schools, hotels, office blocks, factories and swimming pools across London.
Get In Touch

Ready To Book?

Ready to book or need urgent help? Call us on 0207 386 8888 – 24 hours a day, 7 days a week – or use the contact form below.

Get In Touch - Homepage

Please Note: Congestion charges and parking costs (if not available) are in addition. Prices are exclusive of VAT. The first hour charge is payable at the time of booking. All prices are per hour and VAT is charged separately. View our pricing here

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