Boiler repair London
Fast, reliable emergency boiler repairs available 24/7 across London.
Gas Safe registered engineers. Fixed fast, day or night.
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Emergency Repairs
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Boiler Repair Near Me
When someone searches “boiler repair near me” they want an engineer who actually knows boilers not a general plumber. Our local boiler repair service is specialised: we focus on boilers only so our engineers see and fix the same faults every day. That technical repetition lets us resolve problems faster and with fewer return visits.
We operate as a local boiler repair network across London. That means shorter travel times, quicker call‑outs for urgent repairs and engineers who understand London properties flats, period homes & new builds.
What makes our local service different: rapid attendance, diagnostic-first repairs, component-level replacements and Gas Safe certified workmanship. We also provide annual boiler service so your boiler runs smoothly all year while avoiding costly repairs.
Why Choose Onsite
When your boiler breaks down, you need an engineer you can rely on. At OnSite, we combine experienced engineers, professional workmanship and a straightforward approach to make boiler repairs as simple and stress-free as possible.
From the first diagnosis to the final checks, we focus on fixing the problem properly, keeping you informed and making sure your heating system is safe and working reliably before we leave.
Local & Reliable
Based in London, quick response times.
Gas Safe Registered
Fully qualified and insured engineers.
Transparent Pricing
No hidden costs, clear quotes before any work.
Customer Focused
Highly rated with excellent reviews.
How We Come To Help
Gas Boiler Repairs
We arrange gas boiler repairs for boilers that have stopped working, are losing pressure or are failing to provide heating or hot water. Call us to explain the problem and book a repair.
Gas Boiler Servicing
Our team handles gas boiler servicing from qualified engineers to check your boiler, identify issues and maintain its operation. Contact us to arrange a boiler service with a gas safe boiler engineer near you.
Boiler Installation
We provide boiler installation for new and replacement boilers in homes and commercial properties. Contact us to discuss your heating requirements and book an installation.
Gas Appliance Installation
Our engineers handle gas appliance installation for gas cookers, hobs, fires and water heaters. Contact us for fitting or replacement of your gas appliances.
Gas Pipework and Leak Detection
We offer gas pipework installation, replacement and repairs, including gas leak detection. Contact us to organise an assessment of your gas supply pipework.
Gas Safety Checks and Certificates
Book a gas safety check for your boiler, cooker, gas fire or other gas appliances. Following a successful inspection, we arrange your Gas Safety Certificate (CP12) for landlords.
What We Actually Do
We’re a local London team of Gas Safe registered engineers, providing reliable, high-quality boiler repairs and heating services with a focus on customer satisfaction.
01
Local & Reliable
Based in London, quick response times.
02
Gas Safe Registered
Fully qualified and insured engineers.
03
Transparent Pricing
No hidden costs, clear quotes before any work
04
Customer Focused
Highly rated with excellent reviews.
Boiler Repair London
We’re a local London team of Gas Safe registered engineers, providing reliable, high-quality boiler repairs and heating services with a focus on customer satisfaction.
Vaillant Boiler Repair
Vaillant boilers can develop faults ranging from ignition problems and pressure loss to issues with fans, sensors and electronic controls. We provide Vaillant boiler repairs across London, with engineers able to diagnose faults on combi, system and regular models. The repair starts with checking the boiler’s fault display and carrying out the relevant electrical, gas and hydraulic tests.
A boiler that repeatedly locks out or loses pressure may need more than a simple reset. Our engineers identify the underlying fault before replacing components, helping prevent the same problem from returning. Once the repair is completed, the boiler is tested and recommissioned to check that the heating and hot water are operating safely.
Ideal Heating Boiler Repair
Ideal boilers can experience problems such as low pressure, ignition failure, circulation faults, unusual noises and repeated error codes. We repair Ideal boilers across London and diagnose the fault according to the symptoms shown by the appliance. This includes checking pumps, sensors, ignition components, valves and other parts where required.
If your Ideal boiler is switching off, failing to provide hot water or showing a fault code, we can arrange an engineer to inspect it. The repair depends on the cause of the problem, so components are tested before replacement wherever possible. After the work, the boiler and heating system are checked to make sure they are operating correctly.
Worcester Bosch Boiler Repair
Worcester Bosch boilers are fitted in many London homes, with faults varying between individual models and heating systems. We repair Worcester Bosch combi, system and regular boilers, dealing with issues such as ignition faults, pressure loss, leaking components, pump problems and boiler lockouts.
When a Worcester Bosch boiler stops working, our engineers first establish what is causing the failure rather than relying on repeated resets. They inspect the relevant components, carry out diagnostic checks and replace faulty parts where necessary. The boiler is then tested and recommissioned after the repair. If your Worcester Bosch boiler has stopped providing heating or hot water, we can arrange a repair visit in London.
Baxi Boiler Repair
Baxi boiler faults can affect heating, hot water or both, depending on the type of boiler and the failed component. Common problems can involve pressure loss, ignition, circulation, diverter valves, pumps and electronic controls. We repair Baxi boilers across London and investigate the cause before deciding what needs to be repaired or replaced.
Some faults may appear minor but can point to a larger problem within the heating system. Our engineers check the boiler and associated components to identify the source of the fault. Once the necessary repair has been carried out, they test the appliance and heating system to ensure it is working safely and correctly.
Corgi Boiler Repair
CORGI boilers can require repairs for a range of faults affecting ignition, heating, hot water and system pressure. We arrange boiler repair services across London for customers experiencing breakdowns, recurring faults or changes in boiler performance. Engineers inspect the appliance and heating system to determine whether the problem is mechanical, electrical or related to the system itself.
If your boiler is losing pressure, failing to ignite or repeatedly shutting down, a proper diagnosis is important before replacing any parts. The engineer will identify the faulty component, complete the required repair and test the boiler afterwards. This approach helps ensure the appliance is safe to use and the original fault has been properly addressed.
Combi Boiler Repair
A fault with a combi boiler can affect both your central heating and hot water because the appliance serves both functions. We repair combi boilers across London, including problems involving ignition, pressure, circulation, diverter valves, sensors, pumps and fault codes. Our engineers assess the symptoms and inspect the relevant parts before carrying out repairs.
Some combi boiler problems are straightforward, while others can be linked to the wider heating system. We therefore check the boiler alongside its connections and controls where necessary. Once the faulty component has been repaired or replaced, the system is tested to confirm that heating and hot water are operating as they should.
System Boiler Repair
System boilers work with a separate hot water cylinder, so a fault can affect either the boiler itself or another part of the heating system. We repair system boilers across London, dealing with problems such as low pressure, circulation faults, ignition issues, pump failures and inconsistent hot water.
When a system boiler stops working properly, we check the boiler alongside the cylinder, controls and associated pipework where necessary. This helps identify whether the fault is within the appliance or elsewhere in the heating system. Once the problem has been diagnosed, our engineers carry out the required repair and test the system to confirm that the heating and hot water are working correctly.
Local Boiler Repair Near Me
Local Boiler Repair Near Me
Even if you don't find your area above, we are expanding everywhere in Greater London, so call us we can help!
Frequently Asked Questions
How do I know if my boiler needs repairing?
There are a few clear signs that your boiler might need repairing. The most obvious one is when you have no heating or hot water, or the temperature keeps dropping for no reason. Another common issue is when the boiler keeps switching itself off or showing an error code on the display. Unusual noises like banging, gurgling or whistling can also mean there’s air trapped in the system, low water pressure, or a failing pump.
You might also notice the radiators aren’t heating evenly, or the boiler pressure keeps dropping below one bar. Leaks or puddles around the unit are another strong sign something’s wrong usually from a faulty seal, valve, or internal corrosion.
In short, if your boiler starts acting differently making noises, losing pressure, or giving inconsistent heating it’s time for a repair check. Catching issues early prevents bigger, more expensive damage later and keeps your system running efficiently and safely.
Do you offer emergency boiler repairs?
What types of boilers do you repair?
We repair all main types of boilers used in UK homes as: combi boilers, system boilers, and regular (conventional) boilers. Our engineers are trained and experienced with leading brands like Worcester Bosch, Vaillant, Ideal, Baxi and more.
Combi boilers are very common in London flats and smaller houses. They heat water directly from the mains, so when they fail, you usually lose both hot water and heating at once. We deal with issues like ignition failures, low pressure and faulty diverter valves on these units all the time.
System boilers and regular boilers are often found in larger properties with cylinders and water tanks. Repairs on these systems can involve pumps, valves, or expansion vessels. We also handle problems like leaking pipework or airlocks that stop hot water circulation.
Whether your boiler is modern or older, our engineers carry diagnostic tools to identify faults quickly and safely. We only use manufacturer-approved replacement parts to ensure reliability. In most cases, repairs can be completed the same day, provided no special parts are required.2
Is it safe to repair a gas boiler?
Gas boilers should only ever be repaired by Gas Safe registered engineers. It is not safe to attempt repairs yourself or to use someone who isn’t qualified. Gas systems can be dangerous if handled incorrectly, leading to gas leaks, carbon monoxide poisoning or even explosions.
A Gas Safe engineer is trained to work safely with gas appliances and understands how to isolate faults without risking your home’s safety. We check for leaks, test combustion levels and ensure the flue is venting properly before and after any repair.
During a professional repair, the engineer will inspect all safety controls, seals and connections to confirm the boiler is operating correctly. Once the work is complete, they’ll test the system and ensure it meets safety regulations.
If your boiler ever smells of gas, shows a yellow flame, or causes headaches or dizziness in the house, turn it off immediately, open windows and contact a Gas Safe engineer.
Keeping safety first means using only qualified professionals. It protects your home, ensures compliance with legal standards, and keeps your boiler warranty valid.
Get Your Boiler Back Up and Running.
Onsite Contractors and Plumbing Ltd. Registered office address: Apex House, 2nd Floor, Grand Arcade, London, England, N12 0EH, Company number : 09510946
