Step 1
Contact Our Team
Call OnSite Contractors & Plumbing and tell us your boiler needs its annual service
Annual Boiler Service London
Need your boiler serviced for the year?
OnSite Contractors & Plumbing provides annual boiler servicing across Greater London for homes and businesses, with Gas Safe engineers available 24/7 and rapid attendance.
- Annual Boiler Servicing
- 40 Minutes Arrival
- Gas Safe Certified
- Holidays & Weekends
Annual Boiler Service
An annual boiler service gives you a proper check of the boiler before a small fault becomes a bigger problem. We inspect and test the boiler, check its operation and safety, and identify anything that needs attention.
Our annual gas boiler service is available for domestic properties, landlords and commercial premises across Greater London. If your boiler is due its yearly service, call us and arrange it directly. We provide 24/7 boiler servicing during weekends and holidays too, and aim for 40 minutes arrival anywhere you are located across Greater London.
Give us a call to arrange your annual boiler servicing in London today.
Our Annual Boiler Servicing Includes
Annual boiler servicing is more than switching the boiler on and confirming that it runs. As Gas Safe engineers, we inspect the boiler, test its operation and safety, and check the installation for issues that need attention.
Depending on the boiler and installation, an annual boiler service includes:
Visual checks for leaks, damage and wear
Gas flow, pressure and combustion checks
Flue and ventilation checks
Safety devices and boiler controls
Internal components and connections
System pressure checks and adjustment where needed
Condensate trap cleaning where required
A quick check of radiators and heating performance
The exact checks depend on the appliance and installation. If we find a fault, leak, pressure issue or worn component, we explain what needs attention and what work is required rather than leaving you guessing. Give us a call and arrange your annual gas boiler servicing today.
Why Keep Your Boiler Serviced Each Year?
An annual boiler service gives you a proper check of the boiler before faults turn into bigger heating problems. It us to identify safety issues, wear and performance problems early and deal with anything that needs attention.
Regular servicing can help with:
- Finding leaks, faults and worn components early
- Checking the boiler is operating safely and correctly
- Identifying combustion, pressure or flue problems
- Keeping the heating system running efficiently
- Reducing the risk of unexpected boiler breakdowns
- Keeping a clear record of regular boiler maintenance
- Save money by catching problems early and avoid costly repairs
If your boiler is due its annual service, don’t wait for a fault to appear. Call OnSite Contractors & Plumbing to arrange annual boiler servicing across Greater London.
10+ Years of experience
Local Service
Trusted & friendly
24/7 support
Our Process
Step 2
Book Your Appointment
We arrange a suitable appointment for your home, rental property or business across Greater London
Step 3
Boiler Service
One of our team's Gas Safe engineers attends, inspects the boiler and carries out the relevant operation and safety checks
Step 4
Fault Findings
If we find a fault or anything that needs attention, we explain the required work and can arrange the necessary repair separately
Boiler Brands We Service
We provide annual boiler servicing for a range of common boiler brands and types, including Vaillant, Ideal, Worcester Bosch, Baxi and CORGI. We service combi and system boilers for homes, landlords and businesses across Greater London.
If you have one of these boilers and it is due for an annual boiler service, our team of Gas Safe engineers can carry out the relevant checks on the appliance and installation and explain any issues that need attention.
If you are unsure whether we can service your particular boiler, call us with the make and model and we can discuss it with you.
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.
Boiler Servicing For Homes And Businesses
We provide annual boiler servicing for both domestic and commercial properties across Greater London.
That includes homeowners who want their boiler checked each year, landlords arranging regular maintenance and businesses that need their heating equipment kept in proper working order.
If the boiler needs repair during or after the service, we can discuss the required work with you separately. Our boiler repair service is available when a fault needs fixing. Give us a call.
Why Choose OnSite Contractors & Plumbing
Choosing the right company for an annual boiler service means having the boiler checked properly by qualified engineers who understand both heating systems and gas safety.
With OnSite Contractors & Plumbing, you get:
We’re available 24/7 to respond quickly, day or night. Holidays & Weekends.
We’re based nearby, which means faster response times and fair pricing with no hidden costs.
We reach you within 40 minutes for emergency call-outs, getting help to you fast when time matters most.
Gas Safe engineers carrying out the relevant boiler and safety checks.
Annual boiler servicing for homes, landlords and commercial properties
Positive customer reviews highlighting our professional service, quick response and clear communication.
Our annual boiler service is focused on checking the boiler properly, identifying issues that need attention and explaining any further work clearly. If your boiler is due for an annual boiler service London customers can arrange, call OnSite Contractors & Plumbing to book a visit.
Areas We Cover
24/7 Boiler & Heating Engineer
Even if you don’t find your area above, we are expanding everywhere in Greater London, so call us we can help!
Need An Annual Service? Call Us
Don’t leave your boiler service until there is a breakdown. If your boiler is due its annual service, call OnSite Contractors & Plumbing and arrange a visit.
We cover Greater London, operate 24/7 including weekends and holidays, and aim for approximately 40-minute attendance where applicable.
FAQ:
How often should I have my boiler serviced?
What does an annual boiler service include?
Do you provide annual boiler servicing for businesses?
What if you find a fault during the service?
Onsite Contractors and Plumbing Ltd. has been serving London for over 10 years.
We are a locally owned and operated business dedicated to customer satisfaction.
Over 70% of our work comes through referrals, reflecting the trust our customers place in us.
Whether you need plumbing, heating, or gas services, our experienced team is here to help.
Onsite Contractors and Plumbing Ltd. Registered office address: Apex House, 2nd Floor, Grand Arcade, London, England, N12 0EH, Company number : 09510946
