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Last updated: 5th April, 2024


Boiler Service London

Boiler Service London

Key takeaways

  • Boiler servicing in London in 2024 costs between £80 and £180, with an average of £100.
  • Regular servicing by a Gas Safe registered engineer ensures boiler safety and efficiency.
  • Selection of a competent service provider is vital for thorough maintenance and diagnostics.

A typical Annual Boiler Service includes a visual inspection to identify any obvious faults and testing of the appliance to ensure all components operate correctly.

Maintaining a boiler in London involves understanding the intricate details of the service process and costs for the year 2024. Servicing boilers is critical for ensuring they are running efficiently and safely. The cost of servicing a boiler in London typically ranges between £80 and £180, with an average cost sitting at around £100. 

This fee accounts for the expertise of a Gas Safe registered engineer who will conduct a comprehensive examination of the boiler, including the controls, pressure, and, importantly, the flue to prevent the emission of toxic fumes.

The servicing process is designed to identify any potential issues before they escalate into significant problems, thus ensuring the longevity and safety of the heating system. Factors such as the type of boiler, the complexity of the service, and the geographic location within London will influence the final price. 

Regular servicing can not only prevent costly repairs in the future but also maintains the efficiency of the boiler, which can lead to reduced energy bills. Choosing a reputable service provider who is equipped with the latest diagnostic tools is crucial for homeowners to ensure that their boilers are serviced correctly.

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Understanding Boiler Service:

A boiler service ensures the safety, efficiency, and longevity of your heating system. It’s a preventative step that involves a series of checks and cleaning procedures by a Gas Safe registered engineer.

Importance of Regular Maintenance

Regular maintenance of your boiler is essential for multiple reasons. Safety is paramount, as it can prevent deadly carbon monoxide leaks. Additionally, servicing helps maintain the efficiency of your boiler, which can lead to reduced energy bills. A periodic service also prolongs the lifespan of the boiler by detecting and mitigating wear before it leads to more significant problems, such as rust or corrosion.

What Does a Boiler Service Include?

A typical Annual Boiler Service includes a visual inspection to identify any obvious faults and testing of the appliance to ensure all components operate correctly. The engineer will check for leaks and corrosion, clean the boiler parts, and confirm that the boiler operates at the correct pressure. The service also involves a flue test to ensure no unsafe emissions are being released.

Recognising the Different Boiler Types

Understanding the different boiler types is crucial when considering service options. The varieties include Combi Boilers, which provide heat and hot water without the need for a separate tank; System Boilers, which work with a cylinder; and Conventional Boilers, which require both a cylinder and a tank. Electric Boilers are also available and have different servicing requirements due to the absence of gas combustion.

Identifying When Your Boiler Needs Service

Boilers should undergo an Annual Boiler Service to ensure they operate safely and efficiently. However, if you detect any irregularities like strange noises, water leaks, inconsistent heating, or a yellow instead of blue flame, these may indicate that a service is due immediately. A Gas Safe registered engineer should address these signs swiftly to prevent further damage or hazards.

2024 Costs for Boiler Servicing in London

Boiler servicing in London has a variable price range, largely depending on the type of service and location within the capital. As of 2024, regular boiler servicing for a typical residence is expected to cost between £100 and £150. This pricing takes into account the servicing of essential components including the main boiler unit, flue, burner, and oil filter.

  • For a standard gas boiler, homeowners may anticipate costs to fall within the range of £60 - £120.

  • Electric boilers, often involving less intricate servicing requirements, may see slightly lower fees ranging from £55 to £105.

  • The more cumbersome back boilers present greater challenges due to accessibility issues, which is reflected in service costs spanning £70 - £160.

Additionally, prices may surge if the service is sought as an emergency. In such cases, Londoners might encounter rates oscillating from £222 up to as high as £600. These figures underscore the importance of regular maintenance to circumvent the need for urgent repairs.

Residents should also consider the potential impact of existing boiler warranties or cover plans, which might influence the overall service costs. It is prudent for boiler owners to verify details with their providers before committing to service appointments.

Maintaining a boiler in efficient working order is not merely a financial consideration; it also ensures safety and operational reliability. Hence, despite the expenses, the regular servicing of boilers remains a necessary investment for London homeowners.

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Factors Affecting Boiler Service Cost

The cost of servicing a boiler in London can be influenced by various factors, from the type of boiler to the specific location within the city. Understanding these elements can help in anticipating the expenses involved.

Boiler Type

Different boilers require varying levels of maintenance. Combination boilers might incur different costs compared to regular boilers due to their design and functionality. A gas boiler service cost might differ from that of oil or electric boilers.

Boiler Age

An older boiler may result in higher service costs due to potential wear and tear. It may require more extensive checks and replacements of components, thereby increasing the labour and material costs.

Boiler Location and Safety

Servicing costs can escalate if a boiler is situated in a hard-to-access area or if additional safety measures must be taken. In properties where the boiler installation presents challenges, extra time and labour can drive up expenses.

Labour and Materials

Labour rates vary depending on the engineers' experience and location. Additionally, the price of materials needed for servicing may affect the overall cost. VAT must also be considered as part of the total service price.

Comparing Costs for Gas, Oil, and Electric Boiler Service

Overall, gas boiler service costs tend to be more affordable than servicing oil or electric boilers. This is due to the prevalence of gas boilers and the availability of qualified engineers.

Average London Boiler Service Cost

The average service cost for a boiler in London can range from £110-£120. This figure can vary significantly based on various factors, such as those mentioned above.

Most Expensive and Least Expensive London Postcodes

London's service costs fluctuate by postcode, with central areas generally commanding higher prices due to higher demand and operational costs in those regions.

London Boiler Service Cost vs National UK Regional Averages

London boiler servicing typically surpasses the national average due to the higher cost of living and labour charges. For comparison, servicing costs outside of London could be estimated at approximately £90-£120.

Servicing a boiler is essential for its efficiency and safety. It is recommended to factor in the aforementioned elements when budgeting for boiler maintenance in London.

The Service Process Explained

Obtaining a professional boiler service ensures that heating systems are operating efficiently and safely. The process involves a series of checks and tests conducted by a certified engineer.

Scheduling Your Service

To initiate a boiler service, homeowners should contact a reputable service provider. It's imperative to verify that the engineer is Gas Safe registered, a legal requirement for anyone working on gas appliances. The timing of the service, typically before winter sets in, can impact both the smooth operation of the boiler and the household's comfort during colder months.

What to Expect on Service Day

When the service day arrives, the engineer performs a methodical examination of the boiler. This commences with a visual inspection to identify any obvious signs of wear or damage. Following this, a comprehensive flue test is carried out to ensure no unsafe emissions are being released.

The engineer then examines the gas pressure and water pressure levels to confirm they are within the manufacturer's recommended guidelines. This step is essential for the boiler to function correctly and efficiently. During the visit, they will also assess the heating and hot water system's performance to ensure everything is in working order.

Gas safety checks form a crucial part of the service, which includes inspecting the boiler for gas leaks. Meanwhile, mains pressure is evaluated to safeguard against potential water supply issues that could affect the boiler's operation.

Should there be any concern, whether it's a minor issue or a need for necessary repairs, the engineer can advise on the most appropriate course of action to take. This might range from a simple adjustment to scheduling a follow-up repair appointment.

When engaging with boiler services in London, prioritising safety and adhering to legal duties is critical. This section explicates the importance of employing Gas Safe registered engineers and delineates landlords' responsibilities to uphold tenancy safety.

The Role of Gas Safe Registered Engineers

Gas Safe registration is a legal requirement for any engineer offering boiler services in the UK. These professionals have the necessary qualifications to ensure boiler installations and repairs are executed safely, minimising risks such as carbon monoxide poisoning and gas leaks. It's paramount for homeowners to verify an engineer's Gas Safe credentials before commissioning boiler work. This verification not only promotes safety but potentially safeguards against invalidating home insurance policies.

  • Checklist for Hiring Gas Safe Registered Engineers:

    • Ensure registration by checking the official Gas Safe Register online.

    • Request to see the engineer's Gas Safe ID card upon arrival.

    • Confirm their qualifications are relevant to the specific boiler work needed.

Understanding Landlord Responsibilities

Landlords in London have a clear legal obligation to ensure that all gas appliances, including boilers, are maintained in a safe condition. Annual gas safety checks must be performed by a Gas Safe registered engineer, and records of these checks are to be provided to tenants within 28 days of completion. This duty is not only a matter of compliance but also a precaution against potential liabilities and insurance claims.

  • Landlord Legal Requirements:

    • Conduct annual safety inspections and retain records for at least two years.

    • Equip properties with a functioning carbon monoxide detector.

    • Maintain breakdown cover in accordance with the terms set by insurance companies.

By heeding these guidelines, both engineers and landlords contribute significantly to maintaining a safe habitation environment, thus averting the adverse consequences of negligence.

Boiler Warranties and Insurance

Boiler warranties and insurance offer protection for homeowners, ensuring that boiler repairs and maintenance do not become an overwhelming concern. Most new boilers come with a manufacturer's warranty, which may range from one to ten years. It's critical to register the warranty promptly after installation and to adhere to the regular servicing requirements to keep it valid.

British Gas and other national firms provide boiler cover plans, which often include an annual service plan to help maintain the warranty. These plans can offer an invaluable peace of mind, shielding homeowners from unexpected costs and ensuring that any necessary repairs or maintenance are handled swiftly and professionally.

Boiler cover plans typically cover:

  • Emergency repairs: often with a 24/7 helpline.

  • Parts and labour: subject to the policy's terms and conditions.

  • Annual boiler service: to check and maintain the efficiency and safety of the boiler.

Here is how different cover options stand:

Cover Option

What’s Included

Annual Cost Estimate


Annual service

£60 - £100


Service + repairs

£150 - £250


Service + repairs + emergency call-outs

£200 - £400+

While warranties and insurance policies provide coverage, they may not always include every kind of fault or situation. Therefore, it’s prudent for homeowners to review policy details carefully.

The annual service plan is a keystone in maintaining both the warranty's validity and the efficiency of the boiler. Furthermore, it can help detect issues before they escalate, potentially saving on costly repair work down the line. By choosing a reputable provider, homeowners ensure their boiler remains in optimal condition for as long as possible.

Efficiency and Energy Saving

Routine servicing of your boiler is critical to maintaining its energy efficiency. An efficient service not only keeps the central heating system performing optimally but also reduces the likelihood of higher energy bills.

How Efficient Service Reduces Energy Bills

Proper maintenance of a boiler, especially for components with moving parts and heat exchangers, is essential. Regular servicing can prevent the accumulation of deposits and ensure that boilers function at maximum efficiency. A well-maintained boiler uses less fuel to generate the same amount of heat compared to a poorly maintained one, which can lead to a direct reduction in gas and electricity consumption. Servicing older boilers is particularly important, as their efficiency can diminish over time, which can result in increased utility bills.

  • Age of Your Boiler: Newer models operate with higher efficiency.

  • Moving Parts and Heat Exchangers: Regular servicing keeps these crucial parts in optimal condition.

Upgrading to Energy-Efficient Models

When servicing reveals that a boiler's efficiency is declining, it may be more economical to upgrade to a new, energy-efficient model. New boiler costs can appear daunting, but the investment usually pays off through lowered energy bills over time. For instance, converting to a condensing boiler, which uses less energy to produce heat, can offer significant savings. The upfront back boiler to combi conversion cost may be offset by the reduction in energy expenditure in subsequent years.

  • Condensing Boiler: Offers greater efficiency by recycling heat from exhaust gases.

  • New Boiler Costs: Higher initial expense but with long-term savings on energy bills.

Investing in a new central heating system translates to sustainability, both financially and environmentally, by reducing unnecessary energy usage.

Post-Service Considerations

After a boiler service, certain aspects demand attention to ensure the longevity and efficiency of the system.

Dealing with Boiler Faults Post-Service

In instances where faults, such as leaks or irregular noises, appear after the service, immediate action should be taken. Homeowners should consult the last service report to check for any advisories. Subsequently, contacting a Gas Safe registered engineer or an OFTEC certified professional, depending on the boiler fuel type, is vital. For complex issues or those involving expensive repairs, reviewing warranties and liaising with the boiler manufacturer or the brand's customer support can provide guidance. Regular faults with radiators or the boiler itself could be a signal that the system requires thorough assessment.

When to Consider a Boiler Replacement

Considering a boiler replacement becomes pertinent when necessary repairs become recurrent or financially burdensome. Longevity varies by boiler model and brand; a biomass boiler, for example, might have different endurance than a conventional gas boiler. Frequent and expensive repairs indicate that the system is likely beyond its prime. Households should evaluate the costs, taking into account their boiler's last service date and any manufacturer's guarantees. The decision should factor in newer models' efficiency levels and potential savings on energy bills. It is often more economical to invest in a new, efficient system rather than persistently repairing an outdated one.

Choosing a Boiler Service Provider

When selecting a boiler service provider, homeowners should weigh the benefits of local versus national firms and ensure they thoroughly compare quotes and services.

Local vs National Service Providers

Local service providers often boast a personal touch and may provide faster response times due to their proximity. National firms like British Gas have widespread recognition and may offer more extensive services due to their resources. When considering different boiler types, such as combination boilers or regular boilers, some local providers might hold specific expertise, especially with certain boiler manufacturers that are prevalent in the region.

  • Local Pros:

    • Personalised service

    • Potential for quicker service calls

  • Local Cons:

    • May have limited resources

  • National Pros:

    • Access to a broader range of services

    • Extensive support networks

  • National Cons:

    • Service may lack a personal touch

Comparing Quotes and Services

Homeowners should solicit quotes from multiple providers to compare costs for boiler service. It's important to ensure that the service includes an essential annual gas safety check, which reputable providers should include as standard practice. The cost varies; for instance, in London, expect to pay between £120 to £135 for a gas boiler service. However, the cheapest quote may not always equate to the best service.

  • Quote Comparison:


Average Cost (London)


Gas Boiler Service

£120 - £135

Annual safety check included

Oil Boiler Service

Not explicitly stated

LPG Boiler Service

Not explicitly stated

Note: Always verify that the engineer is Gas Safe registered, which is essential for both safety and compliance.

  • Service Comparison:

    • National firms may offer inclusive maintenance plans.

    • Local providers might be more flexible with appointment times.

In summary, it is advisable to balance factors such as cost, service quality, and responsiveness when choosing a boiler service provider. Whether opting for a local entity or a national organisation, the key is finding a qualified, reputable service that offers transparent pricing and conforms to UK safety standards.


At iHeat all of our subcontracted engineers are Gas Safe registered and can service your boiler swiftly and safely. Prices of an expert boiler service with iHeat start from £99.These figures might fluctuate regionally and can also depend on the specific type of boiler you own, such as a combi, gas, or oil boiler. 

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iHeat New Boiler Costs

Boilers can be a daunting purchase for many people as they’re an appliance with a lot of responsibility, providing heat for you and your family is something you want to get right. Boilers aren’t exactly a quickly disposable item either, potentially lasting you a decade.

Effectively, new boiler cost can be split into two segments: the first is the actual boiler itself (unit price), and the second is the cost of the boiler being installed (set up) in your property by an expert engineer. 

Here at iHeat, we want to remove all of this undue stress and make the decision making process of upgrading to a new central heating system, as easy as possible.

Boiler costs can vary depending on a number of factors including their brand, model, fuel, output, warranty, labour and installation type. Typically a new boiler will cost between £1,845 and £3,500, below is a list of average boiler installations offered by iHeat (guide only).

Installation Type

Price (inc VAT)

Combi to combi swap


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System to combi conversion


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New boiler install


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Back boiler to a combi


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System to system


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Frequently Asked Questions

How much is a boiler service in London?

The typical cost of a boiler service in London can range from £100 to £500, depending upon the complexity of the service required, the type of boiler, and the engineer's rates.

Can you outline the step-by-step process of a standard boiler service in London?

A boiler service usually involves an engineer carrying out a series of checks and tests. These include inspecting the boiler and controls, checking for leaks and issues, assessing operational pressure and/or heat input, and cleaning vital parts.

What factors influence the price of a Worcester Bosch boiler service in London?

Pricing for a Worcester Bosch boiler service in London depends on factors such as the model specifics, parts required, engineer experience, and the service's comprehensiveness.

How is the cost of an electric boiler service in London determined for 2024?

The cost of an electric boiler service in London is influenced by the electrician's rates, the boiler's condition, and any additional work, such as part replacements or repairs identified as necessary during the service.

Why do I need a boiler service in London?

Regular boiler servicing ensures the unit operates efficiently and safely, trimming down energy bills and reducing the risk of gas leaks or carbon monoxide issues.

How can one calculate the running costs of a boiler in London?

To calculate the running costs of a boiler in London, one should consider the boiler's efficiency, the cost of the energy source (gas, electric, etc.), the property's size, and the individual usage patterns.

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Article by
Stephen Day | Co-founder
Gas Safe registered and FGAS certified engineer with over 20 years experience in the heating and cooling industry.