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Last updated: 22nd March, 2024


How Long Does a Boiler Service Take?

How Long Does a Boiler Service Take?

Key takeaways

  • Boiler service duration ranges from 30 minutes to 2 hours, depending on various factors.
  • Regular maintenance is essential for maintaining efficiency and safety.
  • Always use a Gas Safe registered engineer to complete your boiler service.

A boiler service is an important part of boiler maintenance, helping to ensure that your heating system is working safely and efficiently. But many homeowners are unsure about how long a boiler service typically takes.

Boiler servicing is an essential annual task to ensure the smooth and safe operation of your home's heating system. 

The process involves a thorough inspection, cleaning, and performance assessment by a qualified technician. 

While the actual duration of a boiler service may vary, it typically takes anywhere between 30 minutes and 2 hours, depending on factors such as the type, age, and condition of the boiler.

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Understanding the specifics of a boiler service can help homeowners appreciate the importance of regular maintenance. 

Without proper care, boilers can become less efficient, potentially leading to higher heating bills and even safety issues. 

To ensure optimal performance and safety, it is crucial to hire a Gas Safe registered engineer to carry out the service.

What is a Boiler Service?

A boiler service is an essential aspect of maintaining your home's heating system, providing homeowners with peace of mind that their boiler is functioning effectively and safely. 

Generally conducted annually, a boiler service involves a Gas Safe registered engineer thoroughly inspecting, cleaning, and tuning the boiler to ensure optimal performance.

During a boiler service, the engineer will work on various components of the system, checking to rectify any issues and to maintain efficiency. Key tasks include examining the flue for blockages and leaks, evaluating the gas pressure, and inspecting the main boiler components such as the heat exchanger, burner, and controls. 

This careful examination reveals any faults or wear and tear, allowing the engineer to address them before they escalate into more serious problems.

For homeowners, scheduling regular boiler services is a wise decision as it helps in prolonging the boiler's lifespan. Additionally, it ensures safety by detecting potential carbon monoxide leaks and enhances the energy efficiency of the heating system. 

A well-serviced and maintained boiler reduces the likelihood of unexpected breakdowns and costly repairs in the long run.

While the duration of a boiler service may vary depending on factors such as the type, age, and complexity of your boiler, it typically takes between 30 minutes and 2 hours to complete. 

It is crucial to choose a reliable and professional service provider, as a comprehensive and thorough boiler service not only keeps the system running smoothly but also contributes to reduced energy bills and a safer home environment.

Why is Regular Maintenance Essential?

Regular maintenance of a boiler is crucial for several reasons, including efficiency, safety, and the overall longevity of the heating system. 

By conducting regular boiler services, homeowners and businesses can ensure that their heating system operates at peak performance while reducing the likelihood of breakdowns or costly repairs.

One key aspect of regular maintenance is ensuring efficiency. A properly serviced boiler will operate more efficiently, consuming less fuel and producing the desired heat output. 

This not only saves money on energy bills but also reduces the environmental impact. Furthermore, efficient boilers are less prone to wear and tear, extending their lifespan.

Safety is another vital factor in regular maintenance. Boilers contain several components that, if not regularly inspected and maintained, can pose a risk to both the property and its occupants. For instance, a faulty component may lead to a gas leak or even carbon monoxide poisoning. 

During a boiler service, a Gas Safe registered engineer will carefully inspect all components, ensuring that they are in perfect working order and identifying any potential hazards before they become severe issues.

A thorough boiler service also includes cleaning and, if necessary, replacing various components within the heating system. This process ensures optimal functioning by reducing the buildup of dirt and debris, which can cause blockages or impede the system's performance. 

By maintaining all components in good condition, the heating system will remain reliable and effective.

Lastly, a regular service report is essential for maintaining an accurate record of the boiler's condition and any repairs or maintenance performed over time. This documentation can prove invaluable when troubleshooting issues, as it provides a clear history of the heating system and its components. Additionally, maintaining a consistent service history may be a requirement for warranty purposes or when selling the property.

In conclusion, regular maintenance of a boiler is paramount for maintaining efficiency, safety, and reliability. A well-maintained heating system will save money in the long run, provide a comfortable environment, and ensure the safety of its occupants.

Understanding the Boiler Servicing Process

Visual Inspection and Safety Checks

A heating engineer initiates the boiler servicing process with a visual inspection and various safety checks. They ensure that the boiler and its surroundings adhere to the Gas Safe Register guidelines, with appropriate clearances and ventilation. This step also involves examining any external visible signs of damage or wear.

Component and Leak Inspection

Next, the engineer inspects the boiler's components for potential leaks and issues, focusing on the heat exchanger, combustion chamber, and other vital parts. 

This inspection helps detect any possible corrosion, obstructions, or faulty components that might hinder your boiler's functionality and safety. If any leaks are detected, the engineer takes necessary action to address them.

Cleaning and Repairs

Once the visual inspection and safety checks are complete, the engineer proceeds to clean the boiler components. This step involves removing any debris or dust that might impede the boiler's efficiency or lead to malfunctions. 

If required, they carry out repairs or replacements to ensure that your boiler functions optimally and safely.

Flue Check and Gas Safety

The flue check is crucial, as it verifies that the boiler's combustion exhaust gases are being safely expelled from your home. The engineer checks for any potential obstructions or issues within the flue system and ensures it meets the required gas safety standards. 

They may also test the boiler's components, such as the flame and controls, to ensure the boiler is operating within safe parameters.

Efficiency Check and Final Reporting

Lastly, the engineer evaluates your boiler's efficiency by assessing its controls and safety devices. They check that the boiler is functioning within the recommended energy efficiency guidelines laid out by organisations such as the Energy Saving Trust. After completing all the required checks, tests, and repairs, the engineer provides a service report detailing their findings and any maintenance or corrective actions taken during the service.

By following these steps, a Gas Safe registered engineer can ensure that your annual boiler service is thorough and comprehensive, keeping your home heating system running smoothly and safely.

Boiler Types and Their Service Duration

When discussing boiler servicing, it's essential to consider that the duration of a service can vary depending on the type of boiler. 

In this section, we'll explore the three primary types of boilers, their respective servicing durations and what factors might influence the time spent on servicing each of them.

Combi Boiler

Combi boilers are a popular choice in many homes due to their compact size and ability to provide hot water on demand. The typical boiler service for a combi boiler takes around 30 minutes to 1 hour. Factors influencing the service duration may include the boiler's age, condition, and make and model. 

When the boiler is relatively new and well-maintained, its service might be quicker, while older or poorly maintained boilers might necessitate more time for thorough inspections and cleaning.

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System Boiler

A system boiler is designed to work with a separate hot water storage cylinder, providing central heating and hot water to the home. The boiler service duration for a system boiler can range from 30 minutes to 2 hours, depending on its condition, make and model, and the complexity of the system. 

Like combi boilers, newer and well-maintained system boilers may require less time during servicing. In contrast, older models or those that have been neglected may take longer to inspect, clean and perform any necessary repairs.

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Heat-Only Boiler

Heat-only boilers, also known as conventional or regular boilers, provide heating to the home through a separate hot water storage cylinder and cold water storage tank. These boilers may require a slightly longer service duration compared to combi and system boilers. A heat-only boiler's service might take anywhere from 30 minutes to 2 hours, depending on factors like the boiler's age, manufacturer and model, and overall condition. 

As with the other two types of boilers, a well-maintained heat-only boiler might require less time for servicing, while older or neglected models may take longer to ensure their safe and efficient operation.

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In conclusion, various factors affect the boiler service duration, including boiler type and its age and condition. Regular maintenance can help shorten this time and ensure your boiler works safely and efficiently, regardless of which type of boiler you have.

Cost of Boiler Service

The cost of a boiler service in the UK can vary, but typically, you should expect to pay between £70 and £100, or £200-£300 for more thorough packages. This range can be attributed to factors such as the type and age of the boiler, as well as the service provider you choose. 

When considering the overall expenses, it is crucial also to factor in the potential savings on your heating bills. An efficiently maintained boiler can save you up to £840 per year, proving that yearly boiler services are indeed worthwhile investments.

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When it comes to boiler maintenance and servicing, landlords have specific legal obligations. Under the Landlord and Tenant Act 1985, landlords must ensure that installations supplying water, gas, and electricity are in good working order. This includes both space and water heating systems. In the UK, annual boiler servicing is a legal requirement for landlords.

By law, landlords need to employ registered engineers to carry out the necessary maintenance tasks on gas appliances. This is where the Gas Safe Register comes into play. Landlords must ensure that a Gas Safe registered engineer conducts the boiler service. For oil-fired boilers, landlords should seek the assistance of an OFTEC registered technician.

In order to comply with the law and ensure tenant safety, landlords should arrange an annual boiler service. This not only guarantees the boiler's efficient operation but also prevents potentially dangerous issues such as carbon monoxide leaks. The servicing should be done in accordance with the manufacturer's guidance, and it is the landlord's responsibility to maintain records of the service for at least two years.

The boiler service typically takes between 45 minutes to an hour. During the service, a thorough inspection of the boiler's components is carried out to ensure optimal performance and safety. Landlords should provide their tenants with a copy of the gas safety certificate, highlighting the results of the service.

In conclusion, landlords must adhere to various legal requirements and fulfil their obligations when it comes to boiler servicing. By hiring registered engineers from the Gas Safe Register or OFTEC and scheduling regular services, landlords will maintain a high level of safety and efficiency in their rented properties.

Guarantees, Warranties and Contracts

When it comes to boiler servicing, understanding the role of guarantees, warranties, and contracts is crucial. These elements serve to ensure the longevity and optimal performance of your boiler system, protecting both your investment and home's comfort.

Warranties usually come into effect upon the installation of a new boiler. The duration of a boiler warranty can vary widely, ranging from 1 to 10 years. 

While modern boilers are indeed highly reliable, obtaining a warranty is still advisable to protect against unforeseen malfunctions or performance drops. Regular servicing is often required to maintain the validity of the boiler warranty. For example, you should typically get a boiler service 12 months after its installation to meet the terms of the warranty.

Besides warranties, boiler servicing contracts can provide homeowners with additional peace of mind. These contracts often include an annual boiler service, ongoing maintenance, and access to a 24/7 helpline. 

Costs for such contracts can vary, but an example would be £252 per year (with a £0 call-out fee) for an annual contract. Some contracts may even include a replacement boiler worth up to £750, if required.

It is essential to carefully review the terms and conditions of any warranty or contract to ensure you fully understand the coverage provided, as well as any exclusions or special clauses. In some instances, neglecting regular boiler servicing may invalidate the warranty, whereas other contracts may require the homeowner to comply with specific maintenance guidelines.

Lastly, always ensure that the professional servicing your boiler is a Gas Safe registered engineer. 

By doing so, you guarantee their expertise in addressing any boiler issues while abiding by industry standards and safety regulations. In conclusion, understanding the guarantees, warranties, and contracts related to your boiler system will ensure you get the most out of your investment while maintaining safety and efficiency.

Tips to Avoid Costly Repairs

In order to prevent costly repairs and ensure that your boiler and radiators function efficiently, consider the following tips:

  1. Annual boiler servicing: Scheduling a boiler service by a qualified engineer at least once a year plays a crucial role in maintaining your boiler's performance and detecting any issues before they escalate. A typical boiler service takes between 30 minutes and 2 hours, depending on factors such as the type and age of your boiler. By regularly servicing your boiler, you can avoid unexpected breakdowns and maximise its efficiency, ultimately saving money on your heating bills.

  2. Use a professional: Trusting your boiler's maintenance to a qualified engineer is essential for avoiding costly mistakes or damages caused by unqualified individuals. A reliable professional can properly assess your boiler's condition and recommend appropriate actions, ensuring the longevity of your heating system.

  3. Regularly check your radiators: Examine your radiators for any cold spots or uneven heating, as this could indicate a buildup of sludge or air trapped in the system. Bleeding your radiators and adding a central heating inhibitor can help remove these issues and optimise your heating efficiency.

  4. Monitor and maintain the boiler pressure: Keep a close eye on your boiler's pressure gauge to ensure it operates within the recommended range. Fluctuations in pressure can cause wear and tear on your boiler system, leading to costly repairs. If you notice any significant changes, contact a qualified engineer to address the issue promptly.

  5. Timely upgrades: If your boiler is old or in poor condition, consider replacing it with a new, energy-efficient model. While the initial investment may be high, a modern boiler can save you money in the long run by reducing energy consumption and minimising repair costs.

By taking these steps, you can maintain your boiler and heating system in optimal condition, reducing both the risk of costly repairs and the impact on your wallet. Remember, a well-maintained boiler is a reliable and energy-efficient investment for your home.

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.

Boiler costs 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.

Boiler Cost Guide Prices

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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Some location factors that can influence the price of your new boiler

You will be given a specific quote from the boiler installation company based on:

The type of home you have (i.e. terraced, semi-detached, etc.)

  • How many bedrooms you have

  • How many bathrooms you have

  • Your postcode and specific location

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Frequently Asked Questions

How much does it cost to get a boiler serviced?

The cost of getting a boiler serviced can vary depending on factors such as your location, the type of boiler you have, and the engineer's fees. On average, you can expect to pay between £50-£100 for a standard boiler service. It's essential to shop around and obtain quotes from different service providers to ensure you get the best value for your money.

What should I expect from a boiler service?

During a boiler service, a Gas Safe registered engineer will inspect and test various components of your boiler to ensure it is operating safely and efficiently. This process includes checking for any leaks or corrosion, examining the seals and gaskets, and testing the flue system for proper ventilation. The engineer will also clean the boiler's heat exchanger and burner if needed.

How long does it take a boiler to be serviced?

The duration of a boiler service can vary depending on several factors, such as the type and age of the boiler. Generally, a boiler service takes between 30 minutes and 2 hours. However, older boilers or those requiring additional work may take longer to be serviced.

How often should a boiler be serviced?

It's recommended that you have your boiler serviced annually to keep it running efficiently and safely. Regular servicing can help prevent potential issues, prolong the life of your boiler, and save you money on energy bills and future repair costs.

How long does a gas boiler service take?

A gas boiler service typically takes around 20-40 minutes to complete, depending on various factors such as the boiler's condition and age. However, it can take up to 1.5 hours for older boilers that require more work.

How long should a service take on a gas boiler?

Similar to the previous question, the service time for a gas boiler typically ranges from 20-40 minutes. This duration can extend to 1.5 hours, especially for older boilers or those needing extra attention.

Do they check radiators on a boiler service?

During a boiler service, the primary focus is on the boiler itself. However, some engineers may also check the radiators for any leaks, blockages, or air trapped inside. It's always a good idea to discuss your needs with your chosen engineer ahead of time to ensure they can address any concerns related to your radiators during the service.

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