Boiler Repair Cost Guide 2025

To keep your boiler running efficiently and extend its lifespan, regular servicing and maintenance is a must. However, even with proper care, issues like pressure changes, leaks, or strange noises can occur. 

If your boiler is not working as it should, it’s time to call a Gas Safe or boiler repair specialist. 

How Much Does It Cost To Fix A Boiler 

While some repairs are simple and affordable, ignoring issues with your boiler can lead to more complex and costly problems down the line, so it’s important to address them as soon as possible.

In this guide, we’ll explain everything you need to know about boiler repairs, so let’s start by answering your most pressing question.

There is no definitive answer to this question, as the cost of boiler repair can vary depending on the type of boiler, the severity of the damage, the part of the boiler that is broken, and the company you hire to do the repairs.

However, you can expect to pay anywhere from £100 to £1,000 for boiler repair (which could mean it’s better to get a replacement boiler). Therefore, it’s important to get multiple quotes from different companies before making a final decision.

Average Boiler Repair Costs in the UK

Here’s a breakdown of typical boiler repair costs in the UK:

Type of repair	Price range (low-high)	Average cost
Boiler repair	£100 – £1000	£550
Emergency boiler repair	£200 – £700	£450
Gas engineer hourly rate	£10 – £100 plus the cost of repairs and parts	£55
Boiler insurance	£2.50 – £25 per month	£13.75
Standard boiler service	£60 – £130	£95
Thorough boiler service	£150 – £250	£200

Costs of Repairing Different Parts of a Boiler

Boilers are complex machines with various parts, and when problems arise, one or more parts might need to be replaced. Here’s how much it would typically cost you to replace the parts that get damaged most often. 

Boiler part	Average cost of the boiler part	Average cost of the boiler part + replacement
Boiler Air Vent	£35	£150
Overheating Thermostats	£55	£185
Boiler Fan	£200	£375
Gas Valve	£140	£300
Diverter Valve (Combi-Boilers)	£175	£375
Pressure Relief Valve	£65	£225
Water Pump	£140	£300
Printed Circuit Board	£250	£450
Heat Exchanger	£450	£750
Ignition System	£100	£250

What Factors Affect the Cost of Boiler Repairs

The cost of repairs can vary significantly based on the following factors:

Boiler Age, Type, and Size

Generally, it’s more expensive to repair older boilers. This is mainly because they usually require more extensive repairs, and it’s harder to find replacement parts for outdated models.

The type of boiler also affects the price because combi, system, and conventional boilers all have different complexity and repair requirements.

For example, combi boilers with more advanced technology can be more expensive to repair than simple conventional boilers.

The size of the boiler also matters when determining the price. Larger boilers usually have more expensive parts, and they take longer to repair, which increases labour costs.

Type of Repair

Minor repairs, like fixing a small leak or replacing an inexpensive part, usually come at a lower cost.

More complex issues, on the other hand, like repairing the heat exchanger or control board or replacing a more expensive part, require more time and expertise, increasing the costs.

Urgent repairs, especially those needed outside standard working hours, often come with premium charges.

This is particularly true when a Gas Safe registered engineer or boiler repair specialist is required on short notice. 

Boiler Cover/Warranty

Having a manufacturer’s warranty or a boiler cover plan can significantly reduce or eliminate repair costs. These plans typically cover the expenses for repairs and replacement parts. 

Your Location

Every area has different living costs, number of service providers, labour rates, and so on, all of which contribute to price variations.

For example, you may pay more for repairs in areas with higher living costs or fewer boiler repair services compared to regions with lower costs of living and more competition among service providers.

Is a Boiler Repair an Emergency?

A full boiler breakdown is definitely an emergency, as it causes a complete loss of heating or hot water.

Plumbing or damage failure (where internal flooding is caused) can also cause other damages, such as blocked drains, requiring an emergency repair. Another significant issue that should be urgently fixed includes gas or carbon monoxide leaks.

Some non-emergency boiler issues that can wait for your scheduled appointment include thermostat malfunctions, pressure fluctuations, and energy efficiency concerns.

What Signs to Look for When Your Boiler Needs to be Repaired?

Here’s a list of the most common warning signs that your boiler needs professional attention:

• Minor or significant leaks
• Odd smell coming from the boiler
• Unusual noises, like rattling, whistling, or rumbling sounds
• Inconsistent heating throughout your home
• Water temperature or pressure fluctuations
• Unusually high energy bills
• Fluctuating pilot light
• The boiler shutting off unexpectedly
• Corrosion or rust on the boiler or nearby pipes

Are Boiler Repairs Covered by My Home Insurance?

Most home insurance policies will not cover the cost of repairs if your boiler breaks down, especially if the boiler is old and needs to be replaced.

However, there might be some exceptions, like if your boiler gets damaged by an event that’s covered by your insurance, like a fire, flood, or theft. If your policy does cover the repairs, you might need to pay a deductible, which is a set amount you have to pay before your insurance policy kicks in.

If you’re not sure whether your home insurance policy covers boiler repairs, it’s best to give your insurance company a call to find out.

They’ll be able to give you the specifics of your policy and let you know what to expect if you need to file a claim.

How Long Does it Take to Repair a Boiler?

Repairing a boiler can take anywhere from one hour for minor issues to several days if specific parts or more complex repairs are required. 

For example, simple fixes like adjusting the thermostat or sealing small leaks usually take a couple of hours, while replacing parts that are readily available can be done within a day. More serious problems, like fixing a major leak or replacing the heat exchanger, can take an entire day or even several days if a specific part needs to be ordered.

Fixed-Price Repair and Time-Based Repair: What’s the Difference?

Some Gas Safe registered engineers or boiler repair specialists charge a fixed price for repairs, meaning the price is decided before the repairs start. It doesn’t matter how long the work takes or what parts are replaced – you pay the amount that’s agreed upon.

Service providers can also charge an hourly rate, meaning you pay for the time they spend repairing your boiler plus for any parts that need to be replaced. The time-based pricing model is more common for more complex boiler issues where the extent of the problem may not be immediately apparent.

What If My Boiler Can’t Be Repaired?

If your boiler cannot be repaired, your only option is to replace it with a new boiler.  A new boiler allows you to have faster-flowing hot water, more reliable technology, and most importantly, a better and more energy-efficient heating system for your home. Plus, it’s more cost-effective to have a new boiler than to maintain and repair an old one that breaks frequently.

There are many different types and models of boilers available on the market, so it’s important to research your options to find one that’s right for your home and needs. Here at GreenCentral, we have professionals on the phone ready to tell you which boiler is best for you, so reach out to get a quote.

Once you have decided on a replacement boiler, the company you choose will likely install it for you. However, it’s always a good idea to read the instructions carefully and familiarize yourself with the process before they arrive.

Can I Do a Boiler Repair at Home?

If your boiler starts making strange noises or isn’t working as efficiently as it used to, you might be tempted to try and repair it yourself. But before you start taking things apart, it’s important to know that boiler repairs can be dangerous and should only be performed by gas-safe registered engineers.

Attempting to repair your boiler at home can not only be dangerous, but it can also void your warranty and cause more damage to your boiler. If you’re not sure how to fix your boiler, the best course of action is to contact us. We will be able to quickly diagnose the problem and make the initial repair and maintenance.

Who Will Repair My Boiler?

If your boiler needs repairing, it’s important that you pick a qualified and experienced gas-safe heating engineer. This will ensure that they are legally allowed to carry out gas work in your home and that they can carry out the repair and maintenance of your boiler. 

We recommend choosing us to repair your boiler to save you any hassle. Simply answer a few simple questions about what seems to be the problem, and we’ll be on our way. There are no hidden costs, no call-out fees, and we don’t charge extra, especially for any one-off repair or ongoing maintenance. All services come at a fixed price.

How to Prevent Your Boiler From Costly Repairs in the Future?

Here are some tips that will potentially save you from costly repairs down the road.

Schedule annual boiler service

The most important thing you can do to extend your boiler’s lifespan is to ensure it’s serviced annually by a certified boiler professional. If there’s an issue with your boiler, these inspections will catch it early before it develops into a major and costly problem. 

Clean the filters

If you haven’t cleaned your boiler’s filters for over a year, they’ve probably accumulated dirt and other particles. Dirty filters make the boiler work harder, which can negatively impact its efficiency and lead to more frequent issues. One thing you can do to prevent this is to clean your boiler’s filters at least once a year. 

Check your boiler’s pressure

Boilers come with a pressure gauge that’s typically found on the front or just underneath the boiler. It should read between 1 and 1.5 bar or 2 in some boilers. 

If you notice that it’s below or above that, it means that there might be an issue with your heating system. Low pressure can lead to inefficient heating, while high pressure may cause leaks or damage to your system. If you notice pressure fluctuations, it’s best to contact a professional.

Bleed your radiators

If your radiators are heating unevenly, meaning some parts are colder than the rest, there’s likely air trapped inside some of the units. The trapped air build-up prevents the radiators from working efficiently, leading to higher costs and, eventually, a boiler breakdown. Check out our guide on how to bleed radiators to learn more.

Ensure proper ventilation

To keep your boiler running smoothly and prevent it from overheating, make sure it has enough room to breathe, especially if it’s installed in a small space like a kitchen cupboard. The proper room and airflow should be explained in the boiler manufacturer’s instructions. 

Why Should You Get a Boiler Service?

An annual boiler service is key to ensuring that your boiler is functioning properly and efficiently. Boiler servicing can identify any potential issues with your boiler early on so they can be fixed before they become major problems. This can extend the lifespan of your boiler and keep your energy bills down.

There are a number of reasons why you should get your boiler serviced on a regular basis. If you have any questions about boiler servicing or would like to book a service, please contact us today for any ongoing maintenance, future repairs, or a fixed-price boiler quote for the best prices.

FAQs

What is boiler repair?

Boiler repair is a process of troubleshooting and repairing a boiler to restore it to proper working condition. Some of the most common issues that lead to a need for repair or maintenance include:

• Leaks in the boiler
• A faulty pressure relief valve
• Faulty heat exchanger
• Worn-out gaskets or seals
• Faulty expansion vessel
• Limescale buildup
• Central heating sludge build-up
• Corrosion

If you are experiencing any of these problems with your boiler, it’s important to call our Gas Safe registered engineers as soon as possible. They will be able to diagnose the problem and make the initial repair and maintenance to get your boiler up and running again.

However, you could fix things like central heating sludge build-up by draining particular radiators yourself, as long as you isolate the problem beforehand.

What happens when a boiler breaks?

If your boiler breaks, it should be fixed as soon as possible, especially during cold weather. 

When your boiler loses heat and hot water, you can tell it has failed you. However, there are other causes of a broken boiler that should be brought to your attention. Please contact us if one of the issues below is causing your boiler to malfunction.

• A yellow or orange flame or pilot light – pilot lights are normally blue and clearly defined (look out for a pilot light that goes out every now and then).
• Loud clanking or banging noises.
• Frequent water pressure changes, tend to be too high.
• Excessive or high condensation in your room
• Increased gas usage (you may notice your gas bill or smart meter telling you that you spend more on gas than you usually do). This shows that your boiler isn’t working as efficiently as it should be.

If you are witnessing any of these signs, turn off your boiler immediately.

If your boiler is displaying an error code, you should write it down. This code can be useful to us or an engineer as we try and fix your boiler.

Please make sure your boiler is correctly supplied with water, electricity, and gas. Check if a gas appliance you already have, like an oven or hob, is working at your home. If not, you most likely have a gas supply problem, which can be fixed if you contact your gas transportation network.

What is the most expensive part of a boiler?

Gas boilers can have varying costs for their components, which depend on factors such as brand, model, and age. Generally, the most expensive part of a gas boiler is the heat exchanger, as it plays the main role in transferring heat from burning gas to circulating water for heating purposes. It typically costs anywhere between £300 and £600.

Heat exchangers can become damaged over time, leading to failures that are expensive to replace. Additionally, other costly parts of a gas boiler may include the burner, control module, and central heating pump.