Average Boiler Repair Costs From A Professional Plumbing And Heating Engineer

Boiler breakdowns are inconvenient, often stressful, and almost always come with unexpected costs. Understanding typical boiler repair costs in the UK can help you prepare financially and make informed decisions about repair versus replacement. 

Whether it’s a faulty diverter valve, leaking heat exchanger, or a full printed circuit board failure, the costs can vary significantly based on the parts required, the time of day, and the engineer’s experience. 

If you're dealing with a boiler issue and need fast, expert help, Maintracts Services is here for you. Our experienced plumbing and heating engineers provide prompt, professional repairs across London and beyond. Call us on 020 8682 2244 or email info@maintracts.co.uk for fast, reliable support. 

 

 

Understanding What Affects Boiler Repair Costs

Before diving into figures, it’s important to understand what influences average boiler repair costs. These variables can make one job relatively affordable and another significantly more expensive: 

• Type of fault – Common repairs like fixing a kettling issue will cost less than replacing a printed circuit board (PCB) or heat exchanger. 
• Age and condition – Older boilers are often out of warranty and may need pricier parts that are harder to source. 
• Availability of parts – Some components, like a gas valve or diverter valve, can be costly and hard to replace depending on boiler make and model. 
• Call-out timing – Emergency boiler repair costs outside standard hours are always higher. 
• Engineer experience – Choosing a certified Gas Safe engineer may cost more per hour but ensures compliance, safety, and quality workmanship. 

Also Read: Cost Of Plumbing Repairs 

 

Average Boiler Repair Cost Breakdown In The UK

Let's break down what homeowners can expect to pay for boiler repair costs across different scenarios.

1. Labour Charges

Most boiler engineers in the UK charge by the hour. The typical boiler engineer hourly rate ranges from £60 to £100 per hour, depending on location and experience.

For weekend or emergency jobs, that rate could rise to £120+ per hour, especially during peak winter months when heating breakdowns are more common.

2. Emergency Call-Out Fee

If you need help fast, be prepared to pay more. Emergency boiler repair cost in the UK typically includes a call-out charge between £100 and £200, plus hourly labour and parts. Some engineers offer flat rates for emergency services, but always confirm what's included in the call-out before agreeing.

3. Boiler Parts Repair Cost

The boiler parts repair cost makes up a significant portion of your bill. Here are typical replacement costs:

Part	Average Cost (inc. labour)
Diverter valve	£150–£350
Gas valve	£200–£400
Printed circuit board (PCB)	£250–£500
Heat exchanger	£400–£600
Boiler fan	£100–£250
Thermostat or timer	£90–£150
Minor leaks or pump issues	£100–£200

 

Each boiler model varies, so part compatibility and availability can push the cost up. If your boiler is still under warranty, you might only pay for labour.

4. Boiler Service Vs Repair Cost

Many homeowners overlook the value of annual servicing. A boiler service typically costs £80–£120, far less than most repairs. 

Preventative servicing helps catch small issues before they escalate. It also keeps your boiler under warranty, as many manufacturers require yearly checks. 

Also Read: Cost To Powerflush The Central Heating System In 2025 

 

Boiler Repair Vs Replacement: What’s More Cost-Effective?

Repairing an older boiler isn't always the most economical option. If you're frequently calling for repairs or facing a major part replacement, you may want to consider a full upgrade.

Here’s when to choose repair vs replacement:

Choose Repair If:

• The boiler is under 10 years old. 
• The fault is minor and inexpensive to fix. 
• The system is efficient and otherwise reliable. 

Choose Replacement If:

• Repair costs exceed £500–£800. 
• The boiler is over 15 years old and out of warranty. 
• Your system’s efficiency is poor, increasing energy bills. 

In some cases, a full replacement might cost just a few hundred pounds more than repairing a complex fault, especially if the parts are no longer available.  

Also Read: Boiler Installation Cost In The UK  

 

Get Expert Boiler Repairs With Maintracts Services

When boiler trouble strikes, you need fast, expert help from trusted professionals. At Maintracts Services, we offer responsive and reliable boiler repairs across London, always carried out by qualified, Gas Safe engineers. 

Whether it’s a leaking heat exchanger, a failed PCB, or an emergency breakdown in winter, we provide transparent pricing, high-quality repairs, and excellent service. 

We also advise on boiler repair vs replacement when the time comes, ensuring you make the best long-term decision for your home. Call us on 020 8682 2244 or email info@maintracts.co.uk for same-day assistance or to book a diagnostic inspection.