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Professional boiler repairs in London

Boilers are an integral part of our lives. They give us heat and hot water and help to make our houses homes. So, when one needs a repair, it’s a serious situation. And we know that it’s a situation that can’t wait. That’s why Just Boilers repairs systems all over London. 

Our team are expertly trained Gas Safe Engineers, and we will supply a precise and calculated repair service. All you need to do is ring up and let us know what the issue is. We will come out to your location, analyse the problem, and fix it as quickly as possible.

If you need an emergency boiler repair or a boiler breakdown in London, please don’t hesitate to call us immediately for our honest advice.


Charges are per hour with a one hour minimum charge

ServiceMon-Fri (8am-6pm)Out of Hours / Weekends
Boiler Repair£95.00+VAT£150.00+VAT
ServiceMon-Fri (8am-6pm)
Boiler Service£95.00+VAT
Gas Certificate£95.00+VAT
Power Flush (up to 4 radiators)£300.00+VAT then £35.00+VAT per additional Radiator
Landlord Gas Certificate & Boiler Service£130.00+VAT
ServiceMon-Fri (8am-6pm)
Wireless Programmable Room Thermostat£150+VAT + FITTING
Cylinder Thermostat£100+VAT + FITTING
Boiler Programmer£100+VAT + FITTING
Radiator Thermostats£30+VAT + FITTING
Radiators£100 - £200+VAT + FITTING
Boiler Performance Analyser Test£95+VAT
Boiler Fault Diagnostics Test£95+VAT
Central Heating Pumps£120 - £180+VAT + FITTING
2 and 3 Port valves Fitted£120 - £180+VAT + FITTING

We accept all major credit / debit cards. Payment on job completion.

Why Choose JustBoilers

GasSafe Registered

All our engineers are Gas Safe Registered

30 Years’ Experience

More than 30 years of experience in the boiler maintenance industry

No Call Out Charges

We offer fair, transparent pricing

Competitive Industry Rates

We have very competitive boiler installation prices

We offer Competitive, Honest Pricing and Value for Money

Whether your boiler is in need of an emergency repair or just a routine service, we understand how important it is to feel like you’re in great hands. We don’t believe in hidden costs – at, we only charge fair, honest prices for our services. We want to ensure you receive the best value for your money.

Our boiler repairs service provides…

So many engineers doing boiler repair services in London can’t wait to leave the property, rushing a job to get it done as quick as possible. As a customer, this can leave you with more problems down the line like more repairs, or even a complete breakdown.

At Just Boilers, we strive to make only one repair appointment. This is because we take our time, in order to deliver a permanent solution to your boiler issues. Our experts are dedicated to fixing any problem, big or small.

  • Whatever the issue, our professionals are equipped to handle it and restore your peace of mind.
  • We take the time to understand your issue by combining your description with our on-site observations. This ensures accurate repairs on the spot.
  • We won’t leave you in the cold. Before we leave, we work diligently to ensure your boiler is fully serviced and running smoothly, giving you peace of mind.

Common Boiler Repair Faults

There are some common issues we come across on a daily basis, that may indicate your boiler is in need of repair. If you think that your boiler is not functioning properly because of one of the below issues, please get in touch.

Providing your home with hot water and keeping yourselves warm is the primary reason for having a boiler. Unfortunately, there could be a lot of reasons for this to happen. Perhaps the pilot light isn’t on, the diaphragm is faulty, a valve has failed, there’s a leak in the central heating system, or even your thermostat isn’t set to an adequate temperature.

Central heating systems are complicated, for a radiator to not warm up there could be a couple problems. Firstly, there could be air in the radiator, which can be released by using a bleed key. Read our instructional article if you’d like to find out how to bleed a radiator. If there’s cold spots in the radiator, the system water could be dirty, which could need a powerflush to resolve. Radiator valves also could be a cause, which would need replacing.

London is notorious for having hard water, just look into your kettle and you’ll see the impact this has on your utilities. Kettling is where limescale builds up and causes issues to the boiler system and damage to the heat exchanger. To overcome this, it’s a scale reducer can be installed to remove the build up from the system, as well as a powerflush to clean the system.

Banging noises indicate that something is passing through the system, knocking as it goes along. This could range from debris, sludge and even air. Furthermore, scale build up and low water pressure can create banging and rattling noises.

The pilot light indicates that the boiler has fired up and trying to heat the water being passed through it. Perhaps there’s a broken thermocouple or the gas valve is faulty. Draughts can also blow the flame out if there is a break in the air seal. Lastly, there could be debris that is stopping the pilot light from firing properly and will need to be cleaned.

The majority of the time, if your boiler is losing pressure then it is from a leak in the central heating system. Beyond that, there could be an issue with the pressure relief valve or the expansion vessel.

If your heating system makes use of a condensate pipe that draws water away from the boiler, this can sometimes freeze. If this happens, often a blockage will occur and the boiler will fail.

As a thermostat gets older it can begin to fail and provide inaccurate temperature readings. If the thermostat can’t tell how warm it is, then it won’t be able to keep the room at a steady temperature, turning the boiler on and off at the wrong times.

Seals are the most common reasons for a boiler to have a leak. Over time they can get damaged and degrade, meaning water will eventually leak out – particularly under high pressure.

The boiler will switch itself off to avoid causing further damage and harm to the system, as well as other reasons. Low water pressure, air in the system, and a blocked condensate pipe can all cause this issue.


The length of the repair is completely dependent on the issue. But it can really help if you describe exactly what is wrong when we initially communicate. We wouldn’t want to give a precise time for a boiler repair job as every repair needs its own unique process.

Don’t worry if you can’t tell what’s wrong, just explain to us what you can see/hear from the boiler. We’ll figure out the rest upon arrival. We’re not expecting our customers to be boiler experts, otherwise they wouldn’t need us. Any information you can give us previous to our visit is very helpful.

We’ll always try to agree on a fixed price quote beforehand, but if that’s not possible, our rates work by the hour, with a one hour minimum charge and a fixed rate for certain services.

We offer competitive prices when compared to other London based boiler repair services. And don’t worry, we won’t charge extra for an emergency call-out!

A room thermostat maintains the constant temperature in a room or your house, and also regulates the temperature. It automatically switches on and off your heating system depending on what the surrounding temperature is.

A general boiler heats water and provides a house or building with hot water at any time. It does this by storing the heated water in a tank for use whenever the user is ready. Combi boilers  are smaller heaters that serve small houses and flats the best. They heat the water as and when it is needed, solving the old issue of ‘running out of hot water’.

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