Boiler Repair in Southampton

No heating, no hot water or a boiler showing an error code? Our Gas Safe registered engineers repair all makes and models of boiler across Southampton and the surrounding areas. We're accredited installers for Worcester Bosch, Vaillant, Viessmann and Glow-worm, so we know these boilers inside out, and we carry out repairs on every other major brand too.

Call us and we'll book you in at the earliest available appointment.

Gas Safe engineer repairing a boiler in Southampton

Boiler not working? Call us or send a message.

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Common boiler problems we fix

  • No heating or hot water. Often caused by a faulty diverter valve, pump, thermostat or a problem with the boiler's controls.
  • Low boiler pressure. If the pressure keeps dropping, there may be a leak in the system or a faulty pressure relief valve.
  • Boiler won't fire up. Ignition problems, a faulty gas valve or a blocked condensate pipe (common in freezing weather).
  • Error codes on the display. We diagnose the fault behind the code rather than just resetting the boiler.
  • Strange noises. Banging, gurgling or whistling can point to trapped air, sludge build-up or a failing pump.
  • Leaks and drips. Water under the boiler needs looking at quickly to prevent further damage.
  • Radiators not heating up properly. Cold spots usually mean sludge in the system, which a power flush can clear.

Many of these faults show up when the heating is switched back on after the summer, so it's worth booking a repair as soon as you notice a problem rather than waiting for the first cold night.

Boiler control panel with temperature display

Boiler brands we repair

We repair all major boiler brands, including Worcester Bosch, Vaillant, Viessmann, Glow-worm, Ideal, Baxi, Potterton and more.

Worcester Bosch logo
Vaillant logo
Viessmann logo
Glow-worm logo
Ideal Heating logo
Baxi logo
Potterton logo

As accredited installers for Worcester Bosch, Vaillant, Viessmann and Glow-worm, we're trained by the manufacturers and familiar with their parts and fault diagnostics.

We also repair oil and LPG boilers.

Repair prices

We keep our pricing simple and transparent:

If we can fix it on the first visit

£108 (£90 + VAT) for the call-out and the first hour of work

£27 (£22.50 + VAT) for every additional 15 minutes

plus the cost of any parts needed

If parts need to be ordered

£54 (£45 + VAT) for diagnosis and a written quote

Once you approve the quote, our engineer comes back with the right parts and completes the repair at the agreed price.

Either way, you'll know what you're paying before any work goes ahead. No surprises.

12 MONTH GUARANTEE

12-month guarantee on every repair

Every repair we carry out is guaranteed for 12 months, covering both parts and labour. If the same fault comes back within a year, we'll put it right at no extra cost.

What happens when you book a repair

  1. 1. Call or send us a message. Tell us what's happening with your boiler and we'll book the earliest available appointment.
  2. 2. Diagnosis. A Gas Safe engineer inspects your boiler, finds the cause of the fault and checks it's safe to use.
  3. 3. Clear quote. We explain the problem and the cost of the repair before starting any work.
  4. 4. Repair. Many common faults can be fixed on the first visit. If a part needs ordering, we'll let you know how long it will take.
  5. 5. Safety checks. Once repaired, we test the boiler to make sure it's running safely and efficiently.

Repair or replace?

If your boiler is old, keeps breaking down or parts are no longer available, a repair may not be the best value. We'll always give you honest advice. If replacing makes more sense, we can talk you through your options for a new, more efficient boiler.

To help prevent breakdowns in the first place, we recommend an annual boiler service.

Worcester Bosch boilers in white and black finishes

Areas we cover

We carry out boiler repairs across Southampton and nearby areas, including Shirley, Romsey, Totton, Hedge End, Eastleigh, Chandlers Ford, West End, Botley, Netley, Sarisbury, Marchwood, Holbury and Fawley.

We also cover Fareham, Portsmouth and Winchester.

Opening hours

Our office is open Monday to Friday, 9am to 5pm. Calls and messages outside these hours will be answered on the next working day.

Smell gas? Don't wait. Open windows, don't use electrical switches and call the National Gas Emergency Service free on 0800 111 999, 24 hours a day.

Boiler Repair FAQs

If we can fix the fault on the first visit, it's £108 including VAT for the call-out and first hour, then £27 for every additional 15 minutes, plus parts. If parts need ordering, diagnosis and a written quote cost £54 including VAT, and the repair is then carried out at the agreed price.

Yes. We repair all major brands, and we're accredited installers for Worcester Bosch, Vaillant, Viessmann and Glow-worm.

Yes. All our repairs come with a 12-month guarantee covering parts and labour.

We work Monday to Friday, 9am to 5pm, and we'll book you in at the earliest available appointment. If you smell gas, call the National Gas Emergency Service on 0800 111 999 straight away.

The most common causes are a small leak in the heating system, a faulty pressure relief valve or an expansion vessel that needs recharging. Our engineers can find the cause and fix it.

If your boiler is over 10 to 15 years old, breaks down regularly or needs an expensive part, replacing it may work out cheaper in the long run. We'll give you honest advice either way.

Frequently Asked Questions

If this happens, it might be a result of low pressure or blockage in the system, which is restricting the flow of water. In some cases, there could be a fault with a closed valve, thermostat or aa pump causing the water not to circulate properly. We recommend contacting us for assistance in diagnosing and repairing the fault by a Gas Safe registered engineer.
The most common causes of leaks and boiler dripping water are faulty internal components, this includes but is not limited to issues with corrosion, broken pressure valves, pump seals, or loosen pipe connections. We recommend calling out our Gas Safe registered engineer, who will diagnose and fix the problem for you and stop any potential dangers. You should never try to fix a boiler yourself, always call out for professional help.
Kettling sound from your boiler ( similar to a boiling kettle ) is usually caused by limescale or sludge buildup inside the system. It often happens in areas with hard water. The deposits build up in your boiler or pipes can block or restrict the flow of water inside the system, which can result in overheating and weird noise. It is best to treat this as soon as possible because it might result in more severe boiler damage and higher costs if your boiler needs replacing. We recommended calling our team as soon as you notice kettling sounds from your boiler. Our engineer will drain your central heating system and remove limescale and sludge buildup. For more information on this method, please visit our Power Flush section.
Worrying noises from the boiler are usually caused by low water pressure, a faulty pump or air buildup in the system. The type of sound in your system can narrow down the source of the problem. Banging noise could be a result of imminent pump failure, and this happens most often in old systems that have not been serviced regularly. We highly recommend contacting us to book our Gas Safe registered engineer for a professional diagnose of the problem as soon as possible.
The blue flame that always stays lit is called a pilot light. If this pilot light keeps turning off, it will stop your boiler from working. It can be caused by a broken thermocouple, which would stop the supply of gas to your boiler. Sometimes also the problem could be a draught blowing the pilot light out or a deposit built up in the pilot light. Always remember that you should never carry out any work on your central heating system. There is one thing that you could check yourself before calling out an engineer: Check if your other gas appliances are working and that your gas stopcock is on. You can always give us a call, and we will be more than happy to help you.
The most common causes for this to happen are faulty airlocks, diaphragms, motorised valves, thermostat or low level of water in the system. Your heating system might require a new part fitted to be working correctly again. Give us a call today for professional advice. If necessary, we will book a Gas Safe registered engineer for a professional diagnose of the problem as soon as possible.
It is straightforward to check the pressure of your central heating system; just take a look at the pressure gauge on your boiler. Low pressure ( below 1 ) will cause your central heating system not to work properly. It can be a result of a few potential reasons. Some of the reasons for this to happen could be a water leak in the system, recently bled radiators or a faulty pressure relief valve. We recommend contacting us for assistance.
All condensing boilers ( combi, system or regular ) have a condensate pipe transporting excess water away from the boiler. During winter it is common for the water to freeze and cause a blockage. If this happens, your boiler will most probably display a warning or a fault code. Feel free to give us a call; we will be happy to assist.
It might be a sign of a faulty thermostat when the heating is turning on and off when it is not supposed to. If your thermostat starts to malfunction or loses its accuracy, it will probably need to be replaced. Give us a call today for professional advice.
If some of your radiators are not getting hot, then they might need balancing. This procedure can also be done without the help of an engineer, but only if you feel confident doing it. If only the bottom of your radiator is getting hot then it might need to be bled, it is not a difficult task, and it does not require an engineer. In some other cases, there could be a build-up of sludge or air in your central heating system. Our professional engineers can remove this build-up by a process called Power Flush, and this is something that you should not try yourself.
All of our installers are fully trained, and qualified Gas Safe registered professionals.
We will recommend the best possible boiler for your needs, in terms of brands we mostly recommend Valliant and Worcester Bosch.
Harrison Heating has a team of professional engineers covering all of Hampshire. Most of our work so far has been carried out in the following areas: Southampton, Eastleigh, Fareham, Chandlers Ford, Whiteley, Winchester, Portsmouth, Winchester, Hedge End, West End, Botley, Romsey, Totton, Lyndhurst, New Forest, Hythe, Marchwood, Netley, Gosport, Twyford, Hamble, Holbury, Wickham, Titchfield, Nursling, Ringwood, Salisbury, Cosham, Waterlooville, Fair Oak and Lee-on-the-Solent.
Yes, we provide free quotes without obligation from your side to accept our quotation.
To give you the best and optimal solution we will need to know few details. For example, we will ask how many rooms and bathrooms you have currently or if you are planning any future extensions of your house.
In most cases, we can install your new boiler in the next working day. It depends on the current workload, so please give us a call as soon as possible if you are in a rush.
It usually takes one day to fit a new boiler by our professional installation team.
It is required by law that all servicing and gas safety checks are made by a Gas Safe registered engineer. It is also a condition of the warranty if your boiler is still under one.
We will do all possible safety checks, inspection and test all critical components to make sure your boiler runs safely, reliably and efficiently.
Please feel free to use our website to leave us a short feedback message. We are always happy to hear from customers about the outcome of our work. You can also read other customers reviews in the feedback section of our website.
Underfloor heating can be installed in most houses under almost any type of flooring. It gives you the option to have different zones heated and controlled independently. It comes very convenient in terms of managing heat distribution depend on which rooms are being used at the time.
Of course, you can! It is even recommended if the room is big enough, the area of heating can be split into sections. This approach works great with open-plan areas like kitchen diners.
Underfloor heating gives you the ability to warm up naturally cold ceramic or stone floors efficiently. It distributes the heat throughout the heated areas more equally compared to the radiators. Once installed, the underfloor heating requires less maintenance compared to central heating.
The underfloor heating gives you more control, increased comfort, better heat distribution, and it costs less to run. Underfloor heating provides a cleaner radiant heat causing less discomfort to asthma and dust allergies sufferers.